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Dissertations / Theses on the topic 'Lens'

Author: Grafiati

Published: 4 June 2021

Last updated: 25 July 2025

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1

Yan, Yufeng. "Photographic Fisheye Lens Design for 35mm Format Cameras." Thesis, The University of Arizona, 2016. http://hdl.handle.net/10150/613395.

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Fisheye lenses refer to ultra-wide angle lenses that have field of view equal or larger than 180 degrees. Such lenses introduce large amount of barrel distortion to capture at least the entire hemisphere in front of the lens. Fisheye lenses were initially designed for scientific use, such as cloud recording and angle measuring, and were widely used for commercial purposes later. The development of photographic fisheye lenses started in 1960s. However, the lack of detailed references on photographic fisheye lens design makes such design challenging. This thesis provides detailed introduction of

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2

Shepard, III Ralph Hamilton. "Metamaterial Lens Design." Diss., The University of Arizona, 2009. http://hdl.handle.net/10150/194734.

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Developments in nanotechnology and material science have produced optical materials with astonishing properties. Theory and experimentation have demonstrated that, among other properties, the law of refraction is reversed at an interface between a naturally occurring material and these so-called metamaterials. As the technology advances metamaterials have the potential to vastly impact the field of optical science.In this study we provide a foundation for future work in the area of geometric optics and lens design with metamaterials. The concept of negative refraction is extended to derive a c

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3

Shams-Ul-Bari, Naveed. "Isospectral orbifold lens spaces." Thesis, Loughborough University, 2016. https://dspace.lboro.ac.uk/2134/23981.

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Spectral theory is the study of Mark Kac's famous question [K], "can one hear the shape of a drum?" That is, can we determine the geometrical or topological properties of a manifold by using its Laplace Spectrum? In recent years, the problem has been extended to include the study of Riemannian orbifolds within the same context. In this thesis, on the one hand, we answer Kac's question in the negative for orbifolds that are spherical space forms of dimension higher than eight. On the other hand, for the three-dimensional and four-dimensional cases, we answer Kac's question in the affirmative fo

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4

Yuan, Sheng. "Aberrations of Anamorphic Optical Systems." Diss., The University of Arizona, 2008. http://hdl.handle.net/10150/195267.

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A detailed study of the aberrations of anamorphic optical systems is presented. This study has been developed with a theoretical structure similar to that of rotationally symmetric optical systems (RSOS) and can be considered a generalization.A general method of deriving the monochromatic primary aberration coefficient expressions for any anamorphic system types with double plane symmetry has been provided.The complete monochromatic primary aberration coefficient expressions for cylindrical anamorphic systems, toroidal anamorphic systems and general anamorphic systems with aspheric departure h

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5

Wilson, Cynthia Nicole. "A Fully Customizable Anatomically Correct Model of the Crystalline Lens." Thèse, Université d'Ottawa / University of Ottawa, 2011. http://hdl.handle.net/10393/20130.

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The human eye is a complex optical system comprised of many components. The crystalline lens, an optical component with a gradient index (GRIN), is perhaps the least understood as it is situated inside the eye and as a result is difficult to characterize. Its complex nonlinear structure is not easily measured and consequently not easily modeled. Presently several models of the GRIN structure exist describing the average performance of crystalline lenses. These models, however, do not accurately describe the performance of crystalline lenses on an individual basis and a more accurate individual

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6

Kumar, Bharat. "The Mechanobiology of the Crystalline Lens." The Ohio State University, 2020. http://rave.ohiolink.edu/etdc/view?acc_num=osu1587649113548924.

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7

Ollinger, Christoph German Josef. "A waveguide-based lens-less x-ray microscope." Doctoral thesis, [S.l.] : [s.n.], 2006. http://webdoc.sub.gwdg.de/diss/2006/ollinger.

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8

Sasián, José. "Joseph Petzval lens design approach." SPIE-INT SOC OPTICAL ENGINEERING, 2017. http://hdl.handle.net/10150/627184.

