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Proceedings Paper

Automatic multidiagnosis system for slit lamp
Author(s): Liliane Ventura; Caio Chiaradia; Andre Marcio Vieira Messias; Sidney Julio Faria de Sousa; Flavio Isaac; Cesar A. Cardosa Caetano; Andre Baptista Rosa Filho
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Paper Abstract

We have developed a system for several automatic diagnose in Slit Lamp in order to provide 04 additional measurements to the biomicroscope: (1) counting of the endothelial cells of donated corneas; (2) automatic keratometry; (3) corneal ulcer evaluation; (4) measurement of linear distances and areas of the ocular image. The system consists in a Slit Lamp, a beam-splitter, some optical components, a CCD detector, a frame grabber and a PC. The optical components attached to the beam-splitter are the same for all the functions, except for 1. For function 1, we have developed an optical system that magnifies the image 290X and a software that counts the cells interactively and automatically. Results are in good agreement with commercial specular microscopes (correlation coefficient is 0,98081). The automatic keratometry function is able to measure cylinders over 30 di and also irregular astigmatisms. The system consists of projecting a light ring at the patient's cornea and the further analysis of the deformation of the ring provides the radius of curvature as well as the axis of the astigmatism. The nominal precision is 0,005 mm for the curvature radius and 2 degree(s) for the axis component. The results are in good agreement with commercial systems (correlation coefficient of 0,99347). For function 3, the ulcer is isolated by the usual clinical ways and the image of the green area is automatically detected by the developed software in order to evaluate the evolution of the disease. Function 4 simply allows the clinician do any linear or area measurement of the ocular image. The system is a low cost multi evaluation equipment and it is being used in a public hospital in Brazil.

Paper Details

Date Published: 7 June 2001
PDF: 8 pages
Proc. SPIE 4245, Ophthalmic Technologies XI, (7 June 2001); doi: 10.1117/12.429280
Show Author Affiliations
Liliane Ventura, Univ. de Sao Paulo (Brazil)
Caio Chiaradia, Univ. de Sao Paulo (Brazil)
Andre Marcio Vieira Messias, Univ. de Sao Paulo (Brazil)
Sidney Julio Faria de Sousa, Univ. de Sao Paulo (Brazil)
Flavio Isaac, Univ. de Sao Paulo (Brazil)
Cesar A. Cardosa Caetano, Univ. de Sao Paulo (Brazil)
Andre Baptista Rosa Filho, Univ. de Sao Paulo (Brazil)


Published in SPIE Proceedings Vol. 4245:
Ophthalmic Technologies XI
Fabrice Manns; Per G. Soederberg; Arthur Ho, Editor(s)

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