Which cells are absent in the physiological blind spot?

The physiological blind spot, also known as the optic disc, is a specific area on the retina where the optic nerve fibers exit the eye. This area lacks photoreceptors, which are the sensory cells responsible for vision. In the context of the blind spot, both rods and cones are absent, leading to a lack of visual perception in that particular region of the retina.

Rods and cones are crucial for detecting light and color; rods are primarily responsible for vision in low-light conditions, while cones are essential for color vision and visual acuity in brighter light. Since the optic nerve exits through the optic disc, this region does not have either type of photoreceptor, resulting in the characteristic blind spot where visual information is not detected.

Understanding the physiology behind the blind spot helps clarify why there is a lack of perception in that area. Thus, the correct answer accurately reflects that there are no rods nor cones present at the site of the physiological blind spot.