why is vision lost when light hits the blind spot

Eye is a sensory organ of vision, which enables us to see the
objects. In humans, two eyes are situated in the orbital cavity of
the skull, the eye balls of the eye are supported by a number of
accessory structures. The wall of the eye ball is a three layered structure, and it
contains,
в The outer fibrous layer (or tunica externa or tunica fibrosa): в Middle vascular coat (or tunica media or tunica vsculosa): This layer covers the eyeball completely, except pupil.


It includes choroid, ciliary body, and iris. в The inner nervous coat (or tunica interna or tunica nervosa or retina). Light is only interpreted when it excites photocells in the back of the eye located on the retina. These photocells are called rods and. Light is only interpreted when it excites photocells in the back of the eye located on the retina.


These photocells are called rods and cones. The blind spot is a place on the eye where the optic nerve (the nerve which brings the visual information to the occipitial lobe of the brain) connects to the eye. Because of this nerve there are no rods OR cones here and thus no photocells to interpret the light hitting the eye in that area.


Anya got the types of vision mixed up. Scotopic vision is vision that is due to the activity of the rods of the retina only; it is the type of vision that occurs at very low levels of illumination, and it can detect differences of brightness but not of hue. Photopic vision is vision in bright light, mediated by cone cells of the retina; daylight vision.

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