Snow blindness and electro-optical ophthalmia are caused by watching welding without glasses, or after watching ultraviolet light, they have the same cause and cause the same symptoms, there may be a foreign body sensation, photophobia, tearing and blepharospasm, as well as conjunctival congestion, corneal epithelium pitting and so on, details are as follows: 1, foreign body sensation, photophobia, tearing and blepharospasm: there will be a strong sense of a foreign body or tingling sensation, as well as photophobia, tearing, Blepharospasm and other symptoms. The patient usually comes to the hospital by a chaperone, the patient’s two eyes basically can not open, groping forward, so the symptoms are actually very typical. 2, conjunctival congestion, corneal epithelium pitting: if the examination is carried out, it will be found that the conjunctiva congestion, corneal epithelium pitting, which is due to ultraviolet rays on the corneal epithelium of the necrosis, detachment of the corneal epithelium caused by. Generally speaking, the symptoms will be reduced or cured after 24-48 hours, the treatment is mainly symptomatic treatment of anti-infection, to promote the healing of the corneal epithelium, you can take some oral medications or cold compresses to reduce pain.