Relevant bibliographies by topics / Anterior ocular segment

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  1. Journal articles
  2. Dissertations / Theses
  3. Books
  4. Book chapters
  5. Conference papers

Academic literature on the topic 'Anterior ocular segment'

Author: Grafiati
Published: 4 June 2021
Last updated: 17 February 2022

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Journal articles on the topic "Anterior ocular segment"

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Tabbara, Khalid F. "Ocular Tuberculosis: Anterior Segment." International Ophthalmology Clinics 45, no. 2 (2005): 57–69. http://dx.doi.org/10.1097/01.iio.0000155935.60213.ac.

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Ryan, Denise S., Rose K. Sia, Marcus Colyer, et al. "Anterior Segment Imaging in Combat Ocular Trauma." Journal of Ophthalmology 2013 (2013): 1–8. http://dx.doi.org/10.1155/2013/308259.

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Purpose. To evaluate the use of ocular imaging to enhance management and diagnosis of war-related anterior segment ocular injuries.Methods. This study was a prospective observational case series from an ongoing IRB-approved combat ocular trauma tracking study. Subjects with anterior segment ocular injury were imaged, when possible, using anterior segment optical coherence tomography (AS-OCT), confocal microscopy (CM), and slit lamp biomicroscopy.Results. Images captured from participants with combat ocular trauma on different systems provided comprehensive and alternate views of anterior segment injury to investigators.Conclusion. In combat-related trauma of the anterior segment, adjunct image acquisition enhances slit lamp examination and enables real timeIn vivoobservation of the cornea facilitating injury characterization, progression, and management.
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Hersh, Peter S., and Kenneth R. Kenyon. "ANTERIOR SEGMENT RECONSTRUCTION FOLLOWING OCULAR TRAUMA." International Ophthalmology Clinics 28, no. 1 (1988): 57–68. http://dx.doi.org/10.1097/00004397-198802810-00009.

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Morrison, John C., Wolf H. Fahrenbach, David R. Bacon, David J. Wilson, and E. Michael Van Buskirk. "Microvasculature of the ocular anterior segment." Microscopy Research and Technique 33, no. 6 (1996): 480–89. http://dx.doi.org/10.1002/(sici)1097-0029(19960415)33:6<480::aid-jemt2>3.0.co;2-p.

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Goldich, Yakov, Michael Cooper, Yaniv Barkana, et al. "Ocular anterior segment changes in pregnancy." Journal of Cataract & Refractive Surgery 40, no. 11 (2014): 1868–71. http://dx.doi.org/10.1016/j.jcrs.2014.02.042.

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Cortez, Maria A., Gian P. Giuliari, Luis Escaf, Sonia Escaf, and Claudia Vidal. "Ocular cysticercosis of the anterior segment." Journal of American Association for Pediatric Ophthalmology and Strabismus 11, no. 6 (2007): 628–29. http://dx.doi.org/10.1016/j.jaapos.2007.07.003.

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Fabrikantov, O. L., S. I. Nikolashin, and E. S. Pirogova. "Diagnostic Value of Modern Methods of Ocular Anterior Segment Visualization in Intumescent Cataract." Ophthalmology in Russia 16, no. 3 (2019): 350–54. http://dx.doi.org/10.18008/1816-5095-2019-3-350-354.

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Purpose: tо evaluate the diagnostic capabilities of optical coherence tomography (OCT), Scheimpflug camera and ultrasound biomicroscopy (UBM) in examining topography of the ocular anterior segment and lens in mature intumescent cataract. Patients and methods. 23 eyes with mature intumescent cataract were examined using OCT (RTVue-100, Optovue, USA), Scheimpflug camera (Pentacam HR, Oculus, Germany) and UBM (UD 8000, Tomey, Japan). We examined the anterior chamber depth, profile and magnitude of the anterior chamber angle, distance “trabecula-iris at 500 microns”, thickness of the liquid lenticular mass layer, lens thickness, Zinn ligament length within four segments, equatorial angle. Results. We managed to measure the anterior chamber depth using UBM and Scheimpflug camera. UBM measurement was 1.96 ± 0.14 mm, Scheimpflug camera — 1.91 ± 0.11 mm. We revealed narrowing of the anterior chamber angle up to 11.54 ± 2.19° in UMB examination, to 11.49 ± 2.17° in OCT measuring and to 11.63 ± 2.21° in examining by Scheimpflug camera. Distance “trabecula-iris 500” was 0.212 ± 0.037 mm in UMB examination, 0.218 ± 0.042 mm — by means of OCT, Scheimpflug camera measurement was unsuccessful. The rest parameters were examined only by UBM. The lens thickness was 5.26 ± 0.13 mm. The anterior layer of liquid lenticular mass was 0.85 ± 0.06 mm. Zinn ligament length in the outer segment was 0.708 ± 0.072 mm, in the internal segment — 0.731 ± 0.089 mm, in the superior segment — 0.704 ± 0.084 mm, in the inferior segment — 0.876 ± 0.089 mm. The equatorial angle in two opposite segments was 32.52 ± 0.92°. Conclusion. Ultrasound biomicroscopy has the biggest value in examining topography of the ocular anterior segment and lens in mature intumescent cataract, since only this method allows achieving the whole complex of data necessary to evaluate the swelling lens parameters. This can serve as a basis for developing the appropriate tactics of surgical intervention.
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Nguyen, Quang Le, Samuel Benjamin Reynolds, Niloofar Piri, and Hiram L. Rivas Perez. "Ophthalmic anterior segment metastasis masquerading as uveitis." BMJ Case Reports 14, no. 3 (2021): e236405. http://dx.doi.org/10.1136/bcr-2020-236405.

