Browsing Science (Faculty of) by Subject "Vision Science"
Now showing items 1-20 of 70
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Adaptation to near addition lenses - Effect of AV/A ratio and age
(University of Waterloo, 2007-05-17)AIM: The primary purpose of this thesis was to evaluate the pattern of changes to accommodation and phoria when pre-presbyopic individuals perform near work for 20 minutes with +2D lenses. In addition, the thesis also ... -
The appearance of hyper-reflective superficial epithelial cells observed using in vivo confocal microscopy
(University of Waterloo, 2010-01-22)Purpose: Hyper-reflective superficial cells were an unexpected finding while examining the corneal epithelium using confocal microscopy (CM), during an MSc thesis conducted in 2006 at the University of Waterloo, Canada. ... -
The Application of Digital Filters to Improve Visibility for People with Maculopathy
(University of Waterloo, 2007-09-28)Purpose: Previous studies have shown that some digital filters can enhance picture-image visibility for people with visual impairment. The ultimate purposes of this study are to determine the improvement of picture-image ... -
Aspects of Dynamic Anterior Surface Aberrations
(University of Waterloo, 2014-01-07)Introduction: The measurement of tear film stability/regularity is very critical in the diagnosis of dry eye. The tear breakup time, which is used as a diagnostic tool in diagnosing dry eye, is very subjective in nature ... -
Bifocals in children with Down syndrome (BiDS)
(University of Waterloo, 2010-07-28)Down syndrome (DS) is the most common genetic cause of mental challenge in individuals and is associated with many ocular disorders. One of these anomalies which is frequently present in this population is reduced accommodation ... -
Calibration and validation the Dynamic Photorefraction System (DPRS)
(University of Waterloo, 2014-09-25)Introduction: Our group has been measuring accommodation in myopic children. The instrument of choice has been the Power Refractor (Multichannel Systems). However, this instrumentation is no longer supported and runs on ... -
Central and Peripheral Cornea and Corneal Epithelium Characterized Using Optical Coherence Tomography and Confocal Microscopy
(University of Waterloo, 2008-05-22)Abstract Both in the closed and open eye state the superior limbus is covered by the upper lid. This region is of physiological interest and clinical importance because in chronic hypoxia, neovascularization of the ... -
CLINICAL AND ANALYTICAL STUDIES IN POSTMENOPAUSAL WOMEN SYMPTOMATIC OF DRY EYE
(University of Waterloo, 2008-05-22)Introduction Menopause which is defined as a permanent physiological, or natural, cessation of menstrual cycle, plays an important role in the development of ocular surface dryness symptoms and there is an increased ... -
Colour discrimination thresholds and acceptability ratings using simulated Microtile displays.
(University of Waterloo, 2011-10-03)Introduction Nearly all flat panel video display monitors have luminance and colour variations as the angle of view varies from the monitor’s perpendicular. The new MicrotileTM displays developed by Christie Digital are ... -
Colour Vision Test for Railway Dispatchers
(University of Waterloo, 2009-04-29)Introduction Colour codes are used extensively in railways to convey specific information governing movement of trains and equipment on the track. One such task is the railway traffic control display that uses colour coded ... -
A Computational Model for Predicting Visual Acuity from Wavefront Aberration Measurements
(University of Waterloo, 2009-09-14)The main purpose of this thesis is to create and validate a visual acuity model with experimentally obtained aberrations of human eyes. The other motivation is to come up with a methodology to objectively predict the ... -
Computerized and Non-Computerized Colour Vision Tests
(University of Waterloo, 2014-08-05)Introduction: Measuring colour discrimination of people who carry out tasks where colour is used to convey information and accurate colour judgments are essential for safe and efficient performance of the task is important ... -
Contact lens fitting characteristics and comfort with silicone hydrogel lenses
(University of Waterloo, 2012-02-24)Purpose To examine soft contact lens fitting characteristics using anterior segment imaging techniques and comfort. The specific aims of each chapter are as follows: Chapter 2: To calibrate the new ZEISS VisanteTM ... -
Contact Lenses for Ciprofloxacin Drug Delivery
(University of Waterloo, 2014-07-31)PURPOSE The purpose of this thesis was to evaluate the potential of contact lenses as ciprofloxacin drug delivery devices. METHODS Investigations into ciprofloxacin uptake and release characteristics, and the possibility ... -
Development and application of a new Attended Field of View (AFOV) test
(University of Waterloo, 2010-05-21)Purpose: An important challenge for eye care practitioners is meeting the needs of an ever-increasing elderly population. Standard vision tests are inadequate for determining performance in real life situations. One test ... -
Development of Novel Techniques for Measuring Bulbar Conjunctival Red Blood Cell Velocity, Oximetry and Redness
(University of Waterloo, 2009-04-29)Introduction The ocular surface provides a unique opportunity to study hemodynamics since the vessels can be visualized directly, without treatment and non-invasively. The availability of instruments to measure various ... -
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 ... -
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 ... -
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 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. ...