Now showing items 21-40 of 197

    • The adaptive elements of disparity vergence: Dynamics and directional asymmetries. 

      Erkelens, Ian (University of Waterloo, 2018-04-24)
      Vergence eye movements alter the angle between the two visual axes, creating changes in binocular fixation distance. They are primarily stimulated by retinal image disparities, but can also be driven by inputs from ocular ...
    • The combined effects of benzalkonium chloride and ultraviolet radiation on the bovine lens in vitro 

      Rossy, Jordan (University of Waterloo, 2018-04-23)
      Purpose: To determine the combined effects of benzalkonium chloride (BAK) and ultraviolet radiation (UV) using the primary culture of intact bovine lenses. Methods: Abattoir-provided lenses were dissected from the eyes ...
    • Contact Lenses and Tear Film Lipids. 

      Walther, Hendrik (University of Waterloo, 2017-12-20)
      Introduction Lipids are essential tear components that aid the stability of the tear film (TF) to protect it from excess evaporation. The composition, conformation, and function of TF lipids are jeopardized by external ...
    • Cellular changes at the lid margin 

      Muntz, Alex (University of Waterloo, 2017-11-28)
      PURPOSE: The hypothesis underlying this thesis is that CL wear, lid wiper epitheliopathy (LWE), and symptoms of dryness and discomfort may be manifest as cellular changes of the lid marginal epithelium, as a result of ...
    • The correction of static and dynamic aniseikonia with spectacles and contact lenses 

      McNeill, Suzanne; Bobier, William (Wiley, 2017-02-16)
      We describe a case of where significant anisometropic astigmatism was accompanied with considerable asthenopic symptoms. Symptoms were not alleviated by the prescribing of a partial spectacle correction. Subsequent treatment ...
    • Investigation of vision strategies used in a dynamic visual acuity task 

      Yee, Alan (University of Waterloo, 2017-10-24)
      Purpose: Dynamic visual acuity (DVA), the ability to resolve fine details of a moving target, requires spatial resolution and accurate oculomotor control. Individuals who engage in activities in highly dynamic visual ...
    • Understanding the sensory and motor behavior of accommodation in progressive myopic children 

      Labhishetty, Vivek (University of Waterloo, 2017-09-27)
      Introduction: Accommodation and vergence, in unison, help in maintaining a clear and single binocular vision, a linchpin for normal vision development. Under natural viewing conditions, accommodation and vergence systems ...
    • Can kynurenic acid cause myelin loss in chicken optic nerves? 

      Gurdita, Akshay (University of Waterloo, 2017-09-27)
      Kynurenic acid (KYNA) is one of many kynurenine intermediate products in the tryptophan metabolism pathway and has been shown to have neuro-activity. Previous work revealed that prolonged infusion of a high dose of KYNA ...
    • Understanding the Mechanisms Underlying Brain Plasticity in Adult Humans 

      Abuleil, Dania (University of Waterloo, 2017-09-22)
      Purpose: The human brain changes signi cantly with age. The plasticity of the visual cortex is thought to decrease into adulthood while childrens' brains are highly plastic. This change in plasticity is thought to be due, ...
    • Global motion perception is associated with motor function in 2-year-old children 

      Thompson, Benjamin; McKinlay, Christopher J.D.; Chakraborty, Arijit; Anstice, Nicola S; Jacobs, Robert J.; Paudel, Nabin; Yu, Tzu-Ying; Ansell, Judith M.; Wouldes, Trecia; Harding, Jane E. (Elsevier, 2017-09-29)
      The dorsal visual processing stream that includes V1, motion sensitive area V5 and the posterior parietal lobe, supports visually guided motor function. Two recent studies have reported associations between global motion ...
    • Characterization of Lipid Deposition on Contact Lenses 