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Ocular malignancies are rare, with many cancers of the eye being the result of metastases, the most common of which result from primary tumours of breast, lung and gastrointestinal tract. Diagnosis is often made at a late stage in the disease course, leading to poorer outcomes. Disease-directed therapy in the presence of ocular metastases varies based on the primary tumour and patient performance status but generally involves systemic treatment, either with chemotherapy or involved-field radiation. We herein present an interesting case of ocular malignancy with neuroendocrine small cell features of pulmonary origin in a patient with no prior oncological history. Meticulous ophthalmic examination led to the diagnosis of small cell lung carcinoma with anterior segment metastasis. The patient underwent six cycles of systemic chemotherapy with a favourable response, resulting in improvement in vision and regression of the ocular lesion.
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Füst, Ágnes, Jeannette Tóth, László Imre, and Zoltán Zsolt Nagy. "Non-malignant conjunctival epithelial masses with ocular surface squamous neoplasia-like optical coherence tomography features." International Ophthalmology 41, no. 5 (2021): 1827–34. http://dx.doi.org/10.1007/s10792-021-01743-y.

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Abstract Purpose To observe and describe the anterior segment optical coherence tomography features of limbally localised non-malignant epithelial mass lesions Methods Thirteen patients (age: 66.9 ± 16.3 years) with conjunctival mass suggesting ocular surface squamous neoplasia with biomicroscopic examination were imaged using anterior segment ocular coherence tomography (anterior segment optical coherence tomography)/Cirrus HD-OCT, Model 4000, Carl Zeiss Meditec, Inc., Dublin, CA, and Spectralis HRA + OCT system, Heidelberg Engineering, Vista, CA/. Cases with ocular surface squamous neoplasia-like anterior segment optical coherence tomography (hyperreflective, thickened epithelium and an abrupt transition from normal to abnormal) were included in the study. Maximal thickness of the epithelium was measured. Histological diagnosis was gained from an excisional or incisional biopsy or impression cytology specimens. Results In six patients (age: 68.5 ± 15.4 years) with ocular surface squamous neoplasia-like anterior segment optical coherence tomography features, the histological diagnosis was other than ocular surface squamous neoplasia (papilloma, parakeratosis and a keratotic plaque with mild dysplasia), and ocular surface squamous neoplasia in seven cases (age: 65.6 ± 18.0 years). The maximal epithelial thickness was between 250 and 859 µm in non-ocular surface squamous neoplasia cases and between 252 and 596 µm in ocular surface squamous neoplasia cases. Conclusion Non-malignant epithelial lesions can mimic ocular surface squamous neoplasia on anterior segment optical coherence tomography.
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Maruyama, Yasuhiro, Shoji Kishi, Yo Kamei, Ryo Shimizu, and Yasutaka Kimura. "Infrared angiography of the anterior ocular segment." Survey of Ophthalmology 39 (May 1995): S40—S48. http://dx.doi.org/10.1016/s0039-6257(05)80072-4.

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Dissertations / Theses on the topic "Anterior ocular segment"

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Oehring, Daniela. "Ocular biomechanics of the anterior segment." Thesis, University of Plymouth, 2018. http://hdl.handle.net/10026.1/10647.

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The thesis investigates methods of examining corneal biomechanics using non-contact tonometry and introduces novel techniques to investigate corneal material properties in vivo. A comprehensive systems analysis of the CorvisST (CST) and Ocular Response Analyser (ORA) was performed. Pressure sensors were used to characterisation the airflow produced by the CST and the ORA. Distinct differences were observed between the central airflow pressures between the two devices: the CST pressure was higher and of shorter duration. Scheimpflug high-speed imaging via the CST allowed components of the corneal deformation to be investigated and the development of a 3D deformation matrix (time, depth and spatial resolution) through tracing of the anterior and posterior corneal surface. Measures of whole eye movement (WEM) with CST were found to be robust. WEM demonstrated an asymmetric profile and a correction method was developed to address the corneal deformation matrix for this asymmetry. Novel methods for characterisation of intrinsic material characteristics of the cornea were developed using numerical and graphical analytical procedures. Application of these parameters was tested on enucleated porcine eyes across a wide range of manometry internal ocular pressure (MIOP). The dynamic E-Modulus was found to be most affected by MIOP change. To investigate the in vivo distribution and heterogeneity of the corneal biomechanics, a novel set-up allowed the mapping of corneal biomechanics across the cornea using the CST (central, paracentral, peripheral) and ORA (central, peripheral). Biometric and demographic grouping of subjects allowed detection of discriminating factors between individuals. The results suggest that the in vivo cornea of healthy human adults can be characterised as a viscoelastic, damped system for longitudinal strain and a highly oscillating system for lateral strain. The cornea is approximately homogenous for measures of rigidity and dynamic E-Modulus but other corneal material characteristics (longitudinal and lateral strain, hysteresis, damping and compressibility) demonstrated regional differences. The experimental design employed allowed for strict control of biometric and biomechanical intersubject variables, based on gold-standard techniques as well as newly-developed methods, thereby creating a normative database for future use.
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Varikooty, Jalaiah. "Ocular Discomfort Upon Tear Drying." Thesis, University of Waterloo, 2003. http://hdl.handle.net/10012/1239.

