Browsing Optometry and Vision Science by Title
Now showing items 71-90 of 246
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Development of sports-specific classification for Paralympic skiers with visual impairment
(University of Waterloo, 2020-05-28)Introduction: The Paralympic Games are not only a platform for athletes with disabilities to achieve their dreams, but the Games also play a major role in changing societal attitudes towards people with disabilities and ... -
Development of visual acuity and contrast sensitivity in children
(University of Waterloo, 2011-07-11)Purpose: There is little agreement on the age at which visual acuity (VA) and contrast sensitivity (CS) become adult-like. The ultimate purpose of this thesis was to determine whether VA and CS are adult-like at the age ... -
Diabetic retinopathy grading with respect to the segmented lesions
(University of Waterloo, 2022-05-19)One of the leading causes of irreversible vision loss is Diabetic Retinopathy (DR). The International Clinical Diabetic Retinopathy scale (ICDRS) provides grading criteria for DR. Deep Convolutional Neural Networks (DCNNs) ... -
A differential role for the posterior cerebellum in the adaptive control of convergence eye movements
(Elsevier, 2020-02)Introduction The vergence oculomotor system possesses two robust adaptive mechanisms; a fast “dynamic” and a slow “tonic” system that are both vital for single, clear and comfortable binocular vision. The neural substrates ... -
Doppler SD-OCT Blood Flow Analysis and Extraneous Operator Influences
(University of Waterloo, 2014-01-30)Purpose: The RTVue-100 is a new instrument for measuring retinal blood flow (RBF), but image quality needs to be optimized in order for valid blood flow results. The primary aim of this thesis was to assess the presence ... -
Dose-effect autonomic responses to ocular surface stimulation
(University of Waterloo, 2018-04-26)Introduction: The ocular surface is one of the most densely innervated superficial tissues of the human body supplied extensively by autonomic and sensory nerve fibres. Studies have shown that ocular surface sensory neurons ... -
Effect of aging on measures of visual attention using dual tasks and visual search
(University of Waterloo, 2010-01-19)In Canada, as baby boomers age, there will be an increase in the percentage of seniors within the general population (Statistics Canada, 2006). Seniors often have difficulty in performing certain everyday tasks and have ... -
Effect of ambient humidity on the Cochet-Bonnet aesthesiometer
(Springer Nature, 2018-06-19)Purpose: The Cochet–Bonnet (COBO) aesthesiometer is the current standard in corneal sensitivity assessment. This study investigates the influence of ambient room humidity levels on the stimulus force exerted by the ... -
Effect of heterophoria type and myopia on accommodative and vergence responses during sustained near activity in children
(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 ... -
Effect of near adds on the variability of accommodative response in myopic children
(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 ... -
Effect of Reclining on Retinal Thickness in Diabetes
(University of Waterloo, 2015-01-20)Purpose: Previous studies have shown diurnal variation in retinal thickness in patients with diabetic macular edema (DME) over the course of the day but the cause, presence and magnitude of this variation is controversial. ... -
The effect of transcranial direct current stimulation on contrast sensitivity and visual evoked potential amplitude in adults with amblyopia
(Springer Nature, 2016-01-14)Amblyopia is a neurodevelopmental disorder of vision that occurs when the visual cortex receives decorrelated inputs from the two eyes during an early critical period of development. Amblyopic eyes are subject to suppression ... -
Effect of vergence adaptation and positive fusional vergence training on oculomotor parameters
(University of Waterloo, 2008-01-24)Accommodation and vergence, the two important oculomotor systems, exhibit the property of adapation which maintains the response for comfortable prolonged viewing. Several mathematical models have been developed to describe ... -
Effect of vision-based treatments on visual acuity and motor function in children with amblyopia
(University of Waterloo, 2021-08-19)Purpose: To investigate existing as well as novel vision-based treatments in children with amblyopia and determine the utility of motor function as a potential outcome measure. Methods: Three experiments were conducted. ... -
The Effects of 1-(5-Iodonaphthalene-1-sulfonyl)-1H-hexahydro-1,4-diazepine hydrochloride (ML-7) on the Lens During Avian Accommodation In Situ
(University of Waterloo, 2009-12-17)A previous study in chickens revealed that myosin light chain kinase (MLCK), f actin, and myosin are found on the crystalline lens. Their polygonal arrangement at the posterior surface resembles a muscle tissue, which ... -
Effects of ML-7 on the Actomyosin Networks of the Avian Crystalline Lens
(University of Waterloo, 2022-04-29)Assemblies of contractile proteins such as actin, myosin and myosin light chain kinase (MLCK) are found on the posterior surface of the lens fibre cells. The mechanical properties of chicken lenses, as well as their focal ... -
The Effects of tDCS Across the Spatial Frequencies and Orientations that Comprise the Contrast Sensitivity Function
(Frontiers Media, 2015-11-27)Transcranial Direct Current Stimulation (tDCS) has recently been employed in traditional psychophysical paradigms in an effort to measure direct manipulations on spatial frequency channel operations in the early visual ... -
Effects of Temperature on the Proliferation of Human and Fish Lens Epithelial Cells
(University of Waterloo, 2019-08-29)Crystallins are proteins that confer refractive properties to the crystalline lens. All vertebrate lenses contain α- and β-crystallins, and often a third major crystallin. Crystallins can have additional non-refractive ... -
Electrophysiological measures of optic nerve function
(University of Waterloo, 2021-08-26)The contribution of retinal ganglion cells (RGCs) to human electroretinograms (ERGs) is known, but that of chicken (Gallus gallus domesticus) is not clear. This project seeks to determine the effect of RGC dysfunction on ... -
Estimation of Heading direction Using Optic Flow
(University of Waterloo, 2019-08-26)Background The purpose of this study was to investigate the effect of the reduction of the uniocular light luminance as well as the effect of unequal retinal image sizes by using uniocular size lenses, on the heading ...