The curvature measurement of the human eyeball |
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Authors: | Yun Long Lay Rong Seng Chang Pei-Wen Chen Ming-Chang Tu |
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Institution: | aYLL is in the National Chin-Yi Institute of Technology, Department of Electronic Engineering, No. 35 Lane 215, sec. 1 Chun Shan Road, Taiping, Taichung, Taiwan, Republic of China;bRSC and P-WC are in the Institute of Optical Science, National Central University, Chung-Li, 32054 Taiwan;cM-CT is in the Department of Ophthalmology, Chang Gung Memorial Hospital Republic of China |
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Abstract: | The curvature of the cornea in the ophthalmology field is essential data, especially for humans when they are being tested for wearing contact lenses, or for patients undergoing refractive surgery by either knife or laser. It is extremely difficult to measure the curvature of the eye precisely because the measurement of the cornea, using a contact tool, is not possible. In this paper, we propose a method to measure the curvature using lens aberration theory and an image processing technique. We project a circular grating, known as a Placido disc, on to the cornea. The reflective image does not have equal divisions and this distortion value contains the curvature information. |
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Keywords: | distortion aberration image processing curvature ophthalmology Placido disc |
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