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Evaluation of Optical Quality of Corneas Using Corneal Topographers

Maeda, Naoyuki M.D.

doi: 10.1097/01.ico.0000263123.53521.4d
Symposium 1

Purpose To review the evaluation of the optical quality of the cornea by corneal topography.

Methods and Results Color-coded maps show qualitatively the characteristics and severity of irregular astigmatism at the entrance pupil. Topographic indices such as the surface regularity index and predicted corneal acuity are derived from computation of the corneal power distribution, and they are highly correlated with high-contrast visual acuity. Fourier analysis can be used to represent the irregular and regular astigmatism components simultaneously. Zernike polynomials can be used to calculate higher-order wavefront aberrations due to the corneal surface.

Conclusion Evaluation of the optical properties of the cornea using a corneal topographer is useful for assessing quality of vision.

Department of Ophthalmology and Department of Medical Robotics and Image Sciences, Osaka University Medical School, Osaka. Japan.

Address correspondence and reprint requests to: Dr. N. Maeda, Room E7, Department of Ophthalmology, Osaka University Medical School, Yamadaoka 2-2, Osaka 565-0871, Japan. E-mail:

This study was supported in part by grant-in-aid no. 11671737 for scientific research from the Japanese Ministry of Education, Science, Sports, and Culture. and by a research grant from the Osaka Eye Bank Foundation, Suita, Japan. The author has no proprietary or financial interest in the instruments used in the study.

Submitted May 28, 2002. Accepted May 28, 2002.

© 2002 Lippincott Williams & Wilkins, Inc.