Abstract: Following from the finding that the spectral pattern ERG responds to both luminance and color, a test was devised that pits one against the other in such a way that a numeric score is derived which reflects the amount of color response required to cancel the luminance response. Contrary to expectations derived from the psychophysical literature on glaucoma, it was found that with the progress of glaucoma less and less color response is required to cancel luminance response indicating that the luminance ganglion cells deteriorate earliest. Tests on populations of normals, glaucoma suspects and confirmed glaucoma patients who do not yet show consistent visual field defects on the Humphrey Test, reveal significantly lower scores on this test for those with confirmed glaucoma than for the suspects and for both suspects and confirmed glaucomas than for the normals. There was no significant difference between test and retest, showing high reliability.

Abstract: The invention features a three path Maxwellian view optical system by which a stimulus test pattern may be ophthalmoscopically placed on small portions of the central 70.degree. of the retina of an eye. In alternative embodiments, different test patterns may be used to obtain data relating to flash ERG, pattern ERG (PERG), or flicker photometry. The location of the stimulus test target on the retina may be tracked and recorded by a spectral perimetry system. The invention further provides a spectral sensitivity measurement system in which electroretinogram (ERG) data is collected, transmitted, processed, and displayed or stored.

Abstract: The invention features a three path Maxwellian view optical system by which a stimulus test pattern may be ophthalmoscopically placed on small portions of the central 70.degree. of the retina of an eye. In alternative embodiments, different test patterns may be used to obtain data relating to flash ERG, pattern ERG (PERG), or flicker photomerry. The location of the stimulus test target on the retina may be tracked and recorded by a spectral perimetry system. The invention further provides a spectral sensitivity measurement system in which electrorctinogram (ERG) data is collected, transmitted, processed, and displayed or stored.