Distribution and related factors of corneal regularity and posterior corneal astigmatism in cataract patients

Chen Li, Jiaju Zhang, Xue Yin, Jianqing Li, Yihong Cao, Peirong LuDepartment of Ophthalmology, The First Affiliated Hospital of Soochow University, Suzhou, People’s Republic of ChinaPurpose: To study the distribution of posterior corneal astigmatism (PCA) and its influencing factors in Chi...

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Autores principales:	Li C, Zhang J, Yin X, Li J, Cao Y, Lu P
Formato:	article
Lenguaje:	EN
Publicado:	Dove Medical Press 2019
Materias:	astigmatism posterior corneal astigmatism aberrations Q value Sirius Scheimpflug photography Ophthalmology RE1-994
Acceso en línea:	https://doaj.org/article/9e59e9c21cd64eadaa998da1216caa17
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spelling	oai:doaj.org-article:9e59e9c21cd64eadaa998da1216caa172021-12-02T08:38:15ZDistribution and related factors of corneal regularity and posterior corneal astigmatism in cataract patients1177-5483https://doaj.org/article/9e59e9c21cd64eadaa998da1216caa172019-07-01T00:00:00Zhttps://www.dovepress.com/distribution-and-related-factors-of-corneal-regularity-and-posterior-c-peer-reviewed-article-OPTHhttps://doaj.org/toc/1177-5483Chen Li, Jiaju Zhang, Xue Yin, Jianqing Li, Yihong Cao, Peirong LuDepartment of Ophthalmology, The First Affiliated Hospital of Soochow University, Suzhou, People’s Republic of ChinaPurpose: To study the distribution of posterior corneal astigmatism (PCA) and its influencing factors in Chinese patients before cataract surgery.Patients and methods: A retrospective study was conducted in the First Affiliated Hospital of Soochow University, Suzhou, China. In all, this study enrolled 121 eligible eyes of 121 cataract patients. The astigmatism, aberrations and Q value of anterior, posterior and total cornea and anterior segment parameters (ACD, CCT, WTW, ATA) were measured by the Sirius System, and AL was measured by Lenstar LS 900. Cataract was diagnosed using slit-lamp examination.Results: The mean age of patients was 67.44±10.66 years old. Mean PCA was 0.31±0.17 (range 0.05–1.09) D and 85.9% eyes had PCA values <0.5 D. With-the-rule (WTR) astigmatism predominated the anterior cornea astigmatism (ACA) (48.8%) and total corneal astigmatism (TCA) (61.2%), while against-the-rule (ATR) astigmatism predominated posterior (86.0%). Significant positive correlation was found between the astigmatic power vector (APV) of ACA and PCA (Pearson correlation=0.318, P<0.001); TCA and PCA (Pearson correlation=0.204, P=0.025); keratometric astigmatism and PCA (Pearson correlation=0.356, P<0.001); this study also found a positive correlation between primary spherical aberration (Z4°) of the total cornea and PCA (Pearson correlation=0.266, P=0.003); primary spherical aberration (Z4°) of the corneal front surface and PCA (Pearson correlation=0.260, P=0.004); total corneal aberrations (Total cornea root mean square [RMS]) and PCA (Pearson correlation=0.327, P<0.001); total corneal higher-orderaberrations (Total HOA RMS) (Pearson correlation=0.232, P=0.011); total corneal lower-order aberrations (Total LOA RMS) (Pearson correlation=0.250, P=0.006). A positive linear correlation between Q value of corneal front surface and PCA, either 6 mm pupil diameter (Pearson correlation=0.264, P=0.003) or 8 mm pupil diameter (Pearson correlation=0.184, P=0.043) was found in this study.Conclusion: Corneal aberration, Q value (front surface specifically) was essential that we need to take into consideration when we conduct PCA and intraocularlens measurement in clinics.Keywords: astigmatism, posterior corneal astigmatism, aberrations, Q value, Sirius, Scheimpflug photographyLi CZhang JYin XLi JCao YLu PDove Medical Pressarticleastigmatismposterior corneal astigmatismaberrationsQ valueSiriusScheimpflug photographyOphthalmologyRE1-994ENClinical Ophthalmology, Vol Volume 13, Pp 1341-1352 (2019)
institution	DOAJ
collection	DOAJ
language	EN
