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Proceedings Paper

Effects of the cornea and the crystalline lens on the aberrations of the complete eye
Author(s): Wei Wang; Zhaoqi Wang; Yan Wang; Tong Zuo
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Paper Abstract

In order to understand the relative contribution of the wave-front aberrations of the cornea and the crystalline lens to the retinal image quality in the human eye, we have measured the wave-front aberrations of the anterior corneal surface, the posterior corneal surface and the complete eye with a corneal topographic system (Orbscan) and a Hartmann-Shack wave-front sensor. The 20 subjects selected to participate in the study are all no eye diseases, covering a range of age from 18 to 25. All the subjects have refractive errors of defocus varying from 0.5 D to 5 D and astigmatism varying from 0.1 D to 1.5D. Using the Orbscan, we obtained the discrete set of corneal elevation data in radial distribution over the pupil plane for the anterior and the posterior corneal surfaces directly, and the data are then transformed into wave-front aberrations of both the corneal surfaces. The wave-front aberrations of the two surfaces are then used to acquire the aberrations in whole cornea. The aberration contribution of the crystalline lens is obtained by subtracting the aberrations in the cornea from that in the complete eye. It is shown that the combination of the aberrations between the crystalline lens and the cornea could be either a compensatory or an additive process. The effect of the combination between the anterior and the posterior corneal surface is also complicated, and the aberration compensation, as well as aberration addition can be observed. It is shown from statistics point of view that the anterior corneal surface contributes more lower-order aberrations (astigmatism) to the complete eye, while the posterior corneal surface and the crystalline lens play a more important role in contributing higher-order aberrations.

Paper Details

Date Published: 8 June 2006
PDF: 6 pages
Proc. SPIE 6018, 5th International Workshop on Adaptive Optics for Industry and Medicine, 60180D (8 June 2006); doi: 10.1117/12.669276
Show Author Affiliations
Wei Wang, Nankai Univ. (China)
Zhaoqi Wang, Nankai Univ. (China)
Yan Wang, Tianjin Eye Hospital (China)
Tong Zuo, Tianjin Eye Hospital (China)


Published in SPIE Proceedings Vol. 6018:
5th International Workshop on Adaptive Optics for Industry and Medicine
Wenhan Jiang, Editor(s)

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