Why are eyes dry?

Dry and astringent eyes may cause eye fatigue due to excessive eye use, leading to dry eye syndrome. The reasons are as follows:

First, insufficient tear secretion, which may be due to an imbalance of tear gland secretion. Or systemic endocrine disorders.

Second, the evaporation is too strong, such as staring at a fixed target at close range for a long time or turning on the air conditioner for a long time, or the weather is dry in winter and spring.

Third, some components in tears are abnormal, such as abnormal lipid secretion.

Fourth, other reasons, such as long-term use of eye drops containing preservatives or sequelae of eye surgery.

Therefore, you must pay attention to developing good eye-use habits, avoid reading books or looking at electronic products for a long time, pay attention to the balance between work and rest, close your eyes and rest for ten minutes every hour of working or studying. You can also do regular eye exercises. Dry eyes are mainly caused by the following reasons:

1. Insufficient tear secretion from the tear gland: This is the main cause of dry eyes. Common factors include tear gland function caused by aging. Reduces tear secretion, causing dry eyes. Autoimmune diseases such as Sj?gren's syndrome cause the tear glands to shrink, which can lead to dry eyes. Long-term wearing of contact lenses and intellectual and neurological disorders can also lead to dry eyes. Long-term use of certain eye drops, such as certain medications for treating glaucoma, or taking certain medications can also cause a decrease in tear secretion from the tear glands, thus causing symptoms of dry eyes.

2. Insufficient secretion of the tear lipid layer: Mainly seen in eyelid diseases, resulting in meibomian gland dysfunction, which can lead to reduced oil secretion, causing the intima to evaporate too quickly, leading to symptoms of dry eyes. In addition, long-term use of electronic products can reduce blinking and cause tears to evaporate too quickly, causing symptoms of dry eyes.

3. Insufficient secretion of mucin: For example, chronic conjunctivitis, pemphigoid, chemical burns, etc. can lead to insufficient secretion of mucin in tears, thus causing dry eyes. .