D_(max) for Stereoscopic Depth Perception with Simulated Monovision Correction.

摘要

Purpose: Persons who wear monovision correction typically receive a clear image in one eye and a blurred image in the other eye. Although monovision is known to elevate the minimum stereoscopic threshold (D_(min)). it is uncertain how it influences the largest binocular disparity for which the direction of depth can reliably be perceived (D_(max)). In this study, we compared D_(max) for stereo when one eye's image is blurred to D_(max) when both eyes' images are either clear or blurred. Methods: The stimulus was a pair of vertically oriented, random-line patterns. To simulate monovision correction with +1.5 or +2.5 D defocus, the images of the line patterns presented to one eye were spatially low-pass filtered while the patterns presented to the other eye remained unfiltered. Results: Compared to binocular viewing without blur, D_(min) is elevated substantially more in the presence of monocular than binocular simulated blur. D_(max) is reduced in the presence of simulated monocular blur by between 13 and 44%, compared to when the images in both eyes are clear. In contrast, when the targets presented to both eyes are blurred equally, D_(max) either is unchanged or increases slightly, compared to the values measured with no blur. Conclusion: In conjunction with the elevation of D_(min), the reduction of D_(max) with monocular blur indi-cates that the range of useful stereoscopic depth perception is likely to be compressed in patients who wear monovision corrections. [ABSTRACT FROM AUTHOR]