Accession Number : ADA310716

Title :   Perimetric Mapping of Hyperacuity: Effects of Retinal Laser Scars.

Descriptive Note : Midterm rept. 25 May 95-24 May 96,

Corporate Author : KENTUCKY UNIV RESEARCH FOUNDATION LEXINGTON

Personal Author(s) : Schmeisser, Elmar T.

PDF Url : ADA310716

Report Date : JUN 1996

Pagination or Media Count : 42

Abstract : The effects of specific graded retinal laser lesions on both hyperacuity and local luminance perimetry were measured by electrophysiological means. Animals were used that previously received minimal spot laser exposures from a pulsed neodymium-YAG laser at energies up to and including contained subretinal hemorrhages in both the parafovea and the fovea. In these experiments, a 95% contrast vernier acuity targets were presented at high luminance levels to anesthetized primates. Visual evoked potentials were recorded by conventional means. An additional map of each retina was produced by flickering small patches on the stimulus display and recording the retinal signal. Vernier recording have proven relatively successful in those animals with less than contained retinal hemmorage lesions in the fovea. Animals with such lesions have grossly degraded resolution acuity and no recordable vernier acuity. Retinal and cortical topographic function mapping has to date proven unsuccessful.

Descriptors :   *LASER APPLICATIONS, *RETINA, *EXPOSURE(PHYSIOLOGY), *LESIONS, *NEODYMIUM LASERS, *MEDICAL COMPUTER APPLICATIONS, *EYE DISEASES, YAG LASERS, ACUITY, RESOLUTION, PULSED LASERS, DISPLAY SYSTEMS, SIGNALS, ANIMALS, RECORDING SYSTEMS, STIMULI, PRIMATES, ANESTHESIA, LUMINANCE, FOVEA, VISUAL ACUITY, ELECTROPHYSIOLOGY, HEMORRHAGE, SCARS.

Subject Categories : Anatomy and Physiology
      Medicine and Medical Research
      Lasers and Masers

Distribution Statement : APPROVED FOR PUBLIC RELEASE