Three-dimensional model for human anterior corneal surface

Suilian Zheng; Jinglu Ying; Bo Wang; Zhonghao Xie; Xueping Huang; Mingguang Shi

doi:10.1117/1.JBO.18.6.065002

24 June 2013 Three-dimensional model for human anterior corneal surface

Suilian Zheng, Jinglu Ying, Bo Wang, Zhonghao Xie, Xueping Huang, Mingguang Shi

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Journal of Biomedical Optics, Vol. 18, Issue 6, 065002 (June 2013). https://doi.org/10.1117/1.JBO.18.6.065002

Abstract

The anterior corneal asphericity (Q ) with the tangential radius is calculated, and a three-dimensional (3-D) anterior corneal model is constructed. Tangential power maps from Orbscan II are acquired for 66 young adult subjects. The Q -value of each semimeridian in the near-horizontal region is calculated with the tangential radius. Polynomial fitting is used to model the 360-semimeridional variation of Q -values, and to fit the Q -values in the near-vertical region. Furthermore, a customized 3-D anterior corneal model is constructed. The 360-semimeridional variation of Q -values is well fitted with a seventh-degree polynomial function for all subjects. The goodness of fit of the polynomial function was <0.9 , and the median value was 0.94. The Q -value distribution of the anterior corneal surface showed bimodal variation. Additionally, the Q -values gradually become less negative from the horizontal to the vertical semimeridians in the four quadrants. The 3-D surface plot of the anterior corneal surface approximated a prolate ellipsoid. Using a method to calculate the Q -value with the tangential radius combined with polynomial fitting, we are able to obtain the Q -value of any semimeridian. Compared with general models, this method generates a complete shape of the anterior corneal surface using asphericity.

CC BY: © The Authors. Published by SPIE under a Creative Commons Attribution 4.0 Unported License. Distribution or reproduction of this work in whole or in part requires full attribution of the original publication, including its DOI.

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Suilian Zheng, Jinglu Ying, Bo Wang, Zhonghao Xie, Xueping Huang, and Mingguang Shi "Three-dimensional model for human anterior corneal surface," Journal of Biomedical Optics 18(6), 065002 (24 June 2013). https://doi.org/10.1117/1.JBO.18.6.065002

Published: 24 June 2013

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