System and Method for Vision Examination using Interrupt Signals for Synchronizing Visual Evoked Potential Sampling Rate with Visual Stimulus

摘要

A system and method for performing a vision examination includes displaying a series of visual stimuli in a line by line pattern display for observation by a patient and detecting the patient's visual evoked potential in response to the visual stimuli. Electrical signals representative of the visual evoked potentials for each stimulus of each series of visual stimuli displayed is converted to digitized data, recorded and measured. The measured evoked potential data is then evaluated and compared to certain predetermined values in order to detect whether or not the measured data is reliable. The presentation of visual stimulus is synchronized with the rate of sampling the responsive visual evoked potential signals by determining if a predetermined specific line of the line by line display has been displayed and by generating interrupt request signals to a computer in order to initiate the sampling of the visual evoked potential signals and to reflash the contents of a video RAM for the next frame of image displays.