Browsing Optometry and Vision Science by Title
Now showing items 30-49 of 247
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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 ... -
Can current models of accommodation and vergence predict accommodative behavior in myopic children?
(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 ... -
Can kynurenic acid cause myelin loss in chicken optic nerves?
(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 ... -
Cell death and proliferation characteristics of the retina after optic nerve section in chickens
(University of Waterloo, 2013-09-27)Optic nerve section (ONS) is an experimental model for damage of the optic nerve associated with diseases such as glaucoma and optic neuritis. Damage to the optic nerve causes loss of retinal ganglion cells that are ... -
Cellular changes at the lid margin
(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 ... -
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 ... -
Central Visual Field Assessment in Late Stage Glaucoma
(University of Waterloo, 2006)Glaucoma is defined as a progressive optic neuropathy, characterized by loss of visual function and often associated with high intra-ocular pressure. Testing the patients' visual function with Standard Automated Perimetry ... -
Changes in corneal thickness in keratoconic eyes with variation in scleral contact lens central clearance
(University of Waterloo, 2021-08-30)Purpose: There has been a resurgence of scleral lens wear, particularly for patients with corneal ectasia, such as keratoconus. This method of lens correction provides good visual acuity for these individuals and is often ... -
Characterization of Lipid Deposition on Contact Lenses
(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 ... -
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 ... -
The combined effects of benzalkonium chloride and ultraviolet radiation on the bovine lens in vitro
(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 ... -
Comparative Clinical Performance of Scleral Lenses with Varying Limbal Clearance in a Keratoconic Population
(University of Waterloo, 2019-05-10)PURPOSE The purpose of this study is to investigate the impact varying the limbal clearance (LC) has on the clinical performance of scleral lenses and the levels of inflammatory mediators in the tear film of keratoconic ... -
Comparison of a new portable digital meniscometer and optical coherence tomography in tear meniscus radius measurement
(Wiley, 2013-10-07)Purpose: Non-invasive measurement of tear meniscus radius (TMR) is useful in the assessment of tear volume for dry eye diagnosis. This study investigates the agreement between a new, portable, slit-lamp mounted, digital ... -
Comparison of meibomian gland dropout using two infrared imaging devices
(Elsevier, 2018-11-07)Purpose To measure the degree of meibomian gland (MG) dropout in the lower eyelid determined by analysis of images obtained from the LipiView II (LVII) and the Keratograph 5M (K5M). Methods The inferior eyelid of each ... -
Comparison of super-resolution algorithms applied to retinal images
(Society of Photo Optical Instrumentation Engineers, 2014-05-01)A critical challenge in biomedical imaging is to optimally balance the trade-off among image resolution, signal-to-noise ratio, and acquisition time. Acquiring a high-resolution image is possible; however, it is either ... -
Composition of incubation solution impacts in vitro protein uptake to silicone hydrogel contact lenses
(Molecular Vision, 2012-02-04)Purpose: To determine the impact of incubation solution composition on protein deposition to silicone hydrogel (SH) contact lenses using a simplistic and a complex model of the tear film. Methods: Three SH materials – ... -
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 ...