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Posterior Corneal Characteristics of Cataract Patients with High Myopia

PURPOSE: To evaluate the characteristics of the posterior corneal surface in patients with high myopia before cataract surgery. METHODS: We performed a cross-sectional study at the Eye and ENT Hospital of Fudan University, Shanghai, China. Corneal astigmatism and axial length were measured with a ro...

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Autores principales: Jing, Qinghe, Tang, Yating, Qian, Dongjin, Lu, Yi, Jiang, Yongxiang
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Public Library of Science 2016
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5014344/
https://www.ncbi.nlm.nih.gov/pubmed/27603713
http://dx.doi.org/10.1371/journal.pone.0162012
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author Jing, Qinghe
Tang, Yating
Qian, Dongjin
Lu, Yi
Jiang, Yongxiang
author_facet Jing, Qinghe
Tang, Yating
Qian, Dongjin
Lu, Yi
Jiang, Yongxiang
author_sort Jing, Qinghe
collection PubMed
description PURPOSE: To evaluate the characteristics of the posterior corneal surface in patients with high myopia before cataract surgery. METHODS: We performed a cross-sectional study at the Eye and ENT Hospital of Fudan University, Shanghai, China. Corneal astigmatism and axial length were measured with a rotating Scheimpflug camera (Pentacam) and partial coherence interferometry (IOLMaster) in a high-myopia study group of 167 eyes (axial length ≥ 26 mm) and a control group of 150 eyes (axial length > 20 mm and < 25 mm). RESULTS: Total corneal astigmatism and anterior corneal astigmatism values were higher in the high-myopia group than in the control group. There was no significant difference in posterior corneal astigmatism between the high-myopia study group and the control group. In the study group, the mean posterior corneal astigmatism (range 0 – −0.9 diopters) was –0.29 diopters (D) ± 0.17 standard deviations (SD). The steep corneal meridian was aligned vertically (60°–120°) in 87.43% of eyes for the posterior corneal surface, and did not change with increasing age. There was a significant correlation (r = 0.235, p = 0.002) between posterior corneal astigmatism and anterior corneal astigmatism, especially when the anterior corneal surface showed with-the-rule (WTR) astigmatism (r = 0.452, p = 0.000). There was a weak negative correlation between posterior corneal astigmatism and age (r = –0.15, p = 0.053) in the high-myopia group. Compared with total corneal astigmatism values, the anterior corneal measurements alone overestimated WTR astigmatism by a mean of 0.27 ± 0.18 D in 68.75% of eyes, underestimated against-the-rule (ATR) astigmatism by a mean of 0.41 ± 0.28 D in 88.89% of eyes, and underestimated oblique astigmatism by a mean of 0.24 ± 0.13 D in 63.64% of eyes. CONCLUSIONS: Posterior corneal astigmatism decreased with age and remained as ATR astigmatism in most cases of high myopia. There was a significant correlation between posterior corneal astigmatism and anterior corneal astigmatism when anterior corneal astigmatism was WTR. If posterior corneal astigmatism is not accounted for when selecting toric intraocular lenses for high-myopia patients, the use of anterior corneal astigmatism measurements alone will lead to overestimation of WTR astigmatism and underestimation of ATR and oblique astigmatism.
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spelling pubmed-50143442016-09-27 Posterior Corneal Characteristics of Cataract Patients with High Myopia Jing, Qinghe Tang, Yating Qian, Dongjin Lu, Yi Jiang, Yongxiang PLoS One Research Article PURPOSE: To evaluate the characteristics of the posterior corneal surface in patients with high myopia before cataract surgery. METHODS: We performed a cross-sectional study at the Eye and ENT Hospital of Fudan University, Shanghai, China. Corneal astigmatism and axial length were measured with a rotating Scheimpflug camera (Pentacam) and partial coherence interferometry (IOLMaster) in a high-myopia study group of 167 eyes (axial length ≥ 26 mm) and a control group of 150 eyes (axial length > 20 mm and < 25 mm). RESULTS: Total corneal astigmatism and anterior corneal astigmatism values were higher in the high-myopia group than in the control group. There was no significant difference in posterior corneal astigmatism between the high-myopia study group and the control group. In the study group, the mean posterior corneal astigmatism (range 0 – −0.9 diopters) was –0.29 diopters (D) ± 0.17 standard deviations (SD). The steep corneal meridian was aligned vertically (60°–120°) in 87.43% of eyes for the posterior corneal surface, and did not change with increasing age. There was a significant correlation (r = 0.235, p = 0.002) between posterior corneal astigmatism and anterior corneal astigmatism, especially when the anterior corneal surface showed with-the-rule (WTR) astigmatism (r = 0.452, p = 0.000). There was a weak negative correlation between posterior corneal astigmatism and age (r = –0.15, p = 0.053) in the high-myopia group. Compared with total corneal astigmatism values, the anterior corneal measurements alone overestimated WTR astigmatism by a mean of 0.27 ± 0.18 D in 68.75% of eyes, underestimated against-the-rule (ATR) astigmatism by a mean of 0.41 ± 0.28 D in 88.89% of eyes, and underestimated oblique astigmatism by a mean of 0.24 ± 0.13 D in 63.64% of eyes. CONCLUSIONS: Posterior corneal astigmatism decreased with age and remained as ATR astigmatism in most cases of high myopia. There was a significant correlation between posterior corneal astigmatism and anterior corneal astigmatism when anterior corneal astigmatism was WTR. If posterior corneal astigmatism is not accounted for when selecting toric intraocular lenses for high-myopia patients, the use of anterior corneal astigmatism measurements alone will lead to overestimation of WTR astigmatism and underestimation of ATR and oblique astigmatism. Public Library of Science 2016-09-07 /pmc/articles/PMC5014344/ /pubmed/27603713 http://dx.doi.org/10.1371/journal.pone.0162012 Text en © 2016 Jing et al http://creativecommons.org/licenses/by/4.0/ This is an open access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0/) , which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.
spellingShingle Research Article
Jing, Qinghe
Tang, Yating
Qian, Dongjin
Lu, Yi
Jiang, Yongxiang
Posterior Corneal Characteristics of Cataract Patients with High Myopia
title Posterior Corneal Characteristics of Cataract Patients with High Myopia
title_full Posterior Corneal Characteristics of Cataract Patients with High Myopia
title_fullStr Posterior Corneal Characteristics of Cataract Patients with High Myopia
title_full_unstemmed Posterior Corneal Characteristics of Cataract Patients with High Myopia
title_short Posterior Corneal Characteristics of Cataract Patients with High Myopia
title_sort posterior corneal characteristics of cataract patients with high myopia
topic Research Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5014344/
https://www.ncbi.nlm.nih.gov/pubmed/27603713
http://dx.doi.org/10.1371/journal.pone.0162012
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