Effect of Experimentally Induced Astigmatism on Functional, Conventional, and Low-Contrast Visual Acuity
In: Journal of Refractive Surgery, Jg. 29 (2013), S. 19-25
Online
unknown
Zugriff:
PURPOSE: To report the changes in functional visual acuity (FVA) in eyes with experimentally induced astigmatism. METHODS: This study included 26 right eyes from 26 healthy participants (mean age: 27.0±4.4 years). After confirming best correction under cycloplegia, the cylinder power ×90° and ×180° (against-the-rule [ATR] and with-the-rule [WTR] astigmatism, respectively) were added with 0.50-diopter (D) steps, from 0.50 to 2.50 D. Conventional visual acuity (VA), FVA as measured by the FVA Measurement System (NIDEK Co Ltd), and 10% low-contrast visual acuity (LCVA) were measured with 3-mm artificial pupil under each condition. RESULTS: The mean corrected logMAR VA, FVA, LCVA were −0.18±0.00 (20/13), −0.10±0.08 (20/16), and 0.06±0.06 (20/23), respectively. The VA, FVA, and LCVA had a significant linear negative correlation with the addition of cylinder irrespective of the axes. A significant decrease in FVA was noted on addition of ⩾0.50 D WTR astigmatism and ⩾1.00 D ATR astigmatism. With the addition of 1.00 D of cylindrical lens, 96% of eyes with WTR and ATR astigmatism could maintain 20/20 in VA testing, whereas only 50% and 62% of eyes with WTR and ATR astigmatism, respectively, could maintain 20/20 in FVA testing. CONCLUSIONS: Astigmatism may be associated with deterioration of visual function even when conventional VA of 20/20 is attained. Functional VA testing seems to be useful in evaluating the masked astigmatic visual impairment that cannot be detected by conventional VA testing.
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Effect of Experimentally Induced Astigmatism on Functional, Conventional, and Low-Contrast Visual Acuity
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Autor/in / Beteiligte Person: | Watanabe, Kazuhiro ; Torii, Hidemasa ; Kaido, Minako ; Negishi, Kazuno ; Tsubota, Kazuo ; Kawai, M. |
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Zeitschrift: | Journal of Refractive Surgery, Jg. 29 (2013), S. 19-25 |
Veröffentlichung: | SLACK, Inc., 2013 |
Medientyp: | unknown |
ISSN: | 1081-597X (print) |
DOI: | 10.3928/1081597x-20121211-01 |
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