Corneal reflex disappears

Corneal reflex examination method: The patient looks at one side, and the examiner touches the outer and lower part of the cornea on the opposite side with the softly-twisted cotton wool to prevent the patient from seeing it. The reflex effect causes contraction of the orbicularis oris muscles on both sides, causing bilateral blinking movements. The ipsilateral side is called direct corneal reflection, and the opposite side is called indirect corneal reflection. Reflex arc cornea-trigeminal eye branch-sensory nucleus of central trigeminal nerve-reticular structure-thalamus-cerebral cortex-cortical medulla bundle-bilateral nucleus-bilateral nerve-bilateral orbicularis oris. The disappearance of the corneal reflex indicates that the nerve or brain that forms the cornea is damaged or diseased.