      Qiao, Han (University of Waterloo, 2017-08-30)
      The purpose of this thesis was to evaluate the influence of lipid deposition on silicone hydrogel contact lens materials and to construct an in vitro platform to further explore the effect of lipid interaction with contact ...
    • The TFOS Dry Eye Workshop II: Executive Summary 

      Craig, Jennifer P.; Nelson, J. Daniel; Azar, Dimitri T.; Belmonte, Carlos; Bron, Anthony J.; Chauhan, Sunil K.; de Paiva, Cintia S.; Gomes, José A.P.; Hammitt, Katherine M.; Jones, Lyndon W.; Nichols, Jason J.; Nichols, Kelly K.; Novack, Gary D.; Stapleton, Fiona J.; Willcox, Mark D. P.; Wolffsohn, James S.; Sullivan, David A. (Elsevier, 2017-08-07)
      This article presents an Executive Summary of the conclusions and recommendations of the 10-chapter TFOS DEWS II report. The entire TFOS DEWS II report was published in the July 2017 issue of The Ocular Surface. A downloadable ...
    • Binocular vision and fixational eye movements 

      Nallour Raveendran, Rajkumar (University of Waterloo, 2017-07-19)
      Introduction In observers with amblyopia, abnormal patterns of amblyopic eye (AME) fixational eye movements (FEM) have been associated with monocular (reduced amblyopic eye visual acuity) and binocular sensory deficits ...
    • Stereocoherence thresholds as a measure of global stereopsis 

      Unnisa Begum, Viquar (University of Waterloo, 2017-06-14)
      Purpose: The purpose of this study was to develop a robust and reliable clinical test of stereopsis that is complementary to the conventional disparity threshold tests. Methods: Random dot stereograms containing ...
    • Visual correlates of balance and mobility in older adults: Can visual attention training improve performance? 

      Althomali, Mohammed (University of Waterloo, 2017-05-11)
      Falls among older adults is a serious problem facing our aging population. It is estimated that one in every three older adults aged 70+ fall every year; some of these experience multiple falls. Thirty five percent of ...
    • Binocular Adaptation to +2 D Lenses in Myopic and Emmetropic Children: 

      Sreenivasan, Vidhyapriya; Irving, Elizabeth; Bobier, William (Wolters Kluwer, 2009-06)
      Purpose. To compare vergence adaptation to +2 D addition lenses in myopic and emmetropic children and to evaluate the influence of the accommodative-vergence crosslink (AC/A ratio) on this adaptation. Methods. Nine ...
    • Effect of near adds on the variability of accommodative response in myopic children 

      Sreenivasan, Vidhyapriya; Irving, Elizabeth; Bobier, William (Wiley, 2011-03)
      Purpose: Higher variability of accommodative response (VAR) has been reported in myopes and speculated to be a possible risk factor for the progression of myopia. We investigated whether near adds of +2D and −2D were capable ...
    • Can current models of accommodation and vergence predict accommodative behavior in myopic children? 

      Sreenivasan, Vidhyapriya; Irving, Elizabeth; Bobier, William (Elsevier, 2014-08)
      Investigations into the progression of myopia in children have long considered the role of accommodation as a cause and solution. Myopic children show high levels of accommodative adaptation, coupled with accommodative lag ...
    • Binocular adaptation to near addition lenses in emmetropic adults 

      Sreenivasan, Vidhyapriya; Irving, Elizabeth; Bobier, William (Elsevier, 2008-05)
      Near addition lenses are prescribed to pre-presbyopic individuals for treatment of binocular motor problems such as convergence excess and to control the progression of myopia. To date, no investigation has looked at the ...
    • Effect of heterophoria type and myopia on accommodative and vergence responses during sustained near activity in children 

      Sreenivasan, Vidhyapriya; Irving, Elizabeth; Bobier, William (Elsevier, 2012-03-15)
      The influence of phoria-type and myopia on changes to vergence and accommodation during prolonged near-task was examined in 53 children. Participants were classified into phoria and refractive categories based on near ...

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