Now showing items 142-161 of 228

    • Near addition lenses as a tool to investigate vergence adaptation in myopic children 

      Sreenivasan, Vidhyapriya (University of Waterloo, 2011-08-12)
      Accommodation and vergence are two interacting ocular motor systems that function to maintain clear and single vision across a wide range of distances. Sustained fixation results in the adaptation of these ocular motor ...
    • Neonatal Glycemia and Neurodevelopmental Outcomes at 2 Years 

      McKinlay, Christopher J.D.; Alsweiler, Jane M.; Ansell, Judith M.; Anstice, Nicola S.; Chase, J. Geoffrey; Gamble, Gregory D.; Harris, Deborah L.; Jacobs, Robert J.; Jiang, Yannan; Paudel, Nabin; Signal, Matthew; Thompson, Benjamin; Wouldes, Trecia; Yu, Tzu-Ying; Harding, Jane E. (Massachusetts Medical Society, 2015-10-15)
      Neonatal hypoglycemia is a common and readily treatable risk factor for neurologic impairment in children. Although associations between prolonged symptomatic neonatal hypoglycemia and brain injury are well established,1 ...
    • Neural modulation of the human visual cortex 

      Abuleil, Dania (University of Waterloo, 2020-09-30)
      Neuroplasticity is a phenomenon that refers to the brain’s ability to reorganize, strengthen, and form neural connections, a process that becomes increasingly more difficult with age. Gamma amino-butyric acid (GABA), the ...
    • A New Portable Digital Meniscometer 

      Bandlitz, Stefan; Purslow, Christine; Murphy, Paul J.; Pult, Heiko; Bron, Anthony J. (Wolters Kluwer, 2014-01)
      Purpose: The aims of this study were (i) to develop a new portable slit-lamp mounted digital meniscometer (PDM) and (ii) to test its accuracy and repeatability compared to the existing Yokoi et al. videomeniscometer ...
    • Non-invasive brain stimulation of the primary visual cortex of healthy adults and individuals with amblyopia 

      DONKOR, RICHARD (University of Waterloo, 2021-05-03)
      Introduction: Amblyopia is a neurological condition that affects the visual cortex and causes visual deficits, typically in one eye. Recovery from amblyopia requires significant visual cortex neuroplasticity to allow for ...
    • A novel Automatic Optic Disc and Cup Image Segmentation System for Diagnosing Glaucoma using RIGA dataset 

      Almazroa, Ahmed (University of Waterloo, 2016-04-07)
      The optic nerve head (ONH) of the retina is a very important landmark of the fundus and is altered in optic nerve pathology especially glaucoma. Numerous imaging systems are available to capture the retinal fundus and from ...
    • Novel methods for the evaluation of the tear film in the diagnosis of dry eye 

      Keech, Adam John (University of Waterloo, 2010-09-27)
      Dry eye is a complex, multi-factorial disease that results in a compromised tear film and ocular surface. Clinicians and researchers alike have historically relied on an individual’s symptoms to diagnose and manage the ...
    • Objective assessment of Visual acuity in infants 

      Hathibelagal, Amithavikram (University of Waterloo, 2013-08-06)
      Purpose Early detection of abnormal visual acuity (VA) is crucial in the identification and management of ocular and visual abnormalities in infants. Currently, the Teller Acuity Cards (TACs) are considered the gold ...
    • Ocular Discomfort Upon Tear Drying 

      Varikooty, Jalaiah (University of Waterloo, 2003)
      <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 ...
    • Ocular impression-taking - which material is best? 

