Optometry Commons^™

Open Angle Glaucoma Effects On Preattentive Visual Search (Pavs) Efficiency For Flicker, Motion Displacement And Orientation Pop-Out Tasks, James Loughman, Peter Davison, Daniel Ian Flitcroft

Articles

Background/aim: Preattentive visual search (PAVS) describes rapid and efficient retinal and neural processing capable of immediate target detection in the visual field. Damage to the nerve fibre layer or visual pathway might reduce the efficiency with which the visual system performs such analysis. The purpose of this study was to test the hypothesis that patients with glaucoma are impaired on parallel search tasks, and that this would serve to distinguish glaucoma in early cases. Methods: Three groups of observers (glaucoma patients, suspect and normal individuals) were examined, using computer-generated flicker, orientation, and vertical motion displacement targets to assess PAVS efficiency. …

Open Angle Glaucoma Effects On Preattentive Visual Search (Pavs) Efficiency For Flicker, Motion Displacement And Orientation Pop-Out Tasks, James Loughman, Peter Davison, Ian Flitchcroft

Articles

Background/aim: Preattentive visual search (PAVS) describes rapid and efficient retinal and neural processing capable of immediate target detection in the visual field. Damage to the nerve fibre layer or visual pathway might reduce the efficiency with which the visual system performs such analysis. The purpose of this study was to test the hypothesis that patients with glaucoma are impaired on parallel search tasks, and that this would serve to distinguish glaucoma in early cases. Methods: Three groups of observers (glaucoma patients, suspect and normal individuals) were examined, using computer-generated flicker, orientation, and vertical motion displacement targets to assess PAVS efficiency. …

Health Professions Division Catalog 2007-2008, Nova Southeastern University

Health Professions Divisions Course Catalogs and Course Descriptions

No abstract provided.

Population Study Of The Variation In Monochromatic Aberrations Of The Normal Human Eye Over The Central Visual Field, Matthew Sheehan, Alexander Goncharov, Veronica O'Dwyer, Vincent Toal, Christopher Dainty

Articles

Abstract

We present data analysis for ocular aberrations of 60 normal eyes measured with a Hartmann-Shack (HS) wavefront sensor (WFS). Aberration measurements were made on-axis and at 5 degree field angles in the nasal, inferior, temporal and superior semi-meridians. Particular attention is given to aberration distributions and possible strategies for aberration correction are discussed. A versatile HS WFS was designed and constructed with features of simultaneous pupil centre determination, off-axis capability, real-time data displays, and efficient lenslet sampling orientation. The subject alignment is achieved by the use of a parallel channel that is recombined with the sensing channel to simultaneously …

Visionary 2007, College Of Optometry

Visionary

No abstract provided.

Stem Cell Markers In The Posterior Limbus And Cornea, Sara L. Mcgowan

All ETDs from UAB

The corneal endothelium is a layer of cells in the cornea that is responsible for maintaining the clear state of the cornea. Corneal endothelial cells may be induced to divide, but do not regularly divide in the normal cornea of a human beyond the age of twenty. Some studies have suggested that a stem cell population may reside in the pe-ripheral corneal endothelium or in the posterior limbus. Important molecular markers of stem cells are nestin which is expressed in neural crest stem cells; alkaline phosphatase is active in stem cells and not in differentiated cells; telomerase is a marker …

Retinal Pigment Epithelial Cells And The Insulin-Like Growth Factor System In Proliferative Vitreoretinopathy, Sudipto Mukherjee

All ETDs from UAB

The goal of this study was to determine the influence, if any, of the insulin-like growth factors (IGFs) on retinal pigment epithelial (RPE) cell tractional force generation and the contributions of vitreous insulin-like growth factor binding proteins (IGFBPs) towards control of IGF activity. Another objective was to evaluate RPE cells as a potential source of all six high-affinity IGFBPs and to determine if IGFBP biosynthesis is modulated in concert with phenotype changes and growth factor stimuli known to be present in disease. RPE generate tractional forces in response to IGF-I and -II with IGF-I being the more potent stimulus. Differential …

Effects Of Optical Blur On Visual Performance And Comfort Of Computer Users, Ferial M. Zeried

All ETDs from UAB

Background. The study examined the effects of optical blur on the visual performance and comfort of computer workers. Since most workers have significant degrees of optical blur, the study may elucidate improved methodology for workplace comfort and function. Methods. Since young and old workers experience blur from different sources, the study incorporated two different designs. The study examined the correction of optical blur using a randomized, double-blind, placebo-controlled, crossover design. The primary outcomes of the study were visual comfort and productivity. In study one, subjects were required to be 19-35 yrs of age, have at least 0.50D uncorrected refractive error …

Visually Impaired Caregivers: Perspectives From Patient Focus Groups, Bethany Surrey Martinez

All ETDs from UAB

Purpose: We typically think of those with severe visual impairment as having to receive care or assistance for tasks in everyday living. However, with the aging of the population, more persons who are severely visually impaired are now caring for a spouse of significant other. Very little is known about visually impaired (VI) caregivers. Thus, the purpose of this qualitative study is to learn more about this vulnerable population of VI caregivers. Methods: Focus groups and one-on-one interviews were conducted with English speaking adults who were legally blind (U.S. definition) and served as informal caregiver of an adult family member. …