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Proceedings Paper

Automatic keratometry in slit lamps
Author(s): Liliane Ventura; Cassius Riul; Jean-Jacques De Groote; Sidney J. F. Sousa; Gunter C. Dablas de Oliveira
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Paper 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 1o for the associated axis.

Paper Details

Date Published: 5 March 2007
PDF: 11 pages
Proc. SPIE 6426, Ophthalmic Technologies XVII, 64261S (5 March 2007); doi: 10.1117/12.697061
Show Author Affiliations
Liliane Ventura, Univ. de São Paulo (Brazil)
Cassius Riul, Univ. de São Paulo (Brazil)
Jean-Jacques De Groote, Univ. de São Paulo (Brazil)
Sidney J. F. Sousa, Univ. de São Paulo (Brazil)
Gunter C. Dablas de Oliveira, Univ. de São Paulo (Brazil)

Published in SPIE Proceedings Vol. 6426:
Ophthalmic Technologies XVII
Bruce E. Stuck; Fabrice Manns; Per G. Söderberg; Michael Belkin M.D.; Arthur Ho, Editor(s)

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