Effects of astigmatic defocus on binocular contrast sensitivity.
PURPOSE:To determine the effects of astigmatism on contrast sensitivity (CS). METHODS:Eighteen normal volunteers (30.5 ± 6.0 [mean ± SD] years) were recruited. After correcting each refractive error by spectacles, against-the-rule (ATR) or with-the-rule (WTR) astigmatism of +1.00, +2.00 and +3.00 D...
| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
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Public Library of Science (PLoS)
2018-01-01
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| Series: | PLoS ONE |
| Online Access: | http://europepmc.org/articles/PMC6091947?pdf=render |
| _version_ | 1818576869935546368 |
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| author | Yumi Hasegawa Takahiro Hiraoka Shinichiro Nakano Fumiki Okamoto Tetsuro Oshika |
| author_facet | Yumi Hasegawa Takahiro Hiraoka Shinichiro Nakano Fumiki Okamoto Tetsuro Oshika |
| author_sort | Yumi Hasegawa |
| collection | DOAJ |
| description | PURPOSE:To determine the effects of astigmatism on contrast sensitivity (CS). METHODS:Eighteen normal volunteers (30.5 ± 6.0 [mean ± SD] years) were recruited. After correcting each refractive error by spectacles, against-the-rule (ATR) or with-the-rule (WTR) astigmatism of +1.00, +2.00 and +3.00 D was intentionally produced in both eyes, and then binocular CS was measured. The cylindrical addition of different powers (+1.00-+3.00 D) was compensated with spherical lenses so that the spherical equivalent refraction became zero in each eye. Subsequently, the above cylindrical addition was monocularly induced, and binocular CS was measured again. The relation between CS and astigmatic power, axis, and monocular or binocular astigmatism was investigated. RESULTS:With binocular ATR and WTR astigmatism, increases in astigmatic power significantly correlated with decreases in the area under the log contrast sensitivity function (AULCSF). With monocular astigmatic defocus, astigmatic power addition did not affect AULCSF. With binocular astigmatic defocus of high-power (+2.00 and +3.00 D), ATR astigmatism deteriorated AULCSF more than WTR astigmatism. In a comparison between binocular and monocular astigmatic defocus, CS was significantly worse with binocular astigmatic defocus than with monocular astigmatic defocus at higher spatial frequencies regardless of astigmatic power. CONCLUSIONS:Binocular astigmatic defocus deteriorates CS depending on the amount of astigmatic power. ATR astigmatism reduces CS more than WTR astigmatism dose. In addition, binocular astigmatic defocus affects CS more severely than monocular astigmatic defocus especially at high spatial frequencies. |
| first_indexed | 2024-12-16T06:20:53Z |
| format | Article |
| id | doaj.art-56fa751a410a4b9385969583633373f8 |
| institution | Directory Open Access Journal |
| issn | 1932-6203 |
| language | English |
| last_indexed | 2024-12-16T06:20:53Z |
| publishDate | 2018-01-01 |
| publisher | Public Library of Science (PLoS) |
| record_format | Article |
| series | PLoS ONE |
| spelling | doaj.art-56fa751a410a4b9385969583633373f82022-12-21T22:41:07ZengPublic Library of Science (PLoS)PLoS ONE1932-62032018-01-01138e020234010.1371/journal.pone.0202340Effects of astigmatic defocus on binocular contrast sensitivity.Yumi HasegawaTakahiro HiraokaShinichiro NakanoFumiki OkamotoTetsuro OshikaPURPOSE:To determine the effects of astigmatism on contrast sensitivity (CS). METHODS:Eighteen normal volunteers (30.5 ± 6.0 [mean ± SD] years) were recruited. After correcting each refractive error by spectacles, against-the-rule (ATR) or with-the-rule (WTR) astigmatism of +1.00, +2.00 and +3.00 D was intentionally produced in both eyes, and then binocular CS was measured. The cylindrical addition of different powers (+1.00-+3.00 D) was compensated with spherical lenses so that the spherical equivalent refraction became zero in each eye. Subsequently, the above cylindrical addition was monocularly induced, and binocular CS was measured again. The relation between CS and astigmatic power, axis, and monocular or binocular astigmatism was investigated. RESULTS:With binocular ATR and WTR astigmatism, increases in astigmatic power significantly correlated with decreases in the area under the log contrast sensitivity function (AULCSF). With monocular astigmatic defocus, astigmatic power addition did not affect AULCSF. With binocular astigmatic defocus of high-power (+2.00 and +3.00 D), ATR astigmatism deteriorated AULCSF more than WTR astigmatism. In a comparison between binocular and monocular astigmatic defocus, CS was significantly worse with binocular astigmatic defocus than with monocular astigmatic defocus at higher spatial frequencies regardless of astigmatic power. CONCLUSIONS:Binocular astigmatic defocus deteriorates CS depending on the amount of astigmatic power. ATR astigmatism reduces CS more than WTR astigmatism dose. In addition, binocular astigmatic defocus affects CS more severely than monocular astigmatic defocus especially at high spatial frequencies.http://europepmc.org/articles/PMC6091947?pdf=render |
| spellingShingle | Yumi Hasegawa Takahiro Hiraoka Shinichiro Nakano Fumiki Okamoto Tetsuro Oshika Effects of astigmatic defocus on binocular contrast sensitivity. PLoS ONE |
| title | Effects of astigmatic defocus on binocular contrast sensitivity. |
| title_full | Effects of astigmatic defocus on binocular contrast sensitivity. |
| title_fullStr | Effects of astigmatic defocus on binocular contrast sensitivity. |
| title_full_unstemmed | Effects of astigmatic defocus on binocular contrast sensitivity. |
| title_short | Effects of astigmatic defocus on binocular contrast sensitivity. |
| title_sort | effects of astigmatic defocus on binocular contrast sensitivity |
| url | http://europepmc.org/articles/PMC6091947?pdf=render |
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