<prompt> Which retinal layer is most radioresistant-RPELayer of rods and conesBipolar cell layerGanglion cell layer  <response>: 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 4E pageno:250 Layer of rods and cones. 