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17 May 1996 Pupillary escape quantification with an image-processing system in clinical perimetry
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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.
© (1996) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Ernesto Suaste-Gomez, Palmira Rivera-Arzola, and Victor Salazar-Rodarte "Pupillary escape quantification with an image-processing system in clinical perimetry", Proc. SPIE 2673, Ophthalmic Technologies VI, (17 May 1996);


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