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Impact on stereo-acuity of two presbyopia correction approaches: monovision and small aperture inlay

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ABSTRACT:

Some of the different currently applied approaches that correct presbyopia may reduce stereovision. In this work, stereo-acuity was measured for two methods: (1) monovision and (2) small aperture inlay in one eye. When performing the experiment, a prototype of a binocular adaptive optics vision analyzer was employed. The system allowed simultaneous measurement and manipulation of the optics in both eyes of a subject. The apparatus incorporated two programmable spatial light modulators: one phase-only device using liquid crystal on silicon technology for wavefront manipulation and one intensity modulator for controlling the exit pupils. The prototype was also equipped with a stimulus generator for creating retinal disparity based on two micro- displays. The three-needle test was programmed for characterizing stereo-acuity. Subjects underwent a two-alternative forced-choice test. The following cases were tested for the stimulus placed at distance: (a) natural vision; (b) 1.5 D monovision; (c) 0.75 D monovision; (d) natural vision and small pupil; (e) 0.75 D monovision and small pupil. In all cases the standard pupil diameter
was 4 mm and the small pupil diameter was 1.6 mm. The use of a small aperture significantly reduced the negative impact of monovision on stereopsis. The results of the experiment suggest that combining micromonovision with a small aperture, which is currently being implemented as a corneal inlay, can yield values of stereoacuity close to those attained under  normal binocular vision.

©2013 Optical Society of America

OCIS codes: (010.1080) Active or adaptive optics; (330.1400) Vision – binocular and
stereopsis.

 

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URL:

http://www.opticsinfobase.org/boe/abstract.cfm?uri=boe-4-6-822