Comparison between optical and digital blur using near visual acuity

Abstract In a low-cost laboratory setup, we compared visual acuity (VA) for stimuli rendered with Zernike aberrations to an equivalent optical dioptric defocus in emmetropic individuals using a relatively short observing distance of 60 cm. The equivalent spherical refractive error of + 1, + 2 or + 4...

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Autores principales:	David Kordek, Laura K. Young, Jan Kremláček
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2021
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/7e415043917245078b5f445fb8ad4fce
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spelling	oai:doaj.org-article:7e415043917245078b5f445fb8ad4fce2021-12-02T13:30:17ZComparison between optical and digital blur using near visual acuity10.1038/s41598-021-82965-z2045-2322https://doaj.org/article/7e415043917245078b5f445fb8ad4fce2021-02-01T00:00:00Zhttps://doi.org/10.1038/s41598-021-82965-zhttps://doaj.org/toc/2045-2322Abstract In a low-cost laboratory setup, we compared visual acuity (VA) for stimuli rendered with Zernike aberrations to an equivalent optical dioptric defocus in emmetropic individuals using a relatively short observing distance of 60 cm. The equivalent spherical refractive error of + 1, + 2 or + 4 D, was applied in the rendering of Landolt Rings. Separately, the refractive error was introduced dioptrically in: (1) unchanged Landolt Rings with an added external lens (+ 1, + 2 or + 4 D) at the subject's eye; (2) same as (1) but with an added accommodation and a vertex distance adjustment. To compare all three approaches, we examined VA in 10 healthy men. Stimuli were observed on a PC CRT screen. For all three levels of refractive error, the pairwise comparison did not show a statistically significant difference between digital blur and accommodation-plus-vertex-distance-adjusted dioptric blur (p < 0.204). The best agreement, determined by Bland–Altman analysis, was measured for + 4 D and was in line with test–retest limits for examination in the clinical population. Our results show that even for a near observing distance, it is possible to use digitally rendered defocus to replicate dioptric blur without a significant change in VA in emmetropic subjects.David KordekLaura K. YoungJan KremláčekNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 11, Iss 1, Pp 1-8 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q David Kordek Laura K. Young Jan Kremláček Comparison between optical and digital blur using near visual acuity
description	Abstract In a low-cost laboratory setup, we compared visual acuity (VA) for stimuli rendered with Zernike aberrations to an equivalent optical dioptric defocus in emmetropic individuals using a relatively short observing distance of 60 cm. The equivalent spherical refractive error of + 1, + 2 or + 4 D, was applied in the rendering of Landolt Rings. Separately, the refractive error was introduced dioptrically in: (1) unchanged Landolt Rings with an added external lens (+ 1, + 2 or + 4 D) at the subject's eye; (2) same as (1) but with an added accommodation and a vertex distance adjustment. To compare all three approaches, we examined VA in 10 healthy men. Stimuli were observed on a PC CRT screen. For all three levels of refractive error, the pairwise comparison did not show a statistically significant difference between digital blur and accommodation-plus-vertex-distance-adjusted dioptric blur (p < 0.204). The best agreement, determined by Bland–Altman analysis, was measured for + 4 D and was in line with test–retest limits for examination in the clinical population. Our results show that even for a near observing distance, it is possible to use digitally rendered defocus to replicate dioptric blur without a significant change in VA in emmetropic subjects.
format	article
author	David Kordek Laura K. Young Jan Kremláček
author_facet	David Kordek Laura K. Young Jan Kremláček
author_sort	David Kordek
title	Comparison between optical and digital blur using near visual acuity
title_short	Comparison between optical and digital blur using near visual acuity
title_full	Comparison between optical and digital blur using near visual acuity
title_fullStr	Comparison between optical and digital blur using near visual acuity
title_full_unstemmed	Comparison between optical and digital blur using near visual acuity
title_sort	comparison between optical and digital blur using near visual acuity
publisher	Nature Portfolio
publishDate	2021
url	https://doaj.org/article/7e415043917245078b5f445fb8ad4fce
work_keys_str_mv	AT davidkordek comparisonbetweenopticalanddigitalblurusingnearvisualacuity AT laurakyoung comparisonbetweenopticalanddigitalblurusingnearvisualacuity AT jankremlacek comparisonbetweenopticalanddigitalblurusingnearvisualacuity
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Comparison between optical and digital blur using near visual acuity

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