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<b>Purpose:</b> Assess the relationship between tear film drying and sensation between blinks. <b>Methods:</b> MATLAB sampled a slitlamp video camera, a potentiometer and a microphone while subjects kept one eye open for as long as possible. 23 subjects rated the intensity of the ocular sensation while video and voice data were collected simultaneously. The tear drying on the cornea was measured. <b>Results:</b> The sensation was triphasic. Two linear functions described the latter 2 parts of the data (r &#8805; 0. 95). The correlation between TBUT and the elbow in the time-discomfort function was 0. 72. Extent of tear film drying was linearly correlated to time (median correlation = 0. 88). The correlation between the discomfort elbow and image elbow was 0. 93 with single data pair for each subject. Analysis of sensation characteristics showed significant differences between itching and burning for both intensity and time (p = 0. 03 and p = 0. 02 respectively). <b>Conclusions:</b> Simultaneous recording of ocular surface appearance, discomfort intensity and attributes of sensation provide novel information about the development of discomfort during ocular surface drying. The rapid increase in discomfort proceeding blinking has been quantified and the relationship between the time course of drying and discomfort is elucidated.
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Nisa, Georgette. "The prevalenceof anterior segment and crystalline lens changes in a Nicaraguan population." Thesis, Linnéuniversitetet, Institutionen för medicin och optometri (MEO), 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:lnu:diva-54213.

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Abstract Aim: The purpose of this study was to find the prevalence of different ocular changes in the anterior segment of the eye and changes in the crystalline lens among Nicaraguan population. Method: The study was done during a journey to Nicaragua with the organization VFA and Synoptik that lasted for two weeks in March/April. There were a total of 134 participants with 71 females and 63 males. The average age of the study participants was 50 (±20) years and the age ranged from 7 to 97 years. The total sample size was collected in the three towns that we visited during the journey: Ticuantepe, Léon and Estéli. The changes were evaluated by direct ophthalmoscopy. Conjunctiva was examined by asking the patients to look into different gaze directions. Cornea and crystalline lens was examined by asking the patient to look directly at the ophthalmoscope. Results: 31% out of the participants enrolled in this study were healthy with no visible ocular changes. The remaining 69% had ocular changes with majority of them having either cataract, pterygium or pinguecula. The prevalence of cataract was 24%, pterygium 20%, pinguecula 10%. There were other minor ocular changes such as red eye in 4%, arcus senilis in 4%, ptosis in 1%, and aphakia in 1% seen in these participants. Conclusion: The UV related changes had the highest prevalence. This study like previous studies have shown that cataract was most prevalent ocular change in this population.
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Bachu, Rinda Devi. "Development and Evaluation of a Novel Microemulsion of Dexamethasone and Tobramycin for Topical Ocular Administration." University of Toledo Health Science Campus / OhioLINK, 2017. http://rave.ohiolink.edu/etdc/view?acc_num=mco1512562325333526.

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Kezic, Jelena Marie. "A study of the monocyte-derived cell populations of the uveal tract and retina in homeostatic conditions and during the early stages of ocular autoimmune disease." University of Western Australia. School of Anatomy and Human Biology, 2008. http://theses.library.uwa.edu.au/adt-WU2009.0084.

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The eye contains closely related but widely different tissues, offering a unique opportunity to investigate the phenotype and function of monocyte-derived cell populations within functionally unique microenvironments in a single complex organ. The uveal tract and retina contain rich networks of immune cells that reside and traffic through the eye, these cells having been implicated in various ocular inflammatory processes and immune-mediated diseases. One such inflammatory condition is human posterior uveitis, an autoimmune disease mainly affecting the retina. As current treatments for posterior uveitis only serve to slow down disease progression, studies using animal models, namely, experimental autoimmune uveoretinitis (EAU), have focused on determining the key cellular and molecular mediators involved in disease initiation in order to expand the potential for novel therapeutic applications. The overall purpose of experiments in this thesis was to explore monocyte-derived cell populations of the uveal tract and retina, this being achieved by utilising a novel transgenic mouse model. Cx3cr1gfp/gfp transgenic mice on both BALB/c and C57Bl/6 backgrounds contain an enhanced green fluorescent protein (eGFP) encoding cassette knocked into the Cx3cr1 gene, disrupting its expression but facilitating GFP expression under the control of the Cx3cr1 promoter. Heterozygous (Cx3cr1+/gfp) mice were generated by crossing Cx3cr1gfp/gfp mice to wild-type (WT) mice. This transgenic model allowed for the exquisite visualisation of Cx3cr1-bearing monocyte-derived dendritic cells (DC) and macrophages in ocular tissues, whilst also enabling the investigation of a potential role for Cx3cr1 in recruiting monocyte-derived cells to the eye in steady-state and inflammatory conditions.
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Yamane, Iris de Souza. "Avaliação de parâmetros tomográficos de córnea e segmento anterior e de variáveis desencadeadas pela resposta ocular à tonometria de não contato." Universidade de São Paulo, 2012. http://www.teses.usp.br/teses/disponiveis/5/5149/tde-10102012-103707/.

