METHOD AND DEVICE FOR MEASURING RETINAL RESPONSE

摘要

METHOD AND DEVICE FOR MEASURING RETINAL RESPONSE A device for detecting localized retinal damage derives focal responses of the retina(5) from the global response of the retina to patterned stimuli(9) in one's visual field. The stimuli(9) comprises a series of patterns which spatially vary according to a function of a family of orthogonal functions. Each pattern also varies temporally either by being flashed before the patient or by being reversed in contrast at a fixed frequency. An electroretinogram (ERG) or magnetoretinogram (MRG) response(13) of the patient's eye(5) to the series of patterns is fed back into a computer(7) generating the patterns. The responses are used by the computer(7) to determine the coefficients of the transform of the function of the retinal response. The computer(7) calculates the inverse transform associated with the orthogonal functions and provides the retinal response(17) as a function of position on the retina. Contrast, intensity and temporal frequency of the patterns are chosen for a linear response of the eye. Color, intensity and temporal frequency may also be chosen to test different retinal functions. A lock-in amplifier provides the computer(7) the signal amplitude and phase lag of the responses. A signal averager(15) provides the computer an improved signal to noise ratio of the responses.