角膜塑形术后角膜面形分析及周边离焦研究

刘宝凯; 刘永基; 谢培英; 郭曦; 谷健达; 于浩

doi:10.37188/CO.2019-0248

Volume 13 Issue 4

Aug. 2020

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Chinese Optics > 2020 > 13(4): 770-777.

LIU Bao-kai, LIU Yong-ji, XIE Pei-ying, GUO Xi, GU Jian-da, YU Hao. Analysis of the corneal surface and peripheral defocus after orthokeratology[J]. Chinese Optics, 2020, 13(4): 770-777. doi: 10.37188/CO.2019-0248

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LIU Bao-kai, LIU Yong-ji, XIE Pei-ying, GUO Xi, GU Jian-da, YU Hao. Analysis of the corneal surface and peripheral defocus after orthokeratology[J]. Chinese Optics, 2020, 13(4): 770-777. doi: 10.37188/CO.2019-0248

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Analysis of the corneal surface and peripheral defocus after orthokeratology

doi: 10.37188/CO.2019-0248

LIU Bao-kai^{1, 2
,},
LIU Yong-ji^{1, 2
,
,},
XIE Pei-ying³,
GUO Xi³,
GU Jian-da^{1, 2},
YU Hao^{1, 2}

1.
College of Electronic Information and Optical Engineering, Institute of Modern Optics, Nankai University, Tianjin 300350, China
2.
Tianjin Key Laboratory of Micro-scale Optical Information Science and Technology,Tianjin 300350, China
3.
Peking University, Optometry & Ophthalmology Center, Beijing 100027, China

Funds: Supported by Natural Science Foundation of Tianjin (No. 19JCYBJC16800); Fundamental Research Funds for the Central Universities, Nankai University (No. 63191105)

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Corresponding author: yjliu@nankai.edu.cn
Received Date: 24 Dec 2019
Rev Recd Date: 21 Jan 2020
Publish Date: 01 Aug 2020

Abstract

Abstract

A new method of corneal shape analysis method is proposed. It not only eliminates the influence of corneal thickness on the shape of cornea after orthokeratology, but also reflects the asymmetry of a cornea. A reference surface is introduced into the analysis of the height data of the anterior surface of the cornea to eliminate the influence of corneal thickness. On the basis of above, anterior surface of the cornea is divided into the optical zone, transition zone and peripheral zone. The results show that the optical zone diameter is (1.9±0.27) mm, and the curvature radius is (8.32±0.38) mm; the transition zone diameter is (6.56±0.38) mm, and the curvature radius is (7.48±0.55) mm; the curvature radius of the peripheral zone is (10.49±1.83) mm. After orthokeratology, the horizontal refraction of the transition zone is lower than its vertical refraction. The refraction of the nasal side is greater than that of the temporal side and the refraction of the upper side is greater than that of the lower side. A semi-customized eye model is established based on the obtained parameters and the results show that its peripheral defocus is myopic after orthokeratology and its defocus is asymmetrical in each direction, which is consistent with clinical observations.
- orthokeratology lens,
- division of cornea,
- peripheral defocus,
- partition algorithm,
- eye model

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References(30)

References

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