Responses to homogeneous light stimulation were recorded from the isolated perfused retina which at increased light intensity showed increased latency and prolonged duration of activity. They were found graded over a range of intensities which exceeded that for the on-effects. From the early off-effects they could be distinguished by a different spectral behavior. The delayed responses were equally seen in intra- or trans-retinal slow waves and unit activity. The unit activity was recorded from a site external to the ganglion cell layer and may comprise several types of outlasting activity.