Research on Biomedical Engineering
http://www.rbejournal.periodikos.com.br/article/5889fb905d01231a018b46ab
Research on Biomedical Engineering
Original Article

POTENCIALES EVOCADOS VISUALES Y RESPUESTAS PUPILARES PARA LA DETERMINACIÓN OBJETIVA DEL CAMPO VISUAL: INSTRUMENTACIÓN Y PROCESAMIENTO

VISUAL EVOKED POTENTIALS AND PUPILLARY RESPONSES FOR OBJECTIVE DETERMINATION OF THE VISUAL FIELD: INSTRUMENTATION AND PROCESSING

Suaste, E.; Rivera, P.; Leybón, J.

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Resumen

En este trabajo se presenta el disefio, desarrollo, implementación y construcción de un bioinstrumento oftalmológico para la evaluación funcional deI campo visual, teniendo como base primordial la cuantificación objetiva, basado en el monitoreo, procesamiento y análisis tanto de imágenes asi como de sefiales de las respuestas pupi!ares causadas por el reflejo fotomotor y de los potenciales evocados visuales (perimetria objetiva).

Palabras clave

Campo Visual, Perimetria Objetiva, Potenciales Evocados Visuales, Respuestas Pupilares, Video-oculografia, Tratamiento de Sefiales e Imágenes

Abstract

It is presented the design, development and construction of an ophthalmologic bio-instrument for visual field functional evaluation purposes. It is based mainly in the objective quantification by monitoring, processing and analyzing of images and pupilar response signals produced for pupil reflex and visual evoked potentials (objective perimetry). Visual evoked potentials (VEPs) and the pupilar responses play an important role in the visual field examination. It is presented the instrumentation and processing developed for obtaining Objective Perimetry. Automatic and Objective Perimeter is based on Goldmann Perimeter and the projector consists of fiber optics. This instrument is equipped with an Electroencephalograph for obtaining the VEPs, Video-oculograph for measuring the pupilar area and an eye position detector on time with the purpose of eliminate false responses caused by eye movements. The system is associated with a PC trough an AIO card, a frame grabber, an infrared camera and a VCR. There have been developed some algorithms of digital image and signal processing. The instrument has been evaluated in our laboratory using an extensive patient analysis and the results have been satisfactory. Simultaneous changes have been recorded in the pupilar area and VEPs with a small light stimulus. This is a new automatic and objective perimetry which eliminates the subjectivity of the patient and Optometrists, also it demonstrates that VEPs and pupilar responses are objective methods and indicators ofthe visual field and the sensibility thresholds.

Keywords

Visual Field, Objective Perimetry, Visual Evoked Potentials, Pupilar Response, Video-oculography
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Links & Downloads

Res. Biomed. Eng.

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