Abstract

Hyperacuity is described as the ability to perceive a difference in relative spatial localization to the order of seconds of arc (Westheimer 1979). The various hyperacuity tasks include vernier acuity (line vernier, two-dot vernier), stereoacuity and orientation discrimination. It has been shown that hyperacuity is resistant to optical degradation of the retinal image (Enoch et al. 1983 and Williams et al. 1984), therefore, vernier judgements possess potential clinical importance as a test of visual function in patients with opaque media. A recent review of clinical use of hyperacuity is given by Enoch et al. (1985). Further studies on psychophysical hyperacuity tests, the modified vernier gap test and a bisection task test to detect and quantify metamorphopsia are discussed in this paper.

© 1990 Optical Society of America