Automatic keratometry in slit lamps

Liliane Ventura; Cassius Riul; Jean-Jacques De Groote; Sidney J. F. Sousa; Gunter C. Dablas de Oliveira

doi:10.1117/12.697061

5 March 2007 Automatic keratometry in slit lamps

Liliane Ventura, Cassius Riul, Jean-Jacques De Groote, Sidney J. F. Sousa, Gunter C. Dablas de Oliveira

Proceedings Volume 6426, Ophthalmic Technologies XVII; 64261S (2007) https://doi.org/10.1117/12.697061
Event: SPIE BiOS, 2007, San Jose, California, United States

Abstract

We have developed an automatic keratometer module for slit lamp that provides automatic measurements of the radii of the corneal curvature. The system projects 72 light spots displayed in a precise circle at the examined cornea. The displacement and deformation of the reflected image of these light spots are analyzed providing the keratometry. Measurements in the range of 26,8D - 75D can be obtained and a self-calibration system has been specially designed in order to keep the system calibrated. Infrared leds indicate automatically which eye is being examined. Volunteer patients (492) have been submitted to the system and the results show that our system has a high correlation factor with the commercially available manual keratometers and the keratometry measurements from a topographer. Our developed system is 95% in agreement with the corneal topographer (Humphrey - Atlas 995 CZM) and the manual keratometer (Topcon OM-4). The system's nominal precision is 0,05mm for the radii of curvature and 1^o for the associated axis.

Citation Download Citation

Liliane Ventura, Cassius Riul, Jean-Jacques De Groote, Sidney J. F. Sousa, and Gunter C. Dablas de Oliveira "Automatic keratometry in slit lamps", Proc. SPIE 6426, Ophthalmic Technologies XVII, 64261S (5 March 2007); https://doi.org/10.1117/12.697061

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