Often seen in a number of literary works, use this word of bright eyes to describe people's eyes pretty. Actually, eyes can’t separate form the moisten of water, cheap eyeglasses and the water moisten eyes was the tear secretioned by lachrymal gland and accessory lacrimal gland.

Normal persons, in conscious and calm state, secrete tears 0.5-1.0 ml per 16 hours. In the excitement and mood swings, the secretion in their eyes can be increased significantly. If the amount of tear secretion reduces, caused eyeglasses by various reasons, or phenomenons of eye dryness, acid bilges, burning and other symptoms due to abnormal tear quality come out, it indicates that the eyes need "water". This medicine is called dry eye, also known as ocular sicca, autumn and winter season should be given to the eye, "overtime pay" to avoid suffering from this disease.

Then, why do eyes need "water" so much? How to "fight drought" for the dry eyes?

Actually, xerophthalmia is not sole disease, reading glasses but causes by several kind of different completely causes of disease that take the eye dry and tear little as characteristic. Their pathogenesis is different, the pathology process and the clinical manifestation are also different. Divides into three types according to the cause.

Substantive conjunctiva and corneae xerosis: widespread conjunctiva scar, destroyed conjunctiva's secretion gland and the cup-shaped cell, even tear gland, tear-duct. Such as serious trachoma stage Ⅱ, Ⅲ, thermal or chemical extensive burns, severe chronic conjunctivitis, pemphigoid, etc. The long timely stimulation of sans and winds, dusts and smokes, long timely watch TV, use computer and wear contact lenses are the common reasons that cause chronic conjunctivitis.

Mouth and eyes dryness arthritis syndrome or called dry eye syndrome:this is a unclear etiology of disease ,recently,it is found that the possibility is innate immune system abnormalities It it the immune response induced by acquired antigen stimulation. Main symptoms are keratoconjunctivitis sicca, dry mouth and concurrent connective tissue disease.

Under the stimulus of antigenic, cause the immune response. The main performance is keratoconjunctivitis sicca, xerostomia and the concurrent connective tissue diseases. For infants and nestlings, it can be found mostly in the case of inappropriate artificial feeding and malabsorption or among sufferers of the consumptions like measles, pneumonia, dysentery, diarrhoea and so on. For adults, it can be found mostly among su

Although the cause each kind of xerophthalmia is different, the treatment is different, but the just right for the illness treatment is the same, that is use artificial tear fluid to supply the tear fluid secretion insufficiency. For example eye drops can help you to keep the eyes moist, moreover the eye drops can alleviate dry eye discomfort when wearing contact lenses.

Though medicament can ease the dry of eyes in different degrees and make our eyes moistened, we should notice that manmade tears are just a symptomatic treatment, and they can’t effect a radical cure. So in the course of treatment, people should understand their causes as soon as possible, actively carry out the treatment in terms of the cause, for example, if it is a lack of vitamin A which will induce conjunctival epithelial xerosis, vitamin A should