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Proceedings Paper

Pupillary escape quantification with an image-processing system in clinical perimetry
Author(s): Ernesto Suaste-Gomez; Palmira Rivera-Arzola; Victor Salazar-Rodarte
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Paper Abstract

We present a new technique to quantify the pupillary escape with an image-processing system during visual field examination in routine ophthalmological practice. Visual field evaluation is important in the detection, diagnosis and assessment of ophthalmologic and neurologic dysfunction. With the conditions during the perimetric study: an initially large pupil and a small step light stimuli, it presents the pupillary escape where the pupil responds with a very fast constriction and then redilates almost back to its original level. In order to measure this response, we obtain automatic and objective determinations for each spot of light in peripheric and central zones. The automatic perimeter is based on the physical dimensions of Goldmann perimeter and the index projector is based on fiber optics target. The pupillary escape and the pupillary response are captured by means of an infrared-sensitive camera and recorded in a VCR to analyze off line with an image processing system. This system consists of a computer equipped with a frame grabber DT2853 and eye movements detector for monitoring the initial position of the eye, during the examination. The algorithms to detect and analyze are: mensuration (area, perimeter, latencies) and matching template based on the stochastic sign change criterion.

Paper Details

Date Published: 17 May 1996
PDF: 10 pages
Proc. SPIE 2673, Ophthalmic Technologies VI, (17 May 1996); doi: 10.1117/12.240072
Show Author Affiliations
Ernesto Suaste-Gomez, Instituto Politecnico Nacional (Mexico)
Palmira Rivera-Arzola, Instituto Politecnico Nacional (Mexico)
Victor Salazar-Rodarte, Instituto Politecnico Nacional (Mexico)


Published in SPIE Proceedings Vol. 2673:
Ophthalmic Technologies VI
Jean-Marie A. Parel; Karen Margaret Joos; Pascal O. Rol, Editor(s)

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