title: Early-stage abnormality of foveal pi mechanisms in a patient with retinitis pigmentosa.
mesh_terms: D000328:Adult; D003118:Color Perception / Q000502:physiology; D003119:Color Perception Tests / Q000295:instrumentation / Q000379:methods; D003117:Color Vision Defects / Q000150:complications / Q000503:physiopathology*; D006801:Humans; D008297:Male; D010786:Photoreceptor Cells / Q000503:physiopathology*; D012174:Retinitis Pigmentosa / Q000150:complications / Q000503:physiopathology*