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Proceedings Paper

In-vitro corneal transparency measuring system
Author(s): Liliane Ventura; Marcelo Andrade da Costa Vieira; Flavio Isaac; Caio Chiaradia; Sidney Julio Faria de Sousa
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Paper Abstract

A system for measuring the average corneal transparency of preserved corneas has been developed in order to provide a more accurate and standard report of the corneal tissue. The donated cornea transparency is one of the features to be analyzed previously to its indication for the transplant. The small portable system consists of two main parts: the optical and the electronic parts. The optical system consists of a white light, lenses and pin-holes that collimate white light beams that illuminates the cornea in its preservative medium. The light that passes through the cornea is detected by a resistive detector and the average corneal transparency is shown in a display. In order to obtain just the tissue transparency, the electronic circuit was built in a way that there is a baseline input of the preservative medium, previous to the measurement of the corneal transparency. Manipulating the system consists of three steps: (1) Adjusting the zero percentage in the absence of light (at this time the detectors in the dark); (2) Placing the preservative medium in the system and adjusting the 100% value (this is the baseline input); (3) Preserving the cornea and placing it in the system. The system provides the tissue transparency. The system is connected to an endothelium evaluation system for Slit Lamp, that we have developed, and statistics about the relationship of the corneal transparency and density of the endothelial cells will be provided in the next years. The system is being used in a public Eye Bank in Brasil.

Paper Details

Date Published: 7 June 2001
PDF: 4 pages
Proc. SPIE 4245, Ophthalmic Technologies XI, (7 June 2001); doi: 10.1117/12.429281
Show Author Affiliations
Liliane Ventura, Univ. de Sao Paulo (Brazil)
Marcelo Andrade da Costa Vieira, Univ. de Sao Paulo (Brazil)
Flavio Isaac, Univ. de Sao Paulo (Brazil)
Caio Chiaradia, Univ. de Sao Paulo (Brazil)
Sidney Julio Faria de Sousa, 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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