blink reflex
Quick Summary
The blink reflex is a protective mechanism for the eyes. It can be triggered by various stimuli, with two significant reflexes being the corneal reflex and the optical reflex.1
The corneal reflex, initiated by touching the cornea, eyelid, or conjunctiva, is very rapid (0.1-second reflex time). It involves impulses traveling from the fifth cranial nerve to the seventh cranial nerve, which then sends motor commands.1
The optical reflex is slower and is caused by bright light. In humans, the neural pathway for this reflex includes the visual cortex located in the occipital lobe of the brain. Blinking is typically involuntary but can be performed voluntarily.12
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