The NIH-ERG ganzfeld stimulator.

The design specifications of a NIH-ERG ganzfield stimulator is discussed. Based on a proposed standard for clinical electroretinography, the stimulator uses stroboscopic stimuli as a whole field flash. But by varying the parameters of wavelengths and background illumination, a complete isolation of the rods and cone systems of the retina is obtained. This information is invaluable at times in early detection and diagnosis of retinal dysfunctions.