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Mesopic Functional Visual Acuity in Normal Subjects

To evaluate mesopic functional visual acuity (FVA) with a newly developed system in normal subjects and to compare the results with photopic FVA, sixty-eight healthy volunteers (24.03 ± 4.42 [mean ± standard deviation] years) were enrolled in this study. A commercially available FVA measurement syst...

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Autores principales: Hiraoka, Takahiro, Hoshi, Sujin, Okamoto, Yoshifumi, Okamoto, Fumiki, Oshika, Tetsuro
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Public Library of Science 2015
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4517889/
https://www.ncbi.nlm.nih.gov/pubmed/26218066
http://dx.doi.org/10.1371/journal.pone.0134505
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author Hiraoka, Takahiro
Hoshi, Sujin
Okamoto, Yoshifumi
Okamoto, Fumiki
Oshika, Tetsuro
author_facet Hiraoka, Takahiro
Hoshi, Sujin
Okamoto, Yoshifumi
Okamoto, Fumiki
Oshika, Tetsuro
author_sort Hiraoka, Takahiro
collection PubMed
description To evaluate mesopic functional visual acuity (FVA) with a newly developed system in normal subjects and to compare the results with photopic FVA, sixty-eight healthy volunteers (24.03 ± 4.42 [mean ± standard deviation] years) were enrolled in this study. A commercially available FVA measurement system (AS-28; Kowa, Aichi, Japan) was modified to measure FVA under mesopic conditions as well as photopic conditions. Measurements were performed monocularly in photopic conditions during 60 seconds. After dark adaptation for 15 minutes, the same measurements were repeated in mesopic conditions. Outcomes included starting visual acuity (VA), FVA (the average of VAs), visual maintenance ratio (VMR), maximum VA, minimum VA, and numbers of blinks during the 60-second measurement session, and were compared between mesopic and photopic conditions. Starting VA was –0.11 ± 0.08 and 0.39 ± 0.12 logarithm of the minimum angle of resolution (logMAR) in photopic and mesopic conditions, respectively. FVA was –0.06 ± 0.09 and 0.52 ± 0.14 logMAR, VMR was 0.98 ± 0.02 and 0.94 ± 0.04, maximum VA was –0.15 ± 0.06 and 0.33 ± 0.12 logMAR, the minimum VA was 0.05 ± 0.12 and 0.78 ± 0.20 logMAR, and the number of blinks was 8.23 ± 7.54 and 7.23 ± 6.20, respectively. All these parameters except the number of blinks were significantly different between the two conditions (P < 0.001). Besides, the difference between maximum and minimum VAs and standard deviation of VA were significantly larger in mesopic than in photopic conditions (P < 0.001). This study revealed that not only overall visual function decline but also instability of vision under mesopic conditions even in healthy subjects.
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spelling pubmed-45178892015-07-31 Mesopic Functional Visual Acuity in Normal Subjects Hiraoka, Takahiro Hoshi, Sujin Okamoto, Yoshifumi Okamoto, Fumiki Oshika, Tetsuro PLoS One Research Article To evaluate mesopic functional visual acuity (FVA) with a newly developed system in normal subjects and to compare the results with photopic FVA, sixty-eight healthy volunteers (24.03 ± 4.42 [mean ± standard deviation] years) were enrolled in this study. A commercially available FVA measurement system (AS-28; Kowa, Aichi, Japan) was modified to measure FVA under mesopic conditions as well as photopic conditions. Measurements were performed monocularly in photopic conditions during 60 seconds. After dark adaptation for 15 minutes, the same measurements were repeated in mesopic conditions. Outcomes included starting visual acuity (VA), FVA (the average of VAs), visual maintenance ratio (VMR), maximum VA, minimum VA, and numbers of blinks during the 60-second measurement session, and were compared between mesopic and photopic conditions. Starting VA was –0.11 ± 0.08 and 0.39 ± 0.12 logarithm of the minimum angle of resolution (logMAR) in photopic and mesopic conditions, respectively. FVA was –0.06 ± 0.09 and 0.52 ± 0.14 logMAR, VMR was 0.98 ± 0.02 and 0.94 ± 0.04, maximum VA was –0.15 ± 0.06 and 0.33 ± 0.12 logMAR, the minimum VA was 0.05 ± 0.12 and 0.78 ± 0.20 logMAR, and the number of blinks was 8.23 ± 7.54 and 7.23 ± 6.20, respectively. All these parameters except the number of blinks were significantly different between the two conditions (P < 0.001). Besides, the difference between maximum and minimum VAs and standard deviation of VA were significantly larger in mesopic than in photopic conditions (P < 0.001). This study revealed that not only overall visual function decline but also instability of vision under mesopic conditions even in healthy subjects. Public Library of Science 2015-07-28 /pmc/articles/PMC4517889/ /pubmed/26218066 http://dx.doi.org/10.1371/journal.pone.0134505 Text en © 2015 Hiraoka et al http://creativecommons.org/licenses/by/4.0/ This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are properly credited.
spellingShingle Research Article
Hiraoka, Takahiro
Hoshi, Sujin
Okamoto, Yoshifumi
Okamoto, Fumiki
Oshika, Tetsuro
Mesopic Functional Visual Acuity in Normal Subjects
title Mesopic Functional Visual Acuity in Normal Subjects
title_full Mesopic Functional Visual Acuity in Normal Subjects
title_fullStr Mesopic Functional Visual Acuity in Normal Subjects
title_full_unstemmed Mesopic Functional Visual Acuity in Normal Subjects
title_short Mesopic Functional Visual Acuity in Normal Subjects
title_sort mesopic functional visual acuity in normal subjects
topic Research Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4517889/
https://www.ncbi.nlm.nih.gov/pubmed/26218066
http://dx.doi.org/10.1371/journal.pone.0134505
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