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9

Gao, Weichuan, and Jose Sasian. "Air lens vs aspheric surface: a lens design case study." SPIE-INT SOC OPTICAL ENGINEERING, 2017. http://hdl.handle.net/10150/627181.

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We discuss the behavior of air lenses in lens design. The structural aberration coefficients of a thin air lens are derived and compared with their glass thin lens counterpart. Examples are provided for a telephoto lens and the Monochromatic Quartet where air lenses or aspheric surfaces are used.

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10

DePianto, Daryle Joseph. "Studies on lens fiber cell gene expression & lens differentiation /." Connect to Digital dissertations. Restricted to UC campuses. Access is free to UC campus dissertations, 2002. http://uclibs.org/PID/11984.

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11

Shu, Daisy Yao. "TGFβ, BMP and EGF interplay in the pathogenesis of fibrotic cataract: a tale of three growth factors". Thesis, The University of Sydney, 2019. http://hdl.handle.net/2123/20493.

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The ocular lens is bathed by a cocktail of growth factors, such as fibroblast growth factor (FGF), bone morphogenetic protein (BMP), insulin-like growth factor (IGF), epidermal growth factor (EGF) and transforming growth factor-beta (TGFβ) that differentially influence cellular behaviour. While some growth factors such as FGF, BMP and EGF facilitate normal physiological lens processes, TGFβ is unique in that it is a potent inducer of lens cell pathology, namely, epithelial-mesenchymal transition (EMT) leading to fibrotic cataract formation. The studies in this thesis primarily explore the intr

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12

Yang, Dingjie. "The Network Lens." Thesis, Linnaeus University, School of Computer Science, Physics and Mathematics, 2010. http://urn.kb.se/resolve?urn=urn:nbn:se:lnu:diva-6626.

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<p>A complex network graphics may be composed of hundreds and thousands of objects, such as nodes and edges. Each object may hold a large number of attributes that might be difficult to explore in the network visualization. Therefore, many visualization tools and approaches have been developed to gain more information from the network graphics. In this paper, we introduce the concept of the Network Lens<em>, </em>a new widget that assists the users to deal with a complex network. The Network Lens is an interactive tool that combines data visualization to a magic lens. With the help of the Netw

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13

Weir, I. J. M. "The thermal lens." Thesis, University of Strathclyde, 1985. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.372116.

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14

Amador, Lui. "Deslanting the Lens." Scholarship @ Claremont, 1999. http://scholarship.claremont.edu/cgu_etd/93.

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Deslanting the Lens examines the historical and sociological implications of how Asian men have been represented in popular American film. From the early days of “yellowface” to caricatures like Long Duck Dong, Asian men have been relegated to perpetual foreigner status in American cinema. This paper will explore why the portrayal of Asian men has been limited to very specific ideas about Asian and Asian Americans are in society. This analysis will also include how socio/political events have shaped and influence popular perceptions about Asians, that inform how Asian men continue to be depict

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15

Crouch, Izzy. "Beyond the Lens." Scholarship @ Claremont, 2019. https://scholarship.claremont.edu/scripps_theses/1245.

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Beyond the Lens is a portrait series combining visual images with audiotaped recordings of eight Scripps seniors’ narration of their personal, academic and interpersonal process during the course of their college career. This capstone project seeks to uncover the dynamic nature of the Scripps College community by highlighting the unique evolution of these eight individuals. With this project, I hope to convey that while there is no one specific mold for a Scripps student, there are common threads in the development of key characteristics which propel these participants toward their next steps,

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16

Nichols, Jason Jay. "Evaporative tear film and contact lens factors associated with dry eye symptoms in contact lens wearers." The Ohio State University, 2004. http://rave.ohiolink.edu/etdc/view?acc_num=osu1085771728.

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17

Hott, John Lester. "Photochemical alterations of ocular lens proteins." Diss., Georgia Institute of Technology, 1991. http://hdl.handle.net/1853/30087.

