Dry eye is a condition in which the eyes do not get enough moisture and lubrication due to reduced tear secretion, changes in the quality of tears or reduced blinking, resulting in symptoms such as dry eyes, burning, foreign body sensation and easy fatigue, mainly manifested as red eyes, stinging pain and increased secretions. Dry eyes are currently divided into two main types – tear secretion deficiency type and tear evaporation overload type. The former is mainly caused by insufficient tear secretion and is mainly seen in patients with lacrimal gland disease, facial nerve palsy, neuroparalytic keratitis, prolonged contact lens wear, trachoma, eye burns, or immune diseases such as systemic dry syndrome, rheumatoid arthritis, and lupus erythematosus; the latter is mainly seen in patients with diseases affecting lipid secretion such as blepharitis, inflammation of the lid gland, or reduced blinking (e.g., computer workers), and eye Patients with a non-smooth surface that affects tear film formation (pterygium, conjunctival laxity, etc.). Some patients with both factors are called mixed and require a combination of treatments. Who is prone to dry eye? 1.The elderly, especially post-menopausal women, changes in hormone levels, resulting in a decrease in tear secretion function; 2.Patients with long-term eye inflammation and allergies; 3.Patients with frequent or long-term use of eye drops; 4.Patients with long-term systemic sedatives, antispasmodics, etc., drugs can lead to a decrease in tear secretion function; 5.Patients who wear contact lenses for a long time; 6.Patients with a history of surgery or trauma to the eye 7, the whole body has immune diseases: such as rheumatoid arthritis, ankylosing spondylitis, lupus erythematosus, dry syndrome; 8, every day for a long time in front of the computer, or air-conditioned environment, long-term work in the environment with smoke, dust, chemical pollution.