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OBJETIVO: avaliar e correlacionar parâmetros tomográficos de segmento anterior e parâmetros biomecânicos de córnea entre si, com a idade e o gênero de pacientes com olhos normais. MÉTODOS: um estudo clínico de série de casos com intervenção diagnóstica foi realizado, envolvendo um olho selecionado aleatoriamente de 235 pacientes (235 olhos). Os pacientes foram submetidos a exame oftalmológico completo, incluindo avaliação tomográfica (Pentacam) e biomecânica (ORA). Parâmetros avaliados pelo Pentacam: K1, K2, K Front Max , Astig, ISV, IVA, KI, CKI, IHA, IHD, BAD D, BAD Df, BAD Db, BAD Dp, BAD Dt, BAD Dy, ART Max, ART Avg, ART Min, Enh BFS Front 8mm, Enh BFS Back 8mm, Ele F BFS 8mm Apex, Ele F BFS 8mm Thinnest, Ele F BFS 8mm Max 4mm zone, Ele B BFS 8mm Apex, Ele B BFS 8mm Thinnest, Ele B BFS 8mm Max 4mm zone, Ele F BFTE 8mm Apex, Ele F BFTE 8mm Thinnest, Ele F BFTE 8mm 4 mm zone, Ele B BFTE 8mm Apex, Ele B BFTE 8mm Thinnest, Ele B BFTE 8mm Max 4mm zone, RPI Max, RPI Avg, RPI Min, Diff RPI Max Compl, Diff RPI Min Compl, Pachy Min, Pachy Apex, Pachy Pupil, Rel Pachy Min, Asph Q Front 30º, Asph Q Back 30º, Q Asymmetr Frontal Hor 30º, Q Asymmetr Frontal Vert 30º, AC Depth, AC Volume, Ch Angle, Volume, PNS, Densid Avg %. Parâmetros avaliados pelo ORA: IOPg, IOPcc, CH, CRF, KC Score, KC Normal, KC Suspect, KC Mild, KC Moderate, KC Severe, WS, aindex, bindex, p1area, p2area, aspect1, aspect2, uslope1, uslope2, dslope1, dslope2, w1, w2, h1, h2, dive1, dive2 , path1, path2, mslew1, mslew2, slew1, slew2, aplhf, p1area1, p2area1, aspect11, aspect21, uslope11, uslope21, dslope11, dslope21, w11, w21, h11, h21, path11, path21. RESULTADOS: K1, K2, K Max Front, BAD Df, Ele B BFS 8mm Thinnest, Ele B BFTE 8mm Thinnest, CRF e CH apresentaram valores mais altos no sexo feminino, enquanto BAD Db, Enh BFS Front 8mm, AC Depth, AC Volume, Ch Angle, p1area, w2, h1, p1area1, w21 e h11 apresentam valores mais altos no sexo masculino. CKI, BAD Db, Ele F BFS 8mm Apex, Ele F BFS 8mm Thinnest, Ele F BFTE 8mm Apex, Ele F BFTE 8mm Thinnest, Asph Q Back 30º, AC Depth, Ch Angle mostraram forte correlação negativa com a idade. Ele B BFS 8mm Apex, Ele B BFS 8mm Thinnest, Ele B BFTE 8mm Apex, Ele B BFTE 8mm Thinnest mostraram forte correlação positiva com a idade. As correlações mais altas de CH e CRF ocorreram com BAD Dt, Pachy Min, Pachy Apex e Pachy Pupil, ou seja, CH e CRF apresentaram associação positiva com a espessura corneana central. As correlações mais altas da IOPg ocorreram com BAD Dt, ART Max, ART Avg, Pachy Min, Pachy Apex e Pachy Pupil mostrando ser afetada pela espessura corneana. A IOPcc mostrou correlações mais baixas do que as obtidas com a IOPg, sendo esta menos afetada pela espessura corneana. CONCLUSÃO: Os parâmetros tomográficos de segmento anterior (Pentacam) e biomecânicos (ORA) mostraram diversas associações estatisticamente significantes entre si com a idade e com o gênero de pacientes com olhos normais<br>PURPOSE: to evaluate and to correlate anterior segment tomography parameters and corneal biomechanical parameters between each other, age and gender in patients with healthy eyes. METHODS: a clinical study of case series design with diagnostic intervention was conducted, involving one eye randomly selected from 235 patients (235 eyes). Patients underwent complete ophthalmological examination, including tomographic (Pentacam) and biomechanical (ORA) evaluation. Pentacam parameters assesssed: K1, K2, K Front Max , Astig, ISV, IVA, KI, CKI, IHA, IHD, BAD D, BAD Df, BAD Db, BAD Dp, BAD Dt, BAD Dy, ART Max, ART Avg, ART Min, Enh BFS Front 8mm, Enh BFS Back 8mm, Ele F BFS 8mm Apex, Ele F BFS 8mm Thinnest, Ele F BFS 8mm Max 4mm zone, Ele B BFS 8mm Apex, Ele B BFS 8mm Thinnest, Ele B BFS 8mm Max 4mm zone, Ele F BFTE 8mm Apex, Ele F BFTE 8mm Thinnest, Ele F BFTE 8mm 4 mm zone, Ele B BFTE 8mm Apex, Ele B BFTE 8mm Thinnest, Ele B BFTE 8mm Max 4mm zone, RPI Max, RPI Avg, RPI Min, Diff RPI Max Compl, Diff RPI Min Compl, Pachy Min, Pachy Apex, Pachy Pupil, Rel Pachy Min, Asph Q Front 30º, Asph Q Back 30º, Q Asymmetr Frontal Hor 30º, Q Asymmetr Frontal Vert 30º, AC Depth, AC Volume, Ch Angle, Volume, PNS, Densid Avg %. ORA Parameters assessed: IOPg, IOPcc, CH, CRF, KC Score, KC Normal, KC Suspect, KC Mild, KC Moderate, KC Severe, WS, aindex, bindex, p1area, p2area, aspect1, aspect2, uslope1, uslope2, dslope1, dslope2, w1, w2, h1, h2, dive1, dive2 , path1, path2, mslew1, mslew 2, slew1, slew2, aplhf, p1area1, p2area1, aspect11, aspect21, uslope11, uslope21, dslope11, dslope21, w11, w21, h11, h21, path11, path21. RESULTS: K1, K2, K Max Front, BAD Df, Ele B BFS 8mm Thinnest, Ele B BFTE 8mm Thinnest, CRF and CH showed higher values in females and BAD Db, Enh BFS Front 8mm, AC Depth, AC Volume, Ch Angle, p1area, w2, h1, p1area1, w21 and h11 showed higher values in males. CKI, BAD Db, Ele F BFS 8mm Apex, Ele F BFS 8mm Thinnest, Ele F BFTE 8mm Apex, Ele F BFTE 8mm Thinnest, Asph Q Back 30º, AC Depth, Ch Angle showed strong negative correlation with age. Ele B BFS 8mm Apex, Ele B BFS 8mm Thinnest, Ele B BFTE 8mm Apex, Ele B BFTE 8mm Thinnest showed strong positive correlation with age. The highest correlations of CH and CRF occurred with BAD Dt, Pachy Min, Pachy Apex and Pachy Pupil, i.e. CH and CRF presented positive association with central corneal thickness. The highest correlations of IOPg occurred with BAD Dt, ART Max, ART Avg, Pachy Min, Pachy Apex and Pachy Pupil, showing that it is affected by the thickness of the cornea. IOPcc showed lower correlations than those obtained with IOPg, showing that it is less affected by the thickness of the cornea. CONCLUSION: Anterior segment tomographic parameters (Pentacam) and biomechanical parameters (ORA) showed several statistically significant associations between each other, age and gender in patients with healthy eyes
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Kohandani, Tafreshi Marzieh. "Reconstruction 3D du segment antérieur oculaire par échographie haute fréquence." Thesis, Brest, 2014. http://www.theses.fr/2014BRES0003.

