Analysis of Small Vergence Eye-movement in Stereopsis with Random-dot Stereograms

概要

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Recently, random-dot stereograms (RDS) have been widely used as a test of stereopsis. In the present study, we analysed small vergence eye-movement in an RDS test, using an infrared fundus haploscope. Two types of RDS were used: one with a crossed disparity of 14', and another with an uncrossed disparity of the same visual angle. For the RDS with crossed disparity, the angle of convergence changed by approximately 40' when the fixation point moved from the floating central area to the surrounding area. On the other hand, for the RDS with uncrossed disparity, the convergence angle changed by about 25' when the fixation point moved from the recessed central area to the surround. For the strabismic patients, the RDS was presented dichoptically in accord with their angle of squint, and the fusional vergence movement was video-taped. A large portion of the exotropias (50%) were only able to fuse the RDS incompletely, while showing a stereoacuity of better than 80" on the Titmus Circle Test and New Stereo Test. Furthermore, eight subjects from this group (90%) showed a vergence eye-movement defect. These results suggest that fine control of active vergence eye-movement is required for the RDS test.
日本基礎心理学会の論文
1984-09-30