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18

Sasian, Jose, and Yufeng Yan. "Miniature camera lens design with a freeform surface." SPIE-INT SOC OPTICAL ENGINEERING, 2017. http://hdl.handle.net/10150/627187.

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We present a miniature camera lens design method that uses a freeform surface based on the pedal curve to the ellipse in polynomial form. Two designs are presented and their benefits of optical performance and tolerance sensitivity are compared to designs with conventional aspheric surfaces. We also reverse a freeform design using even aspherical surfaces to show that the optimization solution of a freeform design cannot be reproduced by even aspherical surfaces.

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19

Stapleton, Fiona J. "The pathogenesis and epidemiology of contact lens related disease in cosmetic contact lens wearers." Thesis, City University London, 1991. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.280544.

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20

Rueff, Erin M. "Contact Lens Discomfort, Vision Correction Preferences, and Accommodative Treatment in Presbyopic and Non-Presbyopic Contact Lens Wearers." The Ohio State University, 2018. http://rave.ohiolink.edu/etdc/view?acc_num=osu1529583462118691.

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21

Moore, Lori Briggs. "Defining Ray Sets for the Analysis of Lenslet-Based Optical Systems Including Plenoptic Cameras and Shack-Hartmann Wavefront Sensors." Diss., The University of Arizona, 2014. http://hdl.handle.net/10150/332894.

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Plenoptic cameras and Shack-Hartmann wavefront sensors are lenslet-based optical systems that do not form a conventional image. The addition of a lens array into these systems allows for the aberrations generated by the combination of the object and the optical components located prior to the lens array to be measured or corrected with post-processing. This dissertation provides a ray selection method to determine the rays that pass through each lenslet in a lenslet-based system. This first-order, ray trace method is developed for any lenslet-based system with a well-defined fore optic, where

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22

Valley, Pouria. "FLAT LIQUID CRYSTAL DIFFRACTIVE LENSES WITH VARIABLE FOCUS AND MAGNIFICATION." Diss., The University of Arizona, 2010. http://hdl.handle.net/10150/145737.

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Non-mechanical variable lenses are important for creating compact imaging devices. Various methods employing dielectrically actuated lenses, membrane lenses, and liquid crystal lenses were previously proposed [1-4]. In This dissertation the design, fabrication, and characterization of innovative flat tunable-focus liquid crystal diffractive lenses (LCDL) are presented. LCDL employ binary Fresnel zone electrodes fabricated on Indium-Tin-Oxide using conventional micro-photolithography. The light phase can be adjusted by varying the effective refractive index of a nematic liquid crystal sandwiche

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23

Tagliaferri, Angela. "Risk Factors for Contact Lens Induced Papillary Conjunctivitis Associated with Silicone Hydrogel Contact Lens Wear." Case Western Reserve University School of Graduate Studies / OhioLINK, 2012. http://rave.ohiolink.edu/etdc/view?acc_num=case1339094018.

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24

Selby, Alastair Phillip. "Nanoindentation of soft contact lens materials." Thesis, University of Manchester, 2012. https://www.research.manchester.ac.uk/portal/en/theses/nanoindentation-of-soft-contact-lens-materials(502085d8-3325-4ea8-926c-ad75b15a557d).html.

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The launch of silicone hydrogel contact lenses has led to a rise in the incidence of mechanically-related clinical complications, which is thought to be due to the increased stiffness of these materials compared to conventional hydrogel lens materials. The mechanical characteristics of hydrogel contact lenses have traditionally been investigated using tensile testing which investigated the bulk material characteristics. This thesis presents a study intended to establish a repeatable method for local mechanical measurement of hydrogel contact lenses using nanoindentation. Hydrogel materials in

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25

Jamali, Afsoon Jamali. "LARGE AREA TUNABLE LIQUID CRYSTAL LENS." Kent State University / OhioLINK, 2018. http://rave.ohiolink.edu/etdc/view?acc_num=kent1541671894328594.

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26

Dye, Simon. "Gravitational lens mass reconstruction." Thesis, University of Edinburgh, 2000. http://hdl.handle.net/1842/27964.

