Sudden pain in the eyes is a very common symptom in ophthalmology, mainly due to the following reasons: first, it is caused by the entry of foreign bodies into the eyes, for example, sand is easily blown into the eyes when the wind is sandy. Third, it is caused by electrophthalmia, which is caused by welding light or ultraviolet light irradiation of the eye, and usually has an incubation period of about six hours before the onset of sudden eye pain; fourth, it is caused by iridocyclitis, which is an autoimmune disease that causes eye redness and eye pain; fifth, it is caused by glaucoma, which causes a sharp increase in eye pressure and severe eye swelling and pain.