Accession Number : ADA328748

Title :   Grating Visual Acuity Following Hemorrhagic Foveal Lesions

Descriptive Note : Journal article Mar 89-Mar 92

Corporate Author : KRUG LIFE SCIENCES SAN ANTONIO TX SAN ANTONIO DIV

PDF Url : ADA328748

Report Date : APR 1996

Pagination or Media Count : 14

Abstract : Grating visual acuity was measured in three cases of experimentally produced foveal, hemorrhagic vitreous lesions in rhesus monkeys. A dual-Purkinje-image (DPI) eye-tracker and a modified laser photocoagulator were used to target the laser exposure while the subject was engaged in an operantly trained grating detection task. Each subject received one exposure in the right eye from a Q-switched Nd:glass laser. The resulting vitreous hemorrhage emanated from a disk-shaped area of edema and disrupted tissue; the blood was largely confined to a single, inferiorly directed column, with only slight, diffuse mixing with the vitreous. Grating acuity in the injured eye declined immediately after the laser exposure. During the ensuing 37-day assessment period, acuity returned to the pre-exposure range within 5 to 14 days. The size of the area of retinal injury also decreased over the assessment period, but complications of vitreous clouding and strial traction lines were noted.

Descriptors :   *VISUAL ACUITY, *LESIONS, *HEMORRHAGE, DETECTION, EXPOSURE(GENERAL), TRAINING, ACUITY, LASERS, GRATINGS(SPECTRA), WOUNDS AND INJURIES, MIXING, DIFFUSION, RETINA, EYE, EXPOSURE(PHYSIOLOGY), LASER HAZARDS, BLOOD, RHESUS MONKEYS, GLASS LASERS, VITREOUS STATE, PHOTOCOAGULATORS.

Subject Categories : Anatomy and Physiology
      Medicine and Medical Research

Distribution Statement : APPROVED FOR PUBLIC RELEASE