If the left eye, which has optic nerve damage, is illuminated with light, the light is not projected onto the retina and there is no further reaction, and pupillary constriction is absent in both eyes.
The optic nerve is a bundle of over one million nerve fibers that carry visual messages. There is one that connects the back of each eye (retina) to the brain. Damage to the optic nerve can lead to vision loss. The type and degree of vision loss depend on where the damage occurred.
The optic nerve is a bundle of over one million nerve fibers. Also known as the second cranial nerve or second cranial nerve (CNII), it is the second of several pairs of cranial nerves. It transmits sensory information for vision in the form of electrical impulses from the eye to the brain.
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