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Une des applications de l’échographie médicale est celle de l’ophtalmologie qui pose de nombreux problèmes spécifiques liés en partie à la faible dimension de l’oeil et à la précision importante que requièrent les mesures intraoculaires. En effet, avec le développement de la chirurgie réfractive qui regroupe ensemble des techniques capables de corriger les erreurs de réfraction et l’avènement des implants intraoculaires, le chirurgien ophtalmologiste est amené à surveiller la tolérance et les effets secondaires de ces implants sur les structures du segment antérieur. L’échographie à haute fréquence apporte la résolution suffisante pour cette tâche. Cependant, le développement de l’échographie 3D permet une extension des applications ophtalmologiques notamment pour le dimensionnement des implants en préopératoire. La modélisation 3D du segment antérieur permet d’étudier le comportement des implants et surtout de dessiner à terme un implant « sur mesure » pour le patient. C’est dans ce contexte que nous présentons une méthode originale de segmentation et de reconstruction 3D du segment antérieur par échographique haute fréquence en utilisant l’ajustement de modèles 3D. Nous utilisons un système échographique 3D de type main-libre, composé d’une sonde échographique haute fréquence, et d’un module de localisation actif comprenant une caméra et des marqueurs infrarouges. Ce système échographique 3D nous permet d’obtenir des images avec des informations de positionnement dans l’espace tridimensionnel associées. Nous avons ainsi pu mettre en place toute une chaîne d’acquisitions et de traitements des images échographiques. Nous créons, à partir d’images échographiques du segment antérieur oculaire, des modèles de référence 3D réalistes. Nous proposons ainsi une méthode d’ajustement de modèles 3D de référence sur des données 3D échographiques via l’utilisation de l’algorithme de recalage ICP. Nous avons également sélectionné et adapté différentes méthodes pour l’évaluation de l’approche de reconstruction proposée. Ces méthodes permettent de mettre en valeur la précision de ces reconstructions<br>Ophthalmology is one of the clinical application fields of ultrasound imaging, for which numerous specific issues arise, related in part to the eye’s small anatomical dimensions combined with the high level of accuracy requirements associated with intraocular measurements. Indeed, since the development of refractive surgery including all the techniques dedicated to the correction of refractive errors, as well as the emergence of intraocular lens (IOL), ophthalmic surgeons have to monitor overall acceptance as well as secondary effects related to these implants on the structures of the anterior eye segment. High frequency ultrasound imaging provides the required spatial resolution for this task. However, the development of 3D ultrasound imaging allows for the development of new applications in ophthalmology, for instance pre-operative dimensioning of the lens. 3D modelling of the anterior eye segment therefore allows studying the IOL behaviour and may help designing future personalized IOL tailored for each patient. Within this context, we present an original 3D segmentation and reconstruction method based on 3D models registration, dedicated to the anterior eye segment acquired in high frequency ultrasound imaging. We used a 3D ultrasound free-hand acquisition system, composed of a high frequency ultrasound probe and a localization module based on a camera and infrared markers. This 3D ultrasound system provides images along with associated 3D spatial positioning information. We were therefore able to develop an entire ultrasound images acquisition and processing chain. This allowed us creating realistic reference 3D models from sequences of ultrasound images of the anterior eye segment. We thus propose a method based on the iterative closest point (ICP) algorithm for the registration of the 3D reference models to 3D ultrasound acquired data. We have also selected and adapted various methods for the evaluation of the proposed reconstruction process. These methods highlight the accuracy of the obtained reconstructions
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Muquillaza, Valenzuela Meliton Arturo. "Manifestaciones oculares en segmento anterior en pacientes con VIH/sida en la era pre-TARGA en el Servicio de Oftalmología del Hospital Nacional Dos de Mayo de enero a diciembre 2007, Lima – Perú." Bachelor's thesis, Universidad Nacional Mayor de San Marcos, 2011. https://hdl.handle.net/20.500.12672/14943.

