Three-dimensional visual stimulator
- 1 February 1995
- journal article
- Published by Optica Publishing Group in Applied Optics
- Vol. 34 (4), 732-738
- https://doi.org/10.1364/ao.34.000732
Abstract
We describe a newly developed three-dimensional visual stimulator (TVS) that can change independently the directions, distances, sizes, luminance, and varieties of two sets of targets for both eyes. It consists of liquid crystal projectors (LCP’s) that generate the flexible images of targets, Badal otometers that change target distances without changing the visual angles, and relay-lens systems that change target directions. A special control program is developed for real-time control of six motors and two LCP’s in the TVS together with a three-dimensional optometer III that simultaneously measures eye movement, accommodation, pupil diameter, and head movement. The TVS measurement ranges are as follows: distance, 0 to −20 D; direction, ±16° horizontally and ±15° vertically; size, 0–2° visual angle; and luminance, 10−2–102 cd/m2. The target images are refreshed at 60 Hz and speeds with which the target makes a smooth change (ramp stimuli) are as follows: distance, 5 D/s; direction, 30°/s, size, 10°/s. A simple application demonstrates the performance.This publication has 8 references indexed in Scilit:
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