Dilation of pupil has been a major component diagnostic eye examination inOptometric practice. Although mydriatic agents are used in clinical procedures, thereis no satisfactory explanation for the preference one over another. This studycompared dilating effect three different on dark irides ofninety healthy subjects; comprising 48 males and 42 females aged 16-30 (mean age18.77±0.52) years divi...

PURPOSE To determine the visual characteristics of Japanese subjects with the Waardenburg syndrome type 2. METHODS The visual functions of 11 albino patients who were identified from the screening of 240 children attending a school for children with a hearing deficit were studied. The ophthalmological examinations included eye position, visual acuity, biomicroscopy, ophthalmoscopy, visual fie...

To the ancient Greeks, glaukos occasionally described diseased eyes, but more typically described healthy irides, which were glaucous (light blue, gray, or green). During the Hippocratic period, a pathologic glaukos pupil indicated a media opacity that was not dark. Although not emphasized by present-day ophthalmologists, the pupil in acute angle closure may appear somewhat green, as the mid-di...

PURPOSE To assess objective and subjective methods to measure accommodation in a young human population. SETTING Research laboratory, University of Houston, College of Optometry, Houston, Texas, USA. METHODS Accommodation was measured in the right eye of 15 young subjects (9 women and 6 men) whose ages ranged from 23 to 28 years and 1 36-year-old subject. The mean age of all subjects was 26...

PURPOSE To determine the mydriatic regimen that provides optimal dilation of the pupil with minimal systemic side effects for screening of retinopathy of prematurity. METHODS This cross-sectional, randomized, double-masked clinical trial compared cyclopentolate 1% + phenylephrine 2.5%, tropicamide 1% + phenylephrine 2.5%, and a prepared combination of cyclopentolate 0.2% with phenylephrine 1%...

BACKGROUND Reports of the use of brainstem auditory evoked response (BAER) as a diagnostic modality in foals have been limited. HYPOTHESIS/OBJECTIVES To describe BAER findings and associated causes of hearing loss in foals. ANIMALS Study group 18 foals (15 neonatal, 3 nonneonatal), control group (5 neonatal foals). METHODS Retrospective. BAER records from the Clinical Neurophysiology Labo...

PURPOSE We report the postoperative results of the Artisan Hyperopia phakic intraocular lens (IOL; model 203W; Ophtec, Groningen, The Netherlands). DESIGN Prospective, nonrandomized trial. PARTICIPANTS Twenty-six eyes of 13 self-selected patients with refractive error ranging from +3.00 to +11.00 diopters (D). INTERVENTION Patients with hypermetropia were implanted with the Artisan Hypero...

We investigated the randomness and uniqueness of human iris patterns by mathematically comparing 2.3 million different pairs of eye images. The phase structure of each iris pattern was extracted by demodulation with quadrature wavelets spanning several scales of analysis. The resulting distribution of phase sequence variation among different eyes was precisely binomial, revealing 244 independen...