      Turner, Jennifer; Purslow, Christine; Murphy, Paul J. (Wolters Kluwer, 2019-01)
      Objectives: To assess the efficacy and effect on clinical signs of a polyvinylsiloxane (Tresident; Shütz Dental Group GmbH, Germany) compared with an irreversible hydrocolloid (Orthoprint; Zhermack SpA, Badia Polesine, ...
    • Ocular Perfusion Pressure in Spaceflight-Associated Neuro-Ocular Syndrome 

      Mohiar, Yara (University of Waterloo, 2020-10-26)
      Purpose: Spaceflight associated neuro-ocular syndrome (SANS) is considered by the National Aeronautics and Space Administration (NASA) as one of the most significant barriers to long term space exploration (Larkin, 2018). ...
    • Ocular Surface Sensory Processing and Signal Detection Theory 

      Jayakumar, Varadharajan (University of Waterloo, 2021-09-28)
      Purpose: The main aim of the experiments in this thesis is to evaluate the feasibility of using signal detection theory (SDT) to determine the detectability and bias of various ocular surface pneumatic stimuli. Chapter ...
    • Optimization of Sweep Visually Evoked Potential (sVEP) in Adults 

      Yadav, Naveen Kumar (University of Waterloo, 2008-05-01)
      Purpose and hypothesis: The purpose of this study was to optimize and standardize the following parameters of sweep Visually Evoked Potential (sVEP) in adults: criteria for fitting the regression line to estimate threshold, ...
    • An Optokinetic Nystagmus Detection Method for Use With Young Children 

      Sangi, Mehrdad; Thompson, Benjamin; Turuwhenua, Jason (Institute of Electrical and Electronics Engineers, 2015-03-05)
      The detection of vision problems in early childhood can prevent neurodevelopmental disorders such as amblyopia. However, accurate clinical assessment of visual function in young children is challenging. optokinetic nystagmus ...
    • Overnight Corneal Swelling and Deswelling with Silicone Hydrogel Lenses 

      Moezzi, Amir Mahmoud (University of Waterloo, 2019-12-13)
      Purpose: To compare central corneal swelling (CS) after eight hours of sleep in eyes wearing 12 different silicone hydrogel (SiHy) contact lenses (CLs) and to model between-subject variability in CS and deswelling. Methods: ...
    • Patient compliance with contemporary contact lenses: Impact on successful contact lens wear 

      Dumbleton, Kathryn (University of Waterloo, 2013-04-15)
      Purpose: Contact lens (CL) materials, modalities of wear and replacement, and care systems have changed considerably since the early studies of CL compliance were first conducted. Silicone hydrogel (SiHy) and daily disposable ...
    • Post Stroke Visual Midline Shift Syndrome 

      Binhilabi, Ohwod (University of Waterloo, 2018-10-01)
      Abstract Introduction The definition of an individual’s visual midline is the point which the individual perceives as being straight-ahead or “in front of their nose”. One of the perceptual consequences of a stroke for ...
    • Prenatal exposure to recreational drugs affects global motion perception in preschool children 

      Chakraborty, Arijit; Anstice, Nicola S.; Jacobs, Robert J.; LaGasse, Linda L.; Lester, Barry M.; Wouldes, Trecia; Thompson, Benjamin (Springer Nature, 2015-11-19)
      Prenatal exposure to recreational drugs impairs motor and cognitive development; however it is currently unknown whether visual brain areas are affected. To address this question, we investigated the effect of prenatal ...
    • Preschool children's vision screening in New Zealand: a retrospective evaluation of referral accuracy 

      Langeslag-Smith, Miriam A; Vandal, Alain C; Briane, Vincent; Thompson, Benjamin; Anstice, Nicola S. (BMJ Publishing Group, 2015-11-27)
      Objectives To assess the accuracy of preschool vision screening in a large, ethnically diverse, urban population in South Auckland, New Zealand. Design Retrospective longitudinal study. Methods B4 School Check vision ...
    • Prevalence of Convergence Insufficiency-Type Symptomatology in Parkinson’s Disease 

      Law, Caroline; Chriqui, Estefania; Kergoat, Marie-Jeanne; Leclerc, Bernard-Simon; Panisset, Michel; Irving, Elizabeth L.; Postuma, Ronald B.; Chouinard, Sylvain; Kergoat, Hélène (Cambridge University Press, 2017-09)
      Background: Individuals with Parkinson’s disease (PD) often present with visual symptoms (e.g., difficulty in reading, double vision) that can also be found in convergence insufficiency (CI). Our objective was to estimate ...

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