Automated keratometer for slit lamps

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Abstract

An automatic keratometer module for slit lamp was developed and 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° for the associated axis. © Springer-Verlag Berlin Heidelberg 2007.

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APA

Ventura, L., De Groote, J. J., Riul, C., & Sousa, S. J. F. (2008). Automated keratometer for slit lamps. In IFMBE Proceedings (Vol. 18, pp. 425–428). Springer Verlag. https://doi.org/10.1007/978-3-540-74471-9_98

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