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Se realizó un estudio retrospectivo, descriptivo donde se revisaron 235 historias clínicas de pacientes con diagnóstico de VIH/SIDA atendidos en la consulta externa del Servicio de Oftalmología y el Servicio de Enfermedades Infecciosas y Tropicales del Hospital Nacional Dos de Mayo ingresados del 01 de enero al 31 diciembre 2007. Dichos pacientes acudieron para ingresar al protocolo de TARGA financiado por el Fondo Global. De 235 historias clínicas revisadas de pacientes con diagnóstico de VIH/SIDA, se tiene que el promedio de la edad estuvo en 34.9 ± 9.5 años. Se observa que el mayor porcentaje fueron varones con un 73,6 %. Del total de casos solo un 32.7% presentaron resultados con niveles de CD4+, al momento del examen. Los síntomas oculares más frecuentes fueron disminución de la agudeza visual, picazón /ardor (11,9%), ojo rojo (2,97%) y sequedad ocular (2.12%). A nivel de párpados, se registraron 4.3% (10 casos) del total de pacientes con síntomas de blefaritis, además se reportaron 2 casos de sarcoma Kaposi en párpados. A nivel de conjuntiva se evidenció un 5.95% (14 casos) con microangiopatía conjuntival, de los cuales el 50% fue en ojo izquierdo, el 42.9% en ojo derecho y el 7.1% en ambos ojos. Solo se encontró un caso de conjuntivitis en ambos ojos, el cual representa el 0.4% de casos. Se registraron enfermedades asociadas en el 29.36% del total de pacientes (69 casos); siendo la TBC la enfermedad más frecuente con 79.7% (55 casos), seguida por la Sífilis con 5.8%, la neurocriptococosis con un 4.3% y la toxoplasmosis con un caso (0.4%). Concluye que la población estudiada fue en su mayoría joven y de sexo masculino, similar a los patrones de la población nacional infectada por este virus. Se encontraron manifestaciones oculares en el segmento anterior en 22,55% de los pacientes evaluados, siendo la microangiopatía conjuntival (5,96%) y la blefaritis (4,26%) las más frecuentes.<br>Trabajo académico
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9

Tauste, Francés Ana. "Valoración de las alteraciones oculares y visuales asociadas al uso de lentes de contacto en trabajadores expuestos a pantallas de visualización de datos." Doctoral thesis, Universidad de Alicante, 2016. http://hdl.handle.net/10045/70349.

