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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...
Autores principales: | , , , , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
Public Library of Science
2018
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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. |
format | Online Article Text |
id | pubmed-5890987 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2018 |
publisher | Public Library of Science |
record_format | MEDLINE/PubMed |
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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