Reduced corneal sensation

Decreased corneal sensation causes a dizziness and affects tear film reconstruction. On the one hand, the reduced corneal perception reduces the nerve impulses that the cornea conducts to the brain system via the reflex arc, leading to a decrease in the nerve impulses that pass from the brain down to the lacrimal gland, and causes a decrease in the secretion of the tear base [15]; Since the blink frequency is positively related to corneal perception, the corresponding blink frequency will be reduced, and the blink is the basis of tear film reconstruction: every blink, the blink movement will evenly distribute tear mucin on the corneal surface. The aqueous layer and lipid layer were evenly distributed on the corneal surface, and the tear film reconstruction was completed. Decreasing the number of blinks will cause the tear to evaporate and affect the uniform distribution of mucin on the ocular surface. As a result, the aqueous layer and the lipid layer will not adhere well, which will affect the tear film reconstruction. Reduced corneal perception is a clinical symptom of exposed keratitis. Exposure keratitis is commonly found in various lesions of incomplete palpebral fissure closure, causing corneal exposure and blink movement disorders, tears cannot properly wet the cornea and corneal epithelial damage occurs.