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Antecedentes: El elevado número de personas que trabajando con ordenador utiliza lentes de contacto plantea la cuestión sobre si la suma de estos dos factores de riesgo para la salud visual puede originar un agravamiento de las alteraciones oculares y visuales. Objetivos: Los tres objetivos principales de esta tesis fueron: 1) sintetizar el conocimiento científico sobre las alteraciones oculares y visuales relacionadas con la exposición a ordenador en usuarios de lentes de contacto entre el año 2003 y el 2013; 2) analizar la relación entre la presencia de Síndrome Visual Informático (SVI) en trabajadores expuestos a ordenador y el uso de lentes de contacto, según las características del material de las lentes de contacto, así como observar qué sucede a medida que aumentan las horas de uso de ordenador en el trabajo; y por último 3) analizar el efecto que producen lentes de contacto de diferentes materiales sobre la superficie ocular y el estado de la película lagrimal en trabajadores expuestos a ordenador durante su jornada laboral. Metodología: Para el primer objetivo se realizó una revisión de artículos científicos (2003-2013) en español o inglés, utilizando la metodología de Scoping Review, en Medline a través de PubMed y en Scopus. La pertinencia de las referencias se decidió analizando el título y el resumen, y teniendo en cuenta los criterios de exclusión, que obedecían a no incluir artículos que no se adaptaran a la temática por centrarse solo en efectos del uso de lentes de contacto o de pantallas, o por tratar de alteraciones oculares diversas. Para el segundo y tercer objetivo se llevó a cabo un estudio observacional de diseño transversal en trabajadores de la administración pública de la provincia de Alicante (España). El estudio se realizó de noviembre de 2013 a febrero de 2014, en colaboración con el Instituto Valenciano de Seguridad y Salud en el Trabajo (INVASSAT), que se encarga de la vigilancia de la salud de estos trabajadores. Durante estas fechas un total de 496 trabajadores acudieron a su revisión. Para la realización de este estudio, a las pruebas habituales de la revisión rutinaria de vigilancia de la salud de estos trabajadores, se incluyeron pruebas específicas para conocer el estado de la superficie ocular y de la película lagrimal (hiperemia bulbar, limbar y tarsal, hipertrofia tarsal, tinción corneal, tiempo de rotura lagrimal y Schirmer), un cuestionario sobre sintomatología ocular y visual cuando se utiliza el ordenador en el trabajo (Cuestionario de Síndrome Visual Informático), así como una serie de preguntas sobre el uso de éste y en relación a las lentes de contacto. De los 496 trabajadores, el 100% accedió a contestar el cuestionario y las preguntas acerca del uso de ordenador y las lentes de contacto, y el 61,7% (n = 306 trabajadores) a realizarse además las pruebas de la superficie ocular y lágrima. En cuanto al análisis estadístico, para el objetivo 2 se llevó a cabo una regresión logística para calcular la asociación cruda (ORc) y ajustada por sexo y edad (ORa) entre SVI y los factores individuales y laborales, y entre SVI y el tipo de lentes de contacto. Para el objetivo 3 se utilizó un modelo lineal generalizado con el que calcular el riesgo relativo crudo (RRc) y ajustado por edad y sexo (RRa) para medir la asociación entre alteraciones de la superficie ocular y de la lágrima y el uso de lentes de contacto y el tipo de lente. Resultados: En relación al primer objetivo la búsqueda inicial aportó 114 referencias, tras aplicar criterios de inclusión/exclusión se incluyeron seis artículos. Todos ellos ponen de manifiesto que las alteraciones al utilizar el ordenador son más prevalentes en los usuarios de lentes de contacto, con prevalencias que oscilan de 16,9 a 95,0% en los usuarios y de 9,9 a 57,5% en no usuarios, y con una probabilidad cuatro veces mayor de padecer ojo seco (OR: 4,07; IC 95% 3,52-4,71). Las lentes de hidrogel de silicona son las que se asocian a mayor confort. El resultado principal del estudio que responde al segundo objetivo es que los trabajadores que utilizan lentes de contacto y están expuestos al ordenador más de 6 horas/día tienen más probabilidades de padecer SVI que los no usuarios de lentes de contacto trabajando con el ordenador la misma cantidad de tiempo (ORa: 4,85; IC 95% 1,25 – 18,80). El tipo de lente parece ser un factor determinante en la presencia del síndrome. Aunque no alcanza significación estadística, la tendencia observada sugiere que llevar lentes de contacto de hidrogel convencional, e incluso más en el caso de las lentes de hidrogel de silicona, aumenta la probabilidad de padecer SVI, y que esta probabilidad se incrementa a más horas de uso de ordenador. Por último, los resultados del tercer objetivo muestran que los trabajadores expuestos a ordenador que llevan lentes de contacto tienen más probabilidades de padecer hiperemia bulbar (RRa: 1,69; IC 95% 1,25-2,30), hiperemia limbar (RRa: 2,87; IC 95% 1,88-4,37), hiperemia tarsal (RRa: 2,53; IC 95% 1,35-4,73), e hipertrofia tarsal (RRa: 7,03; IC 95% 1,31-37,82) que los no usuarios. De estas alteraciones, los indicadores para hiperemia limbar y tarsal son incluso mayores en aquellos expuestos al ordenador más de 4 horas/día. Las lentes de hidrogel convencional e hidrogel de silicona se relacionan con mayores alteraciones de la superficie ocular, especialmente las primeras. Sin embargo, las alteraciones de la película lagrimal no parecen estar relacionadas con el uso de lentes de contacto, aunque la prevalencia de resultados alterados de Schirmer y del tiempo de rotura lagrimal es muy elevada en todos los trabajadores incluidos en el estudio (47,6% y 76,3% respectivamente). Conclusiones: La revisión de la literatura pone de manifiesto que los usuarios de ordenador padecen más alteraciones oculares y visuales cuando además son usuarios de lentes de contacto, pero los estudios son escasos y con resultados no concluyentes, en el sentido de que las observaciones entre los diferentes estudios son inconsistentes. El uso habitual de lentes de contacto cuando se está expuesto a ordenador 6 horas o más en el trabajo incrementa el SVI. En estas condiciones, hay una tendencia a mayores problemas en los usuarios de lentes de hidrogel convencional y lentes de hidrogel de silicona, especialmente en los usuarios de éstas últimas. Del mismo modo, el uso regular de lentes de contacto durante la exposición a ordenador incrementa el riesgo de hiperemia bulbar, limbar, tarsal, e hipertrofia tarsal. En el caso de la hiperemia limbar y tarsal, el riesgo es mayor entre aquellos que utilizan el ordenador más de 4 horas al día. Respecto al material, los usuarios de lentes de hidrogel convencional tienen el mayor riesgo de desarrollar alteraciones de la superficie ocular, seguidos por los usuarios de lentes de hidrogel de silicona. La elevada prevalencia de resultados alterados en tiempo de rotura lagrimal y Schirmer, independientemente del uso de lentes de contacto, sugiere que el uso de ordenador tiene un alto impacto en las características de la película lagrimal.
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Crawford, Kathryn Schuh. "Prostanoid effects on anterior ocular segment physiology in the macaque monkey." 1992. http://catalog.hathitrust.org/api/volumes/oclc/28738916.html.

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Books on the topic "Anterior ocular segment"

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Miller, Daved M. D. TREATMENT OF ANTERIOR SEGMENT OCULAR TRAUMA; A PERSPECTIVE OF VISCOSURGICAL TECHNIQUES AND APPLICATIONS. Edited by Daved M. D. Miller. Medicopea International, 1986.

