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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

Schematic diagram of the binocular adaptive optics visual simulator showing the main components. The setup includes a single Hartmann-Shack wavefront sensor and a single correcting device for measurement and manipulation of aberrations from the two eyes. The system incorporates two microdisplays for producing retinal disparity, therefore creating stereopsis.
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g001: Schematic diagram of the binocular adaptive optics visual simulator showing the main components. The setup includes a single Hartmann-Shack wavefront sensor and a single correcting device for measurement and manipulation of aberrations from the two eyes. The system incorporates two microdisplays for producing retinal disparity, therefore creating stereopsis.

Mentions: A binocular adaptive optics visual analyzer [24] was developed to perform the experiment. The apparatus was a modified version of one described elsewhere [28]. The system was able to measure and manipulate ocular aberrations from the two eyes simultaneously, while the subject performed visual testing. A schematic diagram is presented in Fig. 1Fig. 1


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)

Schematic diagram of the binocular adaptive optics visual simulator showing the main components. The setup includes a single Hartmann-Shack wavefront sensor and a single correcting device for measurement and manipulation of aberrations from the two eyes. The system incorporates two microdisplays for producing retinal disparity, therefore creating stereopsis.
© Copyright Policy - open-access
Related In: Results  -  Collection

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getmorefigures.php?uid=PMC3675862&req=5

g001: Schematic diagram of the binocular adaptive optics visual simulator showing the main components. The setup includes a single Hartmann-Shack wavefront sensor and a single correcting device for measurement and manipulation of aberrations from the two eyes. The system incorporates two microdisplays for producing retinal disparity, therefore creating stereopsis.
Mentions: A binocular adaptive optics visual analyzer [24] was developed to perform the experiment. The apparatus was a modified version of one described elsewhere [28]. The system was able to measure and manipulate ocular aberrations from the two eyes simultaneously, while the subject performed visual testing. A schematic diagram is presented in Fig. 1Fig. 1

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