Title :
Investigation and improvement of corneal topographical analysis
Author :
Wang, Jianyi ; Rice, David A. ; Klyce, Stephen D.
Author_Institution :
Dept. of Biomed. Eng., Tulane Univ., New Orleans, LA, USA
Abstract :
Accurate methods for the analysis of corneal topography are essential for the evaluation and management of corneal refractive errors. Photokeratoscopy is the most common clinical qualitative method to estimate corneal shape. The two-dimensional information on the keratoscope image is insufficient for reconstructing a three-dimensional corneal surface uniquely. The assumptions necessary for calculation lead to errors. The algorithm used in current practice was investigated for these errors. An improved one is proposed that avoids some invalid assumptions. Tested on nonspherical models of known shape, the new algorithm shows four times better accuracy.<>
Keywords :
eye; surface topography measurement; algorithm; clinical method; corneal refractive errors; corneal topographical analysis; errors; nonspherical models; photokeratoscopy;
Conference_Titel :
Engineering in Medicine and Biology Society, 1988. Proceedings of the Annual International Conference of the IEEE
Conference_Location :
New Orleans, LA, USA
Print_ISBN :
0-7803-0785-2
DOI :
10.1109/IEMBS.1988.95335
