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Measurement of ocular aberrations in downward gaze using a modified clinical aberrometer
Changes in corneal optics have been measured after downward gaze. However, ocular aberrations during downward gaze have not been previously measured. A commercial Shack-Hartmann aberrometer (COAS-HD) was modified by adding a relay lens system and a rotatable beam splitter to allow on-axis aberration...
Autores principales: | , , , , |
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Formato: | Texto |
Lenguaje: | English |
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Optical Society of America
2011
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3047351/ https://www.ncbi.nlm.nih.gov/pubmed/21412451 http://dx.doi.org/10.1364/BOE.2.000452 |
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author | Ghosh, Atanu Collins, Michael J Read, Scott A Davis, Brett A Iskander, D. Robert |
author_facet | Ghosh, Atanu Collins, Michael J Read, Scott A Davis, Brett A Iskander, D. Robert |
author_sort | Ghosh, Atanu |
collection | PubMed |
description | Changes in corneal optics have been measured after downward gaze. However, ocular aberrations during downward gaze have not been previously measured. A commercial Shack-Hartmann aberrometer (COAS-HD) was modified by adding a relay lens system and a rotatable beam splitter to allow on-axis aberration measurements in primary gaze and downward gaze with binocular fixation. Measurements with the modified aberrometer (COAS-HD relay system) in primary and downward gaze were validated against a conventional aberrometer. In human eyes, there were significant changes (p<0.05) in defocus C(2,0), primary astigmatism C(2,2) and vertical coma C(3,−1) in downward gaze (25 degrees) compared to primary gaze, indicating the potential influence of biomechanical forces on the optics of the eye in downward gaze. To demonstrate a further clinical application of this modified aberrometer, we measured ocular aberrations when wearing a progressive addition lens (PAL) in primary gaze (0 degree), 15 degrees downward gaze and 25 degrees downward gaze. |
format | Text |
id | pubmed-3047351 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2011 |
publisher | Optical Society of America |
record_format | MEDLINE/PubMed |
spelling | pubmed-30473512011-03-16 Measurement of ocular aberrations in downward gaze using a modified clinical aberrometer Ghosh, Atanu Collins, Michael J Read, Scott A Davis, Brett A Iskander, D. Robert Biomed Opt Express Vision, Color, and Visual Optics Changes in corneal optics have been measured after downward gaze. However, ocular aberrations during downward gaze have not been previously measured. A commercial Shack-Hartmann aberrometer (COAS-HD) was modified by adding a relay lens system and a rotatable beam splitter to allow on-axis aberration measurements in primary gaze and downward gaze with binocular fixation. Measurements with the modified aberrometer (COAS-HD relay system) in primary and downward gaze were validated against a conventional aberrometer. In human eyes, there were significant changes (p<0.05) in defocus C(2,0), primary astigmatism C(2,2) and vertical coma C(3,−1) in downward gaze (25 degrees) compared to primary gaze, indicating the potential influence of biomechanical forces on the optics of the eye in downward gaze. To demonstrate a further clinical application of this modified aberrometer, we measured ocular aberrations when wearing a progressive addition lens (PAL) in primary gaze (0 degree), 15 degrees downward gaze and 25 degrees downward gaze. Optical Society of America 2011-02-01 /pmc/articles/PMC3047351/ /pubmed/21412451 http://dx.doi.org/10.1364/BOE.2.000452 Text en ©2011 Optical Society of America http://creativecommons.org/licenses/by-nc-nd/3.0/ This is an open-access article distributed under the terms of the Creative Commons Attribution-Noncommercial-No Derivative Works 3.0 Unported License, which permits download and redistribution, provided that the original work is properly cited. This license restricts the article from being modified or used commercially. |
spellingShingle | Vision, Color, and Visual Optics Ghosh, Atanu Collins, Michael J Read, Scott A Davis, Brett A Iskander, D. Robert Measurement of ocular aberrations in downward gaze using a modified clinical aberrometer |
title | Measurement of ocular aberrations in downward gaze using a modified clinical aberrometer |
title_full | Measurement of ocular aberrations in downward gaze using a modified clinical aberrometer |
title_fullStr | Measurement of ocular aberrations in downward gaze using a modified clinical aberrometer |
title_full_unstemmed | Measurement of ocular aberrations in downward gaze using a modified clinical aberrometer |
title_short | Measurement of ocular aberrations in downward gaze using a modified clinical aberrometer |
title_sort | measurement of ocular aberrations in downward gaze using a modified clinical aberrometer |
topic | Vision, Color, and Visual Optics |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3047351/ https://www.ncbi.nlm.nih.gov/pubmed/21412451 http://dx.doi.org/10.1364/BOE.2.000452 |
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