There are several possibilities when the eyes tear at the sight of the sun: 1. The most common one is keratitis. When keratitis appears, there are symptoms of photophobia, tearing and blurred vision, especially after being stimulated by sunlight. You can bring shading glasses, order levofloxacin eye drops 3-5 times a day, and order Bevosol eye drops 4 times a day. 2. Conjunctivitis. Symptoms of conjunctivitis include foreign body sensation, burning sensation, photophobia, tearing, and light stimulation will aggravate these symptoms. You can order levofloxacin eye drops 3-5 times a day and apply levofloxacin eye gel at night before going to bed. 3, dry eye. When dry eye involves the cornea, there can be corneal clouding and corneal epithelial detachment, which can lead to obvious tears when you see the sun. You can order Bevosol eye drops 4 times a day and use calf serum eye gel 2 times a day to coat your eyes.