What does an on-centre receptive field do when light reaches its periphery?

In an on-centre receptive field, the photoreceptors located in the periphery are organized to inhibit the ganglion cell. Consequently, when light reaches the periphery of this field, it causes an inhibition of the cell's background discharge.123

This centre-periphery organization is physiologically significant because it allows the visual system to prioritize changes in illumination, such as the movement of a light or dark spot or the detection of contours, rather than responding to uniform light across the entire field. When light is removed from the periphery, the inhibition is released, often resulting in a pronounced "off-response" or discharge.123