Which retinal layer is most radioresistant-

Rods and cones are the end organs of vision and are also known as photoreceptors. Layer of rods and cones containsonly the outer segments of photoreceptor cells arranged in a palisade manner. There are about 120 millions rods and 6.5 millions cones. Rods contain a photosensitive substance visual purple (rhodopsin) and subserve the peripheral vision and vision of low illumination (scotopic vision). Cones also contain a photosensitive substance and are primarily responsible for highly discriminatory central vision (photopic vision) and colour vision. Ref:comprehensive ophthalamology A k khurana 4/E pageno:250 Layer of rods and cones.