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Handbook of Ocular Infections, Inflammation, and External Diseases. 4th ed. Slack Incorporated, 2000.

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Mannis, Mark J., and Edward J. Holland. Ocular Surface Disease: Medical and Surgical Management. Springer, 2002.

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Mannis, Mark J. Ocular Surface Disease: Medical And Surgical Management. Springer, 2011.

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Herranz, Raul Martin, and Rosa M. Corrales Herran. Ocular Surface: Anatomy and Physiology, Disorders and Therapeutic Care. Taylor & Francis Group, 2012.

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Ocular Surface: Anatomy and Physiology, Disorders and Therapeutic Care. Taylor & Francis Group, 2012.

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Herranz, Raul Martin, and Rosa M. Corrales Herran. Ocular Surface: Anatomy and Physiology, Disorders and Therapeutic Care. Taylor & Francis Group, 2012.

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Mannis, Mark J., Edward J. Holland, and W. Barry Lee. Ocular Surface Disease : Cornea, Conjunctiva and Tear Film: Expert Consult - Online and Print. Elsevier - Health Sciences Division, 2013.

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Brusi, Laura, Darío H. Panaroni, Lady V. Argüello Salcedo, and Paula Andrea Faccia. Exploración con biomicroscopio ocular. Editorial de la Universidad Nacional de La Plata (EDULP), 2014. http://dx.doi.org/10.35537/10915/38874.

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&lt;i&gt;Exploración con biomicroscopio ocular&lt;/i&gt; es un libro que puede ser utilizado desde los primeros semestres en los programas de Óptica y Optometría, por su manera clara y sencilla de explicar cada una de las partes del segmento anterior y las diferentes técnicas de iluminación a través del examen de biomicroscopía, entendiendo que éste examen es uno de los más importantes y necesarios para el manejo adecuado de la salud visual y ocular de nuestros pacientes. Es por ello que el libro inicia en su primer capítulo con el tema del “Rol social y profesional del contactólogo”, explicando el porqué debemos como profesionales de la salud visual capacitarnos y prepararnos para hacer de manera adecuada la atención primaria en salud visual. Continúa explicando las técnicas de iluminación paso por paso de manera sencilla y detallada, permitiendo de una manera clara y específica que el lector entienda el cómo utilizarlas de manera adecuada. Los demás capítulos profundizan en la descripción anatómica, fisiológica y patológica de las estructuras del segmento anterior. &lt;i&gt;(del prólogo de Margarita María Ayala Cárdenas)&lt;/i&gt;
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Book chapters on the topic "Anterior ocular segment"

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Lee, Richard K., and Mohamed S. Sayed. "Anterior Segment Trauma." In Mechanical Ocular Trauma. Springer Singapore, 2016. http://dx.doi.org/10.1007/978-981-10-2150-3_2.

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Hayreh, Sohan Singh. "Anterior Segment Ischemia." In Ocular Vascular Occlusive Disorders. Springer International Publishing, 2014. http://dx.doi.org/10.1007/978-3-319-12781-1_20.

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Latifi, Golshan, and Parisa Abdi. "Anterior Segment Optical Coherence Tomography." In Diagnostics in Ocular Imaging. Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-54863-6_7.

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Boente, Charline S., and Faruk H. Örge. "Anterior Segment Dysgenesis Syndromes." In Practical Management of Pediatric Ocular Disorders and Strabismus. Springer New York, 2016. http://dx.doi.org/10.1007/978-1-4939-2745-6_14.

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Hayreh, Sohan Singh. "Blood Supply of the Anterior Segment." In Ocular Vascular Occlusive Disorders. Springer International Publishing, 2014. http://dx.doi.org/10.1007/978-3-319-12781-1_6.

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Moghimi, Sasan, Mona SafiZadeh, and Jiun Do. "Anterior Segment Optical Coherence Tomography and Glaucoma." In Diagnostics in Ocular Imaging. Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-54863-6_29.

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Gray, Michael Eric. "Anterior Segment Trauma (Non-chemical)." In Practical Management of Pediatric Ocular Disorders and Strabismus. Springer New York, 2016. http://dx.doi.org/10.1007/978-1-4939-2745-6_17.

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Kaufman, Aaron R., and Adam H. Kaufman. "Pediatric Herpes Virus Anterior Segment Infections." In Practical Management of Pediatric Ocular Disorders and Strabismus. Springer New York, 2016. http://dx.doi.org/10.1007/978-1-4939-2745-6_11.

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Hashemi, Hassan, Kazem Amanzadeh, and Fedra Hajizadeh. "Anterior Segment Optical Coherence Tomography (AS-OCT)." In Atlas of Ocular Optical Coherence Tomography. Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-66757-7_11.

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Falcinelli, G., P. Colliardo, V. Petitti, and C. Pinna. "Tissucol (Tisseel) in Surgery of the Ocular Anterior Segment." In Fibrin Sealant in Operative Medicine. Springer Berlin Heidelberg, 1986. http://dx.doi.org/10.1007/978-3-642-71391-0_14.

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Conference papers on the topic "Anterior ocular segment"

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Wang, Ke, Guangyu Wang, Kang Zhang, and Ting Chen. "An Adversarial Collaborative-Learning Approach for Corneal Scar Segmentation with Ocular Anterior Segment Photography." In 2021 IEEE International Conference on Image Processing (ICIP). IEEE, 2021. http://dx.doi.org/10.1109/icip42928.2021.9506621.

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