Photostimulator for electrophysiological examination of the human eyesight system - project based on Altera Max+Plus II system and Flex 10K20 device

Abstract

In the paper the projects of two photostimulators for electrophysiological examination of human eyesight system are presented. First one produces various visual stimuli of pattern type (according to the appropriate standards): checkerboards, vertical and horizontal bars of different localization on the screen and of the adjustable light and time-space parameters. The generated images (pattern) can be displayed on the VGA monitor. Second one generates stimulus fields for multifocal electroretinography. Each field of the image blinks according to a appropriate m-sequence. The whole digital circuitry of the devices is placed into ALTERA FLEX20K10 PLD chip. The design process of presented devices was supported by Altera CAD system MAX+PLUS II. Running prototypes of the photostimulators was verified using UPI Education Board.