Now showing items 163-182 of 249

    • 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 ...
    • The Optometric Management of Concussion 

      Yeboah, Anne Marie (University of Waterloo, 2022-01-31)
      Traumatic brain injury is a major public health problem that affects millions of people annually and hundreds of people experience brain injury daily. Many of these individuals develop visual symptoms. Optometrists play a ...
    • Optometry Outreach in Indigenous Communities in British Columbia, Saskatchewan, and Manitoba 

      Warren, Adrianna (University of Waterloo, 2023-08-31)
      Introduction: Inuit, Métis, and First Nations, the three main Indigenous groups within Canada, face disproportionate barriers to access for primary eye and vision care. Optometrists visit rural and remote Indigenous ...
    • 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 ...
    • The Phenotype of Tear Neutrophils and Their Role in Ocular Homeostasis and Inflammation 

      Jin, Yutong (University of Waterloo, 2023-07-31)
      Introduction: Neutrophils (polymorphonuclear neutrophils, PMNs) are part of the innate immune system with potent killing mechanisms against pathogens. Although the anterior segment of the eye has a unique characteristic, ...
    • 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 ...
    • Protein Deposition and Bacterial Adhesion to Conventional and Silicone Hydrogel Contact Lens Materials 

      Nagapatnam Subbaraman, Lakshman (University of Waterloo, 2009-04-27)
      Introduction Contact lenses suffer from the same problems of deposition that other biomaterials exhibit, being rapidly coated with a variety of proteins, lipids and mucins. The first event observed at the interface between ...
    • Protein sorption to contact lenses and intraocular lenses 

      Luensmann, Doerte (University of Waterloo, 2009-12-22)
      Purpose: To locate protein sorption on the surface and inside the matrix of soft contact lens materials and intraocular lenses (IOL). Methods: The proteins albumin and lysozyme were investigated as they are highly ...
    • Protocol development for reliable isolation of tear-film neutrophils and in vitro functionality testing 

      Jin, Yutong (University of Waterloo, 2019-09-19)
      During prolonged eye closure, such as during sleep, leukocytes are recruited to the ocular surface, with polymorphonuclear neutrophils (PMNs) representing the largest population. PMNs are essential inflammatory cells ...
    • Psychophysical and Clinical Investigations of Ocular Discomfort 

      Basuthkar Sundar Rao, Subam (University of Waterloo, 2012-09-26)
      Purpose To investigate ocular surface sensations, specifically ocular discomfort using psychophysical and clinical techniques. The measurement of discomfort on the ocular surface has been limited to the use of traditional ...


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