Optometry Commons^™

Convergence And Divergence Of Opinion About Treatment Of Binocular Vision Disorders Among Vision Care Professionals, Sonia Young

Dissertations

There are three distinct professions prominent in the field of pediatric vision care. They are ophthalmology, optometry and orthoptics. All professions are integral to the detection and treatment of pediatric binocular vision disorders. However, distinct schools of thought exist to describe the best approach to pediatric binocular vision disorders and their treatments. Literature often highlights two opposing schools of thought represented by the “medical” and “behavioral” approaches. While there is academic debate about the merits and pitfalls of either approach, there is a paucity of nuanced perspectives which more closely resemble the ways in which pediatric ocular clinicians approach diagnosis …

The Interplay Of Accommodation And Oculomotor Vergence Within Young Adults With Binocularly Normal Vision And Typically-Occurring Convergence Insufficiency, Sebastian Fine

Dissertations

Concerted binocular coordination evoking oculomotor and refractive responses to visual stimuli are essential to daily function. Oculomotor dysfunctions can inhibit binocular responses to visually-near stimuli and have high comorbidities to accommodative dysfunctions. Three visual cues for inward (convergent) and outward (divergent) oculomotor movements, when presented concertedly create natural-viewing conditions: disparity- the binocular difference in light cast onto the fovea due to differing ocular perspectives, blur- the acuity of a visual target which stimulates accommodation, and proximal- the perceived distance of a visual stimuli based on size.

This study aims to quantitatively investigate oculomotor vergence and accommodation performances between individuals with …

Eye Care Protocol In Critically Ill Pediatric Patients On Neuromuscular Blockage, Jinnie Tkach

Dissertations

Abstract

Problem: Patients admitted to the pediatric intensive care unit (PICU) are at increased risk for the development of ocular surface disease (OSD) due to impaired ocular mechanisms while intubated, sedated, and on continuous neuromuscular blockade. The purpose of this project is to prevent OSD and vision impairments by increasing the frequency of eye care in accordance with a PICU eye care protocol.

Methods: An observational descriptive study was conducted utilizing retrospective and prospective chart review. Comparisons were drawn between the 2021 pre intervention group and the 2022 post intervention group regarding the impact of linking lubricating eye ointment orders …

Preventing Ocular Surface Disease In The Pediatric Intensive Care Unit, Emily Mallette

Dissertations

Preventing Ocular Surface Disease in the Pediatric Intensive Care Unit

Problem: Ocular surface disease in the Pediatric Intensive Care Unit is a significant problem in intubated patients due to altered eye protective mechanics, leading to exposure of the eye surface and dry eye. The purpose of this quality improvement project was to evaluate how an eye care protocol affected the frequency of artificial tear ointment administration.

Method: A descriptive, cohort design utilizing a retrospective chart review with convenience sampling of intubated children in the PICU from two cohorts was used. Comparisons were made between the preintervention cohort in 2020 and …

The Relationship Of An Ipad, A Video Magnifier, And Large Print Text With Oral Reading Outcomes For Children With Low Vision, Rosemary L. Nave Stawasz

Dissertations

Low vision may cause a decrease in visual performance and interfere with daily functioning, especially reading print or text materials. Reading standard text can be particularly challenging for students with low vision in an educational setting and can reduce oral reading rates. Students with low vision may use large print or low vision devices for reading. Limited evidence currently exists to compare oral reading outcomes across various reading media for children with low vision.

The purpose of this exploratory project was to examine oral reading rate, fluency, and comprehension among children with low vision when using an iPad, a video …

Visual Impairment And Factors Associated With Difficulties With Daily Tasks, Anne T. Riddering

Dissertations

In the past 10 years, the number of American adults with visual impairments has increased from 1 million to 4 million and is expected to double to 8 million people by the year 2050 (The Eye Diseases Prevalence Research Group, 2004; National Eye Institute, 2013). Therapies to treat retinal diseases causing visual impairment, such as diabetic retinopathy and age-related macular degeneration (Massof, 2002; Mogk, 2011), have evolved in the past two decades (Gupta et al., 2013; Hooper & Guymer, 2003), but little research has examined recent population and difficulties with performing daily activities. Different types of professionals, including ophthalmologists, optometrists, …

Spatial Mapping Of Macular Pigment Optical Density And Its Relationship To Contrast Sensitivity And Glare Disability, Christopher Michael Putnam

Dissertations

This dissertation explored the relationship of the macular pigment optical density (MPOD) spatial profile with measures of contrast sensitivity (CS), glare disability (GD), relative glare disability (RGD) and intraocular light scatter. A novel device capable of measuring MPOD across the central 16 degrees of retina along 8 principle meridians using customized heterochromatic flicker photometry (cHFP) at eccentricities of 0, 2, 4, 6 and 8 degrees was built. MPOD was calculated as both discrete and integrated values at all measured retinal loci. CS was measured using vertical grating stimuli of 3, 6 and 9 cycles per degree (cpd) also presented at …

Temporal Characteristics Of Monoptic, Dichoptic And Half-Binocular Collinear Lateral Masking Of Contrast Detection, Wesley Tod Kinerk

Dissertations

Purpose: The temporal characteristics of dichoptic contrast integration across space in primary visual cortex are relatively unknown. This study investigated the effect of varying interstimulus interval (ISI) and flank duration on contrast detection threshold (CDT) of a sinusoid target under monoptic, dichoptic and half-binocular viewing. Methods: Eleven subjects with normal vision participated for a mean of 25 hours each. In the main experiment, target and flanks were 3 cpd vertical sinusoids with 6 lambda (sigma = 1.5 lambda) center-to-center vertical separation. Flank contrast was normalized to 3X flank CDT. Flanks were presented at 4 durations (67-500ms) and ISIs were presented …

Gender And Ovarian Hormone Effects On The Relative Contribution Of Chromaticity To Brightness, Brian Keith Foutch

Dissertations

PURPOSE: The chromatic contribution to brightness perception was compared in males and females. METHODS: Direct brightness matching (DBM) and heterochromatic flicker photometry (HFP) were used to measure relative luminous efficiency, and DBM/HFP ratios were predicted to be higher for females than males on repeated measures and for each "primary" color. No gender differences were predicted in DBM or HFP measures. Within-females effects of estradiol (E2) and progesterone (PG) levels, contraceptive use, and menstrual cycle phase were also investigated. It was expected that E2 would directly predict DBM/HFP ratios and that PG would antagonize that relationship. Based on that prediction, DBM/HFP …