Why do we often weep: under normal circumstances, tears secreted by lacrimal glands, accessory lacrimal glands would reach balance by its excretory system or evaporation after each nictaion. Tears eyeglasses online will fill the entire surface of eyeball to keep it moist and comfortable and we do not feel tears. When lacrimal glands secreted too much or there’s something wrong with its excretory system so that we would feel our tears. Many factors would lead us secrete too much tears, including our mental stimulation.

The reflex and stimulation of foreign bodies: the effects of cholinergic drugs, anti-cholinesterase agents and other drugs; some eye diseases, such as glaucoma, blepharitis, conjunctivitis, irtis and so on. Or the trigeminal nerve, facial nerve being stimulated. Excessive tear secretion. No time to evaporation or discharge will result in incessant tears.Or the trigeminal nerve, facial nerve being stimulated. Excessive tear secretion. No time to evaporation o

Also, if tears defecation system goes wrong, such as the lacrimal punctum may position wrong, become narrow or close, its duct linking with the nasolacrimal becomes narrow or obstructed, or the tear tract turns dysfuctional, our tears would not be defecat The higher incidence is in the elderly and often present as watering in the wind. And symptoms will be aggravated in cold climates, even often sweep regardless of four seasons in one year, indoor or outdoor.

Snow blindness: it is also known as snow light ophthalmia. It arises mainly because the strong ultraviolet rays in sunlight are reflected to the eye cornea by large area of snow which leads to corneal trauma. Researches eyeglasses have found that if the 300-micrometre UVB rediates to the snow ground, its reflexion will lead to snow blindness when reflected to your eyes. Then it appears to be photophobia, shedding tears, inflammation and pain, itching and a sense of foreign body. Therefore, when going out in snow days, it is best to wear sunglasses to prevent the strong rays reflected by snow field form stimulating the ey

Chronic conjunctivitis: in autumn and winnter, chronic conjunctivitis is one of the major causes leading to tears. Chronic conjunctivitis has two types—-Infectious one and non-infectious one. The former is caused by the inflammation due to pathogens. Bacterium, virus, chlamydia, fungus and so forth will result in it. The occurrence of non-infectious chronic conjunctivitis mainly is connected with environment and the habits of using eyes, its prevalence is increasing. Stimulation such as sand wind, dust, smog, harmful gas and often stay up late, sleep insufficiency, excessive smoking, eyestrain, etc all may cause chronic conjunctivitis.

Xeroma: dry eyes prescription sunglasses results in lachrymation of the elderly. The dry and frigid winter has higher frequency of coming down with xeroma. Xerophthalmia will decrease the tear secretion, the eyes become dry and uncomfortable. If the surface of eyeball is damaged, the eyes will shed large quantities of tears reflexively. Change-of-life women, allergic conjunctivitis patients, the ones with air bubble history when they are young, the ones whose corneas with scar tissues will easily cry due to their dry eyes. Nasolacrimal duct blockage: many elderly often flowing tears is due to nasolacrimal duct blockage. The opening of nasolacrimal duct is near the lower eyelids of nose, and the export is in the nasal cavity.