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Visual performance in cataract patients with low levels of postoperative astigmatism: full correction versus spherical equivalent correction

PURPOSE: To evaluate whether visual performance could be improved in pseudophakic subjects by correcting low levels of postoperative astigmatism. METHODS: An exploratory, noninterventional study was conducted using subjects who had been implanted with an aspheric intraocular lens and had 0.5–0.75 di...

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Autores principales: Lehmann, Robert P, Houtman, Diane M
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Dove Medical Press 2012
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3295631/
https://www.ncbi.nlm.nih.gov/pubmed/22399846
http://dx.doi.org/10.2147/OPTH.S28241
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author Lehmann, Robert P
Houtman, Diane M
author_facet Lehmann, Robert P
Houtman, Diane M
author_sort Lehmann, Robert P
collection PubMed
description PURPOSE: To evaluate whether visual performance could be improved in pseudophakic subjects by correcting low levels of postoperative astigmatism. METHODS: An exploratory, noninterventional study was conducted using subjects who had been implanted with an aspheric intraocular lens and had 0.5–0.75 diopter postoperative astigmatism. Monocular visual performance using full correction was compared with visual performance using spherical equivalent correction. Testing consisted of high- and low-contrast visual acuity, contrast sensitivity, and reading acuity and speed using the Radner Reading Charts. RESULTS: Thirty-eight of 40 subjects completed testing. Visual acuities at three contrast levels (100%, 25%, and 9%) were significantly better using full correction than when using spherical equivalent correction (all P < 0.001). For contrast sensitivity testing under photopic, mesopic, and mesopic with glare conditions, only one out of twelve outcomes demonstrated a significant improvement with full correction compared with spherical equivalent correction (at six cycles per degree under mesopic without glare conditions, P = 0.046). Mean reading speed was numerically faster with full correction across all print sizes, reaching statistical significance at logarithm of the reading acuity determination (logRAD) 0.2, 0.7, and 1.1 (P < 0.05). Statistically significant differences also favored full correction in logRAD score (P = 0.0376), corrected maximum reading speed (P < 0.001), and logarithm of the minimum angle of resolution/logRAD ratio (P < 0.001). CONCLUSIONS: In this study of pseudophakic subjects with low levels of postoperative astigmatism, full correction yielded significantly better reading performance and high- and low-contrast visual acuity than spherical equivalent correction, suggesting that cataractous patients may benefit from surgical correction of low levels of preoperative corneal astigmatism.
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spelling pubmed-32956312012-03-07 Visual performance in cataract patients with low levels of postoperative astigmatism: full correction versus spherical equivalent correction Lehmann, Robert P Houtman, Diane M Clin Ophthalmol Original Research PURPOSE: To evaluate whether visual performance could be improved in pseudophakic subjects by correcting low levels of postoperative astigmatism. METHODS: An exploratory, noninterventional study was conducted using subjects who had been implanted with an aspheric intraocular lens and had 0.5–0.75 diopter postoperative astigmatism. Monocular visual performance using full correction was compared with visual performance using spherical equivalent correction. Testing consisted of high- and low-contrast visual acuity, contrast sensitivity, and reading acuity and speed using the Radner Reading Charts. RESULTS: Thirty-eight of 40 subjects completed testing. Visual acuities at three contrast levels (100%, 25%, and 9%) were significantly better using full correction than when using spherical equivalent correction (all P < 0.001). For contrast sensitivity testing under photopic, mesopic, and mesopic with glare conditions, only one out of twelve outcomes demonstrated a significant improvement with full correction compared with spherical equivalent correction (at six cycles per degree under mesopic without glare conditions, P = 0.046). Mean reading speed was numerically faster with full correction across all print sizes, reaching statistical significance at logarithm of the reading acuity determination (logRAD) 0.2, 0.7, and 1.1 (P < 0.05). Statistically significant differences also favored full correction in logRAD score (P = 0.0376), corrected maximum reading speed (P < 0.001), and logarithm of the minimum angle of resolution/logRAD ratio (P < 0.001). CONCLUSIONS: In this study of pseudophakic subjects with low levels of postoperative astigmatism, full correction yielded significantly better reading performance and high- and low-contrast visual acuity than spherical equivalent correction, suggesting that cataractous patients may benefit from surgical correction of low levels of preoperative corneal astigmatism. Dove Medical Press 2012 2012-03-02 /pmc/articles/PMC3295631/ /pubmed/22399846 http://dx.doi.org/10.2147/OPTH.S28241 Text en © 2012 Lehmann and Houtman, publisher and licensee Dove Medical Press Ltd. This is an Open Access article which permits unrestricted noncommercial use, provided the original work is properly cited.
spellingShingle Original Research
Lehmann, Robert P
Houtman, Diane M
Visual performance in cataract patients with low levels of postoperative astigmatism: full correction versus spherical equivalent correction
title Visual performance in cataract patients with low levels of postoperative astigmatism: full correction versus spherical equivalent correction
title_full Visual performance in cataract patients with low levels of postoperative astigmatism: full correction versus spherical equivalent correction
title_fullStr Visual performance in cataract patients with low levels of postoperative astigmatism: full correction versus spherical equivalent correction
title_full_unstemmed Visual performance in cataract patients with low levels of postoperative astigmatism: full correction versus spherical equivalent correction
title_short Visual performance in cataract patients with low levels of postoperative astigmatism: full correction versus spherical equivalent correction
title_sort visual performance in cataract patients with low levels of postoperative astigmatism: full correction versus spherical equivalent correction
topic Original Research
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3295631/
https://www.ncbi.nlm.nih.gov/pubmed/22399846
http://dx.doi.org/10.2147/OPTH.S28241
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