[A study of spectral electroretinograms of color vision defects due to macular diseases]

Studies of spectral electroretinograms in central serous chorioretinopathy (CSC) and hereditary macular degeneration (HMD) found that the b-wave amplitudes of CSC for most wavelengths were significantly decreased as compared with normal controls, and the b-wave amplitudes of HMD for most wavelengths were obviously lower than the normal values. Patients of HMD with type-A color vision defects (CVD) showed primarily a reduction of b-wave amplitudes for the full spectrum of 480-620 nm, and patients with type-I CVD a reduction of b-wave amplitudes for wavelengths of 480-560 nm. These differences might reflect differences in damages to the medium-and long-wave length cones.