The optical blink reflex protects the eyes from bright light exposure by eliciting blinking (1). This reflex involves sensory input from the retina being transmitted via the optic nerve to the visual cortex located in the occipital lobe (2). Interneurons then relay this visual information to the facial nucleus in the brainstem, which activates the orbicularis oculi muscles via the facial nerve (CN VII) to produce blinking (3).

The optical blink reflex pathway is more complex than the direct trigeminal-facial arc mediating the corneal blink reflex. It has a longer latency period, reflecting the additional neural processing in higher visual centers before activating blinking (4). The optical blink reflex emerges developmentally around 2-3 months of age as the visual cortex matures (5). Lesions in visual cortex can thus disrupt the optical but not corneal blink reflex. Conversely, facial nerve lesions affect both reflex blinks, given the final common efferent pathway (6).