Eye Controlled Simulation of Scotomas on the Retina
Abstract
Loss of central vision was simulated during a simple monitoring task while the adaptive eye fixation responses were measured in normal subjects. A circularly symmetric simulated scotoma of 2.6 degrees was stabilized on the fovea of 5 normal observers while they attempted to maintain a 20 minute target in clear view. Eccentric eye positioning developed within 2 minutes of viewing time with most subjects. Cumulated fixation positions showed that the edge of the scotoma was positioned next to the target and that mean eccentricity was optimum. All subjects reported that they found an upper right position relative to the target easier to maintain as an eccentric vantage point and fixation maps showed that the majority of fixations were located there. Fixation durations became longer during eccentric viewing practice indicating rapid improvements in fixation stability. Keywords: Scotoma, Visually coupled system, Eccentric fixation, Adaptation, Laser accident.
Document Details
- Document Type
- Technical Report
- Publication Date
- Dec 01, 1988
- Accession Number
- ADA206806
Entities
People
- James H. Bertera
Organizations
- Smith-Kettlewell Eye Research Institute