topic	astigmatism posterior corneal astigmatism aberrations Q value Sirius Scheimpflug photography Ophthalmology RE1-994
spellingShingle	astigmatism posterior corneal astigmatism aberrations Q value Sirius Scheimpflug photography Ophthalmology RE1-994 Li C Zhang J Yin X Li J Cao Y Lu P Distribution and related factors of corneal regularity and posterior corneal astigmatism in cataract patients
description	Chen Li, Jiaju Zhang, Xue Yin, Jianqing Li, Yihong Cao, Peirong LuDepartment of Ophthalmology, The First Affiliated Hospital of Soochow University, Suzhou, People’s Republic of ChinaPurpose: To study the distribution of posterior corneal astigmatism (PCA) and its influencing factors in Chinese patients before cataract surgery.Patients and methods: A retrospective study was conducted in the First Affiliated Hospital of Soochow University, Suzhou, China. In all, this study enrolled 121 eligible eyes of 121 cataract patients. The astigmatism, aberrations and Q value of anterior, posterior and total cornea and anterior segment parameters (ACD, CCT, WTW, ATA) were measured by the Sirius System, and AL was measured by Lenstar LS 900. Cataract was diagnosed using slit-lamp examination.Results: The mean age of patients was 67.44±10.66 years old. Mean PCA was 0.31±0.17 (range 0.05–1.09) D and 85.9% eyes had PCA values <0.5 D. With-the-rule (WTR) astigmatism predominated the anterior cornea astigmatism (ACA) (48.8%) and total corneal astigmatism (TCA) (61.2%), while against-the-rule (ATR) astigmatism predominated posterior (86.0%). Significant positive correlation was found between the astigmatic power vector (APV) of ACA and PCA (Pearson correlation=0.318, P<0.001); TCA and PCA (Pearson correlation=0.204, P=0.025); keratometric astigmatism and PCA (Pearson correlation=0.356, P<0.001); this study also found a positive correlation between primary spherical aberration (Z4°) of the total cornea and PCA (Pearson correlation=0.266, P=0.003); primary spherical aberration (Z4°) of the corneal front surface and PCA (Pearson correlation=0.260, P=0.004); total corneal aberrations (Total cornea root mean square [RMS]) and PCA (Pearson correlation=0.327, P<0.001); total corneal higher-orderaberrations (Total HOA RMS) (Pearson correlation=0.232, P=0.011); total corneal lower-order aberrations (Total LOA RMS) (Pearson correlation=0.250, P=0.006). A positive linear correlation between Q value of corneal front surface and PCA, either 6 mm pupil diameter (Pearson correlation=0.264, P=0.003) or 8 mm pupil diameter (Pearson correlation=0.184, P=0.043) was found in this study.Conclusion: Corneal aberration, Q value (front surface specifically) was essential that we need to take into consideration when we conduct PCA and intraocularlens measurement in clinics.Keywords: astigmatism, posterior corneal astigmatism, aberrations, Q value, Sirius, Scheimpflug photography
format	article
author	Li C Zhang J Yin X Li J Cao Y Lu P
author_facet	Li C Zhang J Yin X Li J Cao Y Lu P
author_sort	Li C
title	Distribution and related factors of corneal regularity and posterior corneal astigmatism in cataract patients
title_short	Distribution and related factors of corneal regularity and posterior corneal astigmatism in cataract patients
title_full	Distribution and related factors of corneal regularity and posterior corneal astigmatism in cataract patients
title_fullStr	Distribution and related factors of corneal regularity and posterior corneal astigmatism in cataract patients
title_full_unstemmed	Distribution and related factors of corneal regularity and posterior corneal astigmatism in cataract patients
title_sort	distribution and related factors of corneal regularity and posterior corneal astigmatism in cataract patients
publisher	Dove Medical Press
publishDate	2019
url	https://doaj.org/article/9e59e9c21cd64eadaa998da1216caa17
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_version_	1718398428343435264

Distribution and related factors of corneal regularity and posterior corneal astigmatism in cataract patients

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