Astigmatism and optical coherence tomography measurements

Young Hoon Hwang, Sang Mok Lee, Yong Yeon Kim, Jong Yeon Lee, Chungkwon Yoo

Research output: Contribution to journalArticle

14 Citations (Scopus)

Abstract

Background To evaluate the effect of astigmatism change on measurement of retinal nerve fiber layer (RNFL) and macular thickness by Cirrus HD spectral-domain optical coherence tomography (Cirrus HD OCT; Carl Zeiss Meditec, Dublin, CA, USA). Methods A total of 30 right eyes from 30 healthy young subjects underwent RNFL and macular thickness measurements using Cirrus HD OCT. Measurements were performed at the baseline state and induced with-therule (WTR) and against-the-rule (ATR) astigmatism states by wearing toric soft contact lenses (+1.50 .3.25 diopter × 90° and +1.50 .3.25 diopter × 180° respectively). Dfferences in RNFL and macular thickness between the baseline state and induced astigmatism states were analyzed. Results Wearing toric soft contact lenses induced a mean 2.92 diopter WTR and 3.18 diopter ATR astigmatism respectively. After signal strength change adjustment, RNFL thicknesses of average, superior quadrant, 12 and 6 o'clock hour sectors decreased after induction of a WTR astigmatism (mean difference range, 1.58 to 6.88 μm); RNFL thicknesses of average, nasal, temporal quadrants, 2, 3, and 9 o'clock hour sectors decreased after induction of an ATR astigmatism (mean difference range, 0.75 to 5.11 μm) (all P values<0.05). Macular thickness was not significantly affected by astigmatism changes (all P values≥0.250). Conclusion Although the amount of change was not substantial, RNFL thickness measured by Cirrus HD OCT was affected by astigmatism changes induced by contact lenses. It may be warranted to consider the effect of astigmatism on RNFL thickness measured by OCT in eyes with higher degrees of astigmatism.

Original languageEnglish
Pages (from-to)247-254
Number of pages8
JournalGraefe's Archive for Clinical and Experimental Ophthalmology
Volume250
Issue number2
DOIs
Publication statusPublished - 2012 Feb 1

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Astigmatism
Optical Coherence Tomography
Nerve Fibers
Hydrophilic Contact Lens
Contact Lenses
Nose
Healthy Volunteers

Keywords

  • Astigmatism
  • Glaucoma
  • Optical coherence tomography
  • Retinal nerve fiber layer

ASJC Scopus subject areas

  • Ophthalmology
  • Sensory Systems
  • Cellular and Molecular Neuroscience

Cite this

Astigmatism and optical coherence tomography measurements. / Hwang, Young Hoon; Lee, Sang Mok; Kim, Yong Yeon; Lee, Jong Yeon; Yoo, Chungkwon.

In: Graefe's Archive for Clinical and Experimental Ophthalmology, Vol. 250, No. 2, 01.02.2012, p. 247-254.

Research output: Contribution to journalArticle

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abstract = "Background To evaluate the effect of astigmatism change on measurement of retinal nerve fiber layer (RNFL) and macular thickness by Cirrus HD spectral-domain optical coherence tomography (Cirrus HD OCT; Carl Zeiss Meditec, Dublin, CA, USA). Methods A total of 30 right eyes from 30 healthy young subjects underwent RNFL and macular thickness measurements using Cirrus HD OCT. Measurements were performed at the baseline state and induced with-therule (WTR) and against-the-rule (ATR) astigmatism states by wearing toric soft contact lenses (+1.50 .3.25 diopter × 90° and +1.50 .3.25 diopter × 180° respectively). Dfferences in RNFL and macular thickness between the baseline state and induced astigmatism states were analyzed. Results Wearing toric soft contact lenses induced a mean 2.92 diopter WTR and 3.18 diopter ATR astigmatism respectively. After signal strength change adjustment, RNFL thicknesses of average, superior quadrant, 12 and 6 o'clock hour sectors decreased after induction of a WTR astigmatism (mean difference range, 1.58 to 6.88 μm); RNFL thicknesses of average, nasal, temporal quadrants, 2, 3, and 9 o'clock hour sectors decreased after induction of an ATR astigmatism (mean difference range, 0.75 to 5.11 μm) (all P values<0.05). Macular thickness was not significantly affected by astigmatism changes (all P values≥0.250). Conclusion Although the amount of change was not substantial, RNFL thickness measured by Cirrus HD OCT was affected by astigmatism changes induced by contact lenses. It may be warranted to consider the effect of astigmatism on RNFL thickness measured by OCT in eyes with higher degrees of astigmatism.",
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AB - Background To evaluate the effect of astigmatism change on measurement of retinal nerve fiber layer (RNFL) and macular thickness by Cirrus HD spectral-domain optical coherence tomography (Cirrus HD OCT; Carl Zeiss Meditec, Dublin, CA, USA). Methods A total of 30 right eyes from 30 healthy young subjects underwent RNFL and macular thickness measurements using Cirrus HD OCT. Measurements were performed at the baseline state and induced with-therule (WTR) and against-the-rule (ATR) astigmatism states by wearing toric soft contact lenses (+1.50 .3.25 diopter × 90° and +1.50 .3.25 diopter × 180° respectively). Dfferences in RNFL and macular thickness between the baseline state and induced astigmatism states were analyzed. Results Wearing toric soft contact lenses induced a mean 2.92 diopter WTR and 3.18 diopter ATR astigmatism respectively. After signal strength change adjustment, RNFL thicknesses of average, superior quadrant, 12 and 6 o'clock hour sectors decreased after induction of a WTR astigmatism (mean difference range, 1.58 to 6.88 μm); RNFL thicknesses of average, nasal, temporal quadrants, 2, 3, and 9 o'clock hour sectors decreased after induction of an ATR astigmatism (mean difference range, 0.75 to 5.11 μm) (all P values<0.05). Macular thickness was not significantly affected by astigmatism changes (all P values≥0.250). Conclusion Although the amount of change was not substantial, RNFL thickness measured by Cirrus HD OCT was affected by astigmatism changes induced by contact lenses. It may be warranted to consider the effect of astigmatism on RNFL thickness measured by OCT in eyes with higher degrees of astigmatism.

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