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Measuring Ocular Aberrations Sequentially Using a Digital Micromirror Device

The Hartmann–Shack wavefront sensor is widely used to measure aberrations in both astronomy and ophthalmology. Yet, the dynamic range of the sensor is limited by cross-talk between adjacent lenslets. In this study, we explore ocular aberration measurements with a recently-proposed variant of the sen...

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Autores principales: Carmichael Martins, Alessandra, Vohnsen, Brian
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2019
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6412697/
https://www.ncbi.nlm.nih.gov/pubmed/30759743
http://dx.doi.org/10.3390/mi10020117
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author Carmichael Martins, Alessandra
Vohnsen, Brian
author_facet Carmichael Martins, Alessandra
Vohnsen, Brian
author_sort Carmichael Martins, Alessandra
collection PubMed
description The Hartmann–Shack wavefront sensor is widely used to measure aberrations in both astronomy and ophthalmology. Yet, the dynamic range of the sensor is limited by cross-talk between adjacent lenslets. In this study, we explore ocular aberration measurements with a recently-proposed variant of the sensor that makes use of a digital micromirror device for sequential aperture scanning of the pupil, thereby avoiding the use of a lenslet array. We report on results with the sensor using two different detectors, a lateral position sensor and a charge-coupled device (CCD) scientific camera, and explore the pros and cons of both. Wavefront measurements of a highly aberrated artificial eye and of five real eyes, including a highly myopic subject, are demonstrated, and the role of pupil sampling density, CCD pixel binning, and scanning speed are explored. We find that the lateral position sensor is mostly suited for high-power applications, whereas the CCD camera with pixel binning performs consistently well both with the artificial eye and for real-eye measurements, and can outperform a commonly-used wavefront sensor with highly aberrated wavefronts.
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spelling pubmed-64126972019-04-09 Measuring Ocular Aberrations Sequentially Using a Digital Micromirror Device Carmichael Martins, Alessandra Vohnsen, Brian Micromachines (Basel) Article The Hartmann–Shack wavefront sensor is widely used to measure aberrations in both astronomy and ophthalmology. Yet, the dynamic range of the sensor is limited by cross-talk between adjacent lenslets. In this study, we explore ocular aberration measurements with a recently-proposed variant of the sensor that makes use of a digital micromirror device for sequential aperture scanning of the pupil, thereby avoiding the use of a lenslet array. We report on results with the sensor using two different detectors, a lateral position sensor and a charge-coupled device (CCD) scientific camera, and explore the pros and cons of both. Wavefront measurements of a highly aberrated artificial eye and of five real eyes, including a highly myopic subject, are demonstrated, and the role of pupil sampling density, CCD pixel binning, and scanning speed are explored. We find that the lateral position sensor is mostly suited for high-power applications, whereas the CCD camera with pixel binning performs consistently well both with the artificial eye and for real-eye measurements, and can outperform a commonly-used wavefront sensor with highly aberrated wavefronts. MDPI 2019-02-12 /pmc/articles/PMC6412697/ /pubmed/30759743 http://dx.doi.org/10.3390/mi10020117 Text en © 2019 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Carmichael Martins, Alessandra
Vohnsen, Brian
Measuring Ocular Aberrations Sequentially Using a Digital Micromirror Device
title Measuring Ocular Aberrations Sequentially Using a Digital Micromirror Device
title_full Measuring Ocular Aberrations Sequentially Using a Digital Micromirror Device
title_fullStr Measuring Ocular Aberrations Sequentially Using a Digital Micromirror Device
title_full_unstemmed Measuring Ocular Aberrations Sequentially Using a Digital Micromirror Device
title_short Measuring Ocular Aberrations Sequentially Using a Digital Micromirror Device
title_sort measuring ocular aberrations sequentially using a digital micromirror device
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6412697/
https://www.ncbi.nlm.nih.gov/pubmed/30759743
http://dx.doi.org/10.3390/mi10020117
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