There are many reasons for photophobia and tearing, the common ones are as follows: First, the most common is keratitis or corneal-related lesions, the cornea is at the front of the eye, a transparent membrane, the cornea is innervated by the trigeminal nerve, the sensation is more sensitive, so the inflammation of the cornea or corneal ulcers, corneal epithelial damage, there will be obvious symptoms of photophobia and tearing. Second, it is likely that visual fatigue, staying up late, excessive, long-term use of cell phones, computers, eyes do not get a good rest, resulting in the phenomenon of visual fatigue, resulting in photophobia, watery eyes. Third, it may be conjunctivitis, conjunctivitis can also cause photophobia and watery eyes. Fourth, there may also be dry eye disease caused by various