Effect of experimentally induced astigmatism on functional, conventional, and low-contrast visual acuity

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Abstract

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 confi rming 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 artifi cial 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 signifi cant 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.

Original languageEnglish
Pages (from-to)19-24
Number of pages6
JournalJournal of Refractive Surgery
Volume29
Issue number1
DOIs
Publication statusPublished - 2013 Jan

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Astigmatism
Visual Acuity
Crystalline Lens
Vision Disorders
Pupil

ASJC Scopus subject areas

  • Ophthalmology
  • Surgery

Cite this

@article{6c3f975b769b4f27a9845c79d7d63a53,
title = "Effect of experimentally induced astigmatism on functional, conventional, and low-contrast visual acuity",
abstract = "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 confi rming 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 artifi cial 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 signifi cant 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.",
author = "Kazuhiro Watanabe and Kazuno Negishi and Miho Kawai and Hidemasa Torii and Minako Kaido and Kazuo Tsubota",
year = "2013",
month = "1",
doi = "10.3928/1081597X-20121211-01",
language = "English",
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TY - JOUR

T1 - Effect of experimentally induced astigmatism on functional, conventional, and low-contrast visual acuity

AU - Watanabe, Kazuhiro

AU - Negishi, Kazuno

AU - Kawai, Miho

AU - Torii, Hidemasa

AU - Kaido, Minako

AU - Tsubota, Kazuo

PY - 2013/1

Y1 - 2013/1

N2 - 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 confi rming 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 artifi cial 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 signifi cant 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.

AB - 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 confi rming 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 artifi cial 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 signifi cant 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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U2 - 10.3928/1081597X-20121211-01

DO - 10.3928/1081597X-20121211-01

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AN - SCOPUS:84873558117

VL - 29

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JO - Journal of Refractive Surgery

JF - Journal of Refractive Surgery

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