Cone and rod responses in nutritionally induced retinal degeneration in the cat.

All cats fed a specific semipurified diet developed a retinal degeneration. In the early stageselectroretinograms (ERG's) from both the cone and rod systems were reduced in amplitude;those from the cone system were delayed in implicit time while those from the rod systemwere normal in implicit time. These ERG changes, as well as the findings on ophthalmoscopicand light microscopic examination, were consistent with the idea that initially...