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Ocular residual and corneal astigmatism in a clinical population of high school students

PURPOSE: Total refractive astigmatism is usually the first consideration that guides the selection of contact lens type (e.g., spherical or toric), while the ocular source of the astigmatism is a second, but more important consideration, for the final clinical decision. This study was conducted to p...

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Autores principales: Chen, Zhao, Liu, Luoru, Pan, Chenglin, Li, Xiaoning, Pan, Lun, Lan, Weizhong, Yang, Zhikuan
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Public Library of Science 2018
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5890987/
https://www.ncbi.nlm.nih.gov/pubmed/29630629
http://dx.doi.org/10.1371/journal.pone.0194513
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author Chen, Zhao
Liu, Luoru
Pan, Chenglin
Li, Xiaoning
Pan, Lun
Lan, Weizhong
Yang, Zhikuan
author_facet Chen, Zhao
Liu, Luoru
Pan, Chenglin
Li, Xiaoning
Pan, Lun
Lan, Weizhong
Yang, Zhikuan
author_sort Chen, Zhao
collection PubMed
description PURPOSE: Total refractive astigmatism is usually the first consideration that guides the selection of contact lens type (e.g., spherical or toric), while the ocular source of the astigmatism is a second, but more important consideration, for the final clinical decision. This study was conducted to provide detailed data on this topic by evaluating astigmatic components in Chinese adolescents. METHODS: Participants were recruited from healthy high school students undergoing an annual ocular examination at a local hospital. Total astigmatism (TA), corneal astigmatism (CA), and ocular residual astigmatism (ORA) were determined by a Hartmann-Shack wavefront analyzer system (KR-1W, Topcon) with the natural pupil. The axis relationship between CA and ORA was placed into three categories: on-axis, defined as an axis with a difference of 0 ± 10°; opposite-axis, a difference of 90 ± 10°; and the rest defined as oblique-axis. RESULTS: The study consisted of 1,466 students (57.84% girls, age: 16.49 ± 1.05 years). ORA was present in 83.97%, 66.64%, and 45.23% of participants, according to the various criteria for astigmatism (≥ 0.50 D, ≥ 0.75 D, and ≥ 1.00 D, respectively). While with-the-rule was the most common axis orientation for both TA (76.28%) and CA (89.94%), against-the-rule predominated in ORA (93.82%; χ(2) = 1688.544, p < 0.001). Opposite-axis was the major type of axis difference (90.96%) of clinical significance (i.e., ≥ 1.00 D) between CA and ORA, which also prevailed in all levels of TA (range: 56.25–82.26%). CONCLUSIONS: ORA is common in high school students and usually demonstrates a compensation relationship with CA, which should be taken into consideration when determining the design of contact lenses to correct refractive error.
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spelling pubmed-58909872018-04-20 Ocular residual and corneal astigmatism in a clinical population of high school students Chen, Zhao Liu, Luoru Pan, Chenglin Li, Xiaoning Pan, Lun Lan, Weizhong Yang, Zhikuan PLoS One Research Article PURPOSE: Total refractive astigmatism is usually the first consideration that guides the selection of contact lens type (e.g., spherical or toric), while the ocular source of the astigmatism is a second, but more important consideration, for the final clinical decision. This study was conducted to provide detailed data on this topic by evaluating astigmatic components in Chinese adolescents. METHODS: Participants were recruited from healthy high school students undergoing an annual ocular examination at a local hospital. Total astigmatism (TA), corneal astigmatism (CA), and ocular residual astigmatism (ORA) were determined by a Hartmann-Shack wavefront analyzer system (KR-1W, Topcon) with the natural pupil. The axis relationship between CA and ORA was placed into three categories: on-axis, defined as an axis with a difference of 0 ± 10°; opposite-axis, a difference of 90 ± 10°; and the rest defined as oblique-axis. RESULTS: The study consisted of 1,466 students (57.84% girls, age: 16.49 ± 1.05 years). ORA was present in 83.97%, 66.64%, and 45.23% of participants, according to the various criteria for astigmatism (≥ 0.50 D, ≥ 0.75 D, and ≥ 1.00 D, respectively). While with-the-rule was the most common axis orientation for both TA (76.28%) and CA (89.94%), against-the-rule predominated in ORA (93.82%; χ(2) = 1688.544, p < 0.001). Opposite-axis was the major type of axis difference (90.96%) of clinical significance (i.e., ≥ 1.00 D) between CA and ORA, which also prevailed in all levels of TA (range: 56.25–82.26%). CONCLUSIONS: ORA is common in high school students and usually demonstrates a compensation relationship with CA, which should be taken into consideration when determining the design of contact lenses to correct refractive error. Public Library of Science 2018-04-09 /pmc/articles/PMC5890987/ /pubmed/29630629 http://dx.doi.org/10.1371/journal.pone.0194513 Text en © 2018 Chen 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
Chen, Zhao
Liu, Luoru
Pan, Chenglin
Li, Xiaoning
Pan, Lun
Lan, Weizhong
Yang, Zhikuan
Ocular residual and corneal astigmatism in a clinical population of high school students
title Ocular residual and corneal astigmatism in a clinical population of high school students
title_full Ocular residual and corneal astigmatism in a clinical population of high school students
title_fullStr Ocular residual and corneal astigmatism in a clinical population of high school students
title_full_unstemmed Ocular residual and corneal astigmatism in a clinical population of high school students
title_short Ocular residual and corneal astigmatism in a clinical population of high school students
title_sort ocular residual and corneal astigmatism in a clinical population of high school students
topic Research Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5890987/
https://www.ncbi.nlm.nih.gov/pubmed/29630629
http://dx.doi.org/10.1371/journal.pone.0194513
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