What are the causes of dry eye?

(1) water layer lacrimal tear lacrimal secretion: is the most common cause of dry eye; congenital absence of lacrimal gland aging lacrimal gland, reduced function or some autoimmune diseases caused by lacrimal gland inflammation trauma infection autonomic dysfunction, long-term point of some eye Pills (such as some of the treatment of fatigue glaucoma drugs stop) or taking certain drugs (such as certain high blood pressure medications, etc.) will cause tear secretion is not enough; easy as long as wearing contact lenses due to reduce the sensitivity of the cornea Affect the secretion of each tear.

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(2) lack of fat layer: due to eyelid disease caused by eyelid sebaceous gland dysfunction.

(3) mucin layer secretion: lack of vitamin A1 chronic conjunctivitis pemphigus chemical burns and so on.

(Such as a long time to concentrate on driving, has been staring at watching TV, computer and reduce the number of blinks) for a long time only in the air-conditioned room work or outdoor strong winds (4) tearing the tear film uneven distribution: eyelid disease caused by poor eyelid blinks The