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AssigneeDiopsys, Inc.
InventorGeorge Z. Hu
Estimating the term…
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.
A system for performing a medical examination comprising:
A method for performing a vision examination comprising:
A method of synchronizing the presentation of a series of sensory stimuli with the rate of sampling visual evoked potential signals in response to visual perception of said sensory stimuli in a system for performing vision examinations having a visual stimuli generating device controlled by a computer graphics card with a line comparator in which said series of the sensory stimuli are a plurality of patterns, each pattern in said series comprising a line by line visual image and differing from the other pattern of said series, and in which said series is displayed to each eye of a patient for generating and detecting electrical signals representative of said patient's visual evoked potentials, said method of synchronizing comprising detecting the presentation of a particular line of said visual image, initiating display of a next pattern in said series upon detection of said predetermined line, resetting said line count to zero, detecting whether a preset count in said graphics card line comparator has been reached, and generating an interrupt request signal to the CPU of said computer.
Dependencies are inferred from the claim text.