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Journal of Biomedical Optics • Open Access

Three-dimensional model for human anterior corneal surface
Author(s): Suilian Zheng; Jinglu Ying; Bo Wang; Zhonghao Xie; Xueping Huang; Mingguang Shi

Paper 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.

Paper Details

Date Published: 24 June 2013
PDF: 6 pages
J. Biomed. Opt. 18(6) 065002 doi: 10.1117/1.JBO.18.6.065002
Published in: Journal of Biomedical Optics Volume 18, Issue 6
Show Author Affiliations
Suilian Zheng, Wenzhou Medical College (China)
Jinglu Ying, Wenzhou Medical College (China)
Bo Wang, Nanjing Univ. of Finance and Economics (China)
Zhonghao Xie, Wenzhou Medical College (China)
Xueping Huang, Wenzhou Medical College (China)
Mingguang Shi, Wenzhou Medical College (China)

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