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A highly desirable technique sought after by cosmology is one which enables the accurate mass measurement of rich galaxy clusters. From observations of their abundance and primarily their mass, clusters give strong constraints on the density parameter of the Universe, models of structure formation and normalisation of the power spectrum of density fluctuations. Gravitational lensing provides such a technique. Prevailing over X-ray temperature and virial velocity methods known to be problematic, lensing permits determination of cluster masses independent of dynamical state. This thesis concentr

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27

McDermott, Joshua D. "The ovine lens cytoskeleton." Lincoln University, 2007. http://hdl.handle.net/10182/700.

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The lens of the eye is a vital tissue in the visual system, responsible for the collection and focusing of light on to the retina. Comprised of epithelial cells at differing stages of differentiation, the transparency of the lens is dependent on the highly ordered crystalline structure of lens proteins. The lens consists of several proteins including crystallins (α, β, γ) that make up 90% of the soluble protein, and the lens cytoskeletal proteins. Cytoskeletal proteins contribute only a fraction of the total lens protein, but are thought to play an important role in the establishment and maint

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28

Sparrow, John Martin. "The lens in diabetes." Thesis, University of Oxford, 1988. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.238162.

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29

Tomlinson, Richard J. "Lens design for manufacture." Thesis, Loughborough University, 2005. https://dspace.lboro.ac.uk/2134/14554.

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The manufacture of complete optical systems can be broken down into three distinct stages; the optical and mechanical design, the production of both optical and mechanical components and finally their assembly and test. The three stages must not be taken in isolation if the system is to fulfil its required optical performance at reasonable cost. This report looks first at the optical design phase. There are a number of different optical design computer packages on the market that optimise an optical system for optical performance. These packages can be used to generate the maximum manufacturin

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30

Matos, Lennia, and Dora Herrera. "Willy Lens (1940 - 2014)." Pontificia Universidad Católica del Perú, 2014. http://repositorio.pucp.edu.pe/index/handle/123456789/100137.

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31

Maytham-Bailey, Sandra. "One lens three views." Master's thesis, University of Cape Town, 2014. http://hdl.handle.net/11427/6844.

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This document explores the complexity of the Zulu Reed Dance in the context of creating a photographic record of the event in various narrative styles within the genre of documentary photography. The authorphotographer acknowledges their subjective contribution in the image making process, and uses this understanding to demonstrate a continuum of subjectivity that operates depending on the visual narrative being constructed. To contextualise the photographers approach, the document explores the social, political and economic landscape, and the dominant visual record produced by media. A quali

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32

Vidarsson, Freysteinn Vidar. "Dual Polarized Geodesic Lens." Thesis, KTH, Skolan för elektroteknik och datavetenskap (EECS), 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-286825.

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Gradient-index (GRIN) lens antennas, such as the Luneburg lens, posses attractive electromagnetic properties. The smooth change in refractive index ensures no internal reflections and the focusing of the electromagnetic waves results in a directive antenna. The main challenge of the design of a GRIN lens is acquiring the required refractive index. Two dimensional dielectric lenses can be realized using 3 dimensional homogeneous surfaces eliminating the challenge of discritizating the continuous change in refractive index. These type of lenses are commonly referred to as geodesic lenses. In thi

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33

Vice, President Research Office of the. "The Lens of Language." Office of the Vice President Research, The University of British Columbia, 2008. http://hdl.handle.net/2429/2669.

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34

McClure, Kate Alexandra. "Tear Film Dynamics Associated with Contact Lens Wear." The Ohio State University, 2018. http://rave.ohiolink.edu/etdc/view?acc_num=osu1523579680091666.

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35

Wang, Zaiqi. "Lens calcium homeostasis and selenite cataract." Diss., This resource online, 1992. http://scholar.lib.vt.edu/theses/available/etd-05042006-164509/.

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36

Ferreira, Daniele Alves. "Reactions using whole cell biocalytic lens culinaris (lentil)." Universidade Federal do CearÃ, 2012. http://www.teses.ufc.br/tde_busca/arquivo.php?codArquivo=8566.

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CoordenaÃÃo de AperfeiÃoamento de Pessoal de NÃvel Superior<br>This paper describes the use of seeds of lentil (Lens culinaris) as intact plant system in biocatalytic reactions of reduction and hydrolysis. Initially, some plant sources were evaluated for their action in the biocatalytic reduction of aromatic ketone acetophenone. The plants that showed positive results in the reduction reaction underwent determination of their protein content by the methods of Lowry and Bradford. Lens culinaris was plant species revealed that most relevant biocatalytic activity, in agreement with their high pro

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37

O'Leary, Christine Marie. "Expression of the Ets family in the lens." Access to citation, abstract and download form provided by ProQuest Information and Learning Company; downloadable PDF file 2.78 Mb., 100 p, 2005. http://wwwlib.umi.com/dissertations/fullcit/1428194.

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38

Tomlinson, Julie. "Calcium in relation to lens physiology and pathology." Thesis, University of East Anglia, 1991. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.292537.

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39

Heistand, Mark Richard. "Biomechanics of the lens capsule." Texas A&M University, 2004. http://hdl.handle.net/1969.1/2726.

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Knowledge of the mechanics of the lens capsule is crucial for improving cataract surgery as well as understanding better the physiological role of the lens capsule in the process of accommodation. Previous research on the mechanical properties of the lens capsule contains many gaps and contradictions due to experimental limitations and inappropriate assumptions. Thus, the goal of this work is to quantify fully the regional, multiaxial mechanical behavior of the lens capsule and to calculate the change in stress and strain fields as a result of cataract surgery. Determining in situ the multi

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40

Banks, Eric A. "Connexin 45.6 in lens development : a dissertation /." San Antonio : UTHSC, 2007. http://proquest.umi.com/pqdweb?did=1400957401&sid=1&Fmt=2&clientId=70986&RQT=309&VName=PQD.

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41

Eom, Youngsub, Dongok Ryu, Dae Wook Kim, et al. "Development of a program for toric intraocular lens calculation considering posterior corneal astigmatism, incision-induced posterior corneal astigmatism, and effective lens position." Springer, 2016. http://hdl.handle.net/10150/621786.

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Background: To evaluate the toric intraocular lens (IOL) calculation considering posterior corneal astigmatism, incision-induced posterior corneal astigmatism, and effective lens position (ELP). Methods Two thousand samples of corneal parameters with keratometric astigmatism >= 1.0 D were obtained using boot-strap methods. The probability distributions for incision-induced keratometric and posterior corneal astigmatisms, as well as ELP were estimated from the literature review. The predicted residual astigmatism error using method D with an IOL add power calculator (IAPC) was compared with tho

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42

Andrulaitytė, Giedrė. "Įstrižojo astigmatizmo kompiuterinis modeliavimas sferiniuose ir asferiniuose lęšiuose." Bachelor's thesis, Lithuanian Academic Libraries Network (LABT), 2014. http://vddb.library.lt/obj/LT-eLABa-0001:E.02~2014~D_20140716_105157-99873.

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Bakalauro darbą „Įstrižojo astigmatizmo kompiuterinis modeliavimas sferiniuose ir asferiniuose lęšiuose“ sudaro įvadas, 5 dėstymo skyriai, išvados ir priedai. Darbe pateikiami 50 paveikslai ir 2 lentelės, cituojami 16 literatūros šaltinių. Darbo apimtis 66 lapai. Darbe apibendrinta literatūra apie lęšių aberacijas, jų įtaką regėjimo kokybei, bei minimalizavimą asferiniais lęšiais. Taip pat pateikiami matematiniai sferinių ir asferinių lęšių modeliai, bei įstrižojo astigmatizmo analizė šiuose lęšiuose. Įvade iškeliami darbo tikslai ir uždaviniai. Pirmajame skyriuje pateikta teorinė medžiaga api

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43

Wang, Kai. "Involvement of O-glcnacylation in lens development and cataract formation." Thesis, Birmingham, Ala. : University of Alabama at Birmingham, 2008. https://www.mhsl.uab.edu/dt/2010r/wang.pdf.

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44

Bassnett, S. "Ion activity and membrane function in the lens." Thesis, University of East Anglia, 1987. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.377710.

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Ferreira, Daniele Alves. "Reações biocatalíticas usando células íntegras de Lens culinaris (Lentilha)." reponame:Repositório Institucional da UFC, 2012. http://www.repositorio.ufc.br/handle/riufc/10915.

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FERREIRA, D. A. Reações biocatalíticas usando células íntegras de Lens culinaris (Lentilha). 2012. 144 f. Tese (Doutorado em Química) - Centro de Ciências, Universidade Federal do Ceará, Fortaleza, 2012.<br>Submitted by José Jairo Viana de Sousa (jairo@ufc.br) on 2014-10-17T19:36:21Z No. of bitstreams: 1 2012_tese_daferreira.pdf: 4506710 bytes, checksum: 94cfd04a00906636065e44839b576c29 (MD5)<br>Approved for entry into archive by José Jairo Viana de Sousa(jairo@ufc.br) on 2015-03-10T22:06:31Z (GMT) No. of bitstreams: 1 2012_tese_daferreira.pdf: 4506710 bytes, checksum: 94cfd04a00906636065e4483

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Rogers, Adam. "Gravitational lens modeling with iterative source deconvolution and global optimization of lens density parameters." Journal of the Royal Astronomical Society of Canada, 2012. http://hdl.handle.net/1993/5283.

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Strong gravitational lensing produces multiple distorted images of a background source when it is closely aligned with a mass distribution along the line of sight. The lensed images provide constraints on the parameters of a model of the lens, and the images themselves can be inverted providing a model of the source. Both of these aspects of lensing are extremely valuable, as lensing depends on the total matter distribution, both luminous and dark. Furthermore, lensed sources are commonly located at cosmological distances and are magnified by the lensing effect. This provides a chance to image

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Sagawa, Atsushi. "New solution for well test analysis in reservoirs with permeability discontinuities." Thesis, Heriot-Watt University, 2000. http://hdl.handle.net/10399/551.

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48

Mital, Rashmi. "Design and demonstration of a novel optical true time delay technique using polynomial cells based on white cells." Connect to this title online, 2005. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=osu1111161542.

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Thesis (Ph. D.)--Ohio State University, 2005.<br>Title from first page of PDF file. Document formatted into pages; contains xiii, 195 p.; also includes graphics (some col.) Includes bibliographical references (p. 190-195). Available online via OhioLINK's ETD Center

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Fisher, Damien. "The influence of scleral lens parameters and fitting characteristics on corneal oedema under open and closed eye conditions." Thesis, Queensland University of Technology, 2021. https://eprints.qut.edu.au/211357/1/Damien_Fisher_Thesis.pdf.

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Scleral lenses are large rigid contact lenses used to treat diseases that affect the front surface of the eye. This thesis examined how scleral lens fitting characteristics can be optimised to reduce corneal tissue swelling. The results provide clinical guidance for contact lens practitioners and patients worldwide.

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Gilligan, Therese M. "Behind the lens : sensorimotor and cognitive after-effects of prism adaptation." Thesis, Bangor University, 2017. https://research.bangor.ac.uk/portal/en/theses/behind-the-lens(fd8b122f-8110-4aa8-ab21-105d476fe0bd).html.

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Over a century of research into prism adaptation (PA) has provided many insights into general sensorimotor functions including plasticity and the role of prediction. More recently, the therapeutic value of PA for conditions relating to right hemisphere dysfunction such as hemispatial neglect, and to body schema related conditions such as complex region pain syndrome, have generated a wealth of new knowledge – and more questions (Chapter 1). This thesis examines a cross-section of PA effects: sensorimotor adaptation in healthy participants and cognitive after-effects in a neurological populatio

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