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

Fernández EJ, Schwarz C, Prieto PM, Manzanera S, Artal P - Biomed Opt Express (2013)

Bottom Line: 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 micro-monovision 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.

View Article: PubMed Central - PubMed

Affiliation: Laboratorio de Óptica, Instituto Universitario de investigación en Óptica y Nanofísica, Universidad de Murcia, Campus de Espinardo (Edificio 34), E-30100 Murcia, Spain.

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 micro-monovision 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.

No MeSH data available.


Related in: MedlinePlus

Stereoacuity obtained as the average across subjects of the retinal disparity producing 75% of far responses, calculated from the psychometric fitted curve for each subject and condition.
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g003: Stereoacuity obtained as the average across subjects of the retinal disparity producing 75% of far responses, calculated from the psychometric fitted curve for each subject and condition.

Mentions: In order to obtain the stereoacuity under each studied condition, the value of 75% of right answers was selected in negative retinal disparities to determine the threshold of detection. This procedure was systematically applied on the fitted sigmoid curves obtained from the average data. The results are depicted in Fig. 3Fig. 3


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

Fernández EJ, Schwarz C, Prieto PM, Manzanera S, Artal P - Biomed Opt Express (2013)

Stereoacuity obtained as the average across subjects of the retinal disparity producing 75% of far responses, calculated from the psychometric fitted curve for each subject and condition.
© Copyright Policy - open-access
Related In: Results  -  Collection

Show All Figures
getmorefigures.php?uid=PMC3675862&req=5

g003: Stereoacuity obtained as the average across subjects of the retinal disparity producing 75% of far responses, calculated from the psychometric fitted curve for each subject and condition.
Mentions: In order to obtain the stereoacuity under each studied condition, the value of 75% of right answers was selected in negative retinal disparities to determine the threshold of detection. This procedure was systematically applied on the fitted sigmoid curves obtained from the average data. The results are depicted in Fig. 3Fig. 3

Bottom Line: 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 micro-monovision 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.

View Article: PubMed Central - PubMed

Affiliation: Laboratorio de Óptica, Instituto Universitario de investigación en Óptica y Nanofísica, Universidad de Murcia, Campus de Espinardo (Edificio 34), E-30100 Murcia, Spain.

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 micro-monovision 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.

No MeSH data available.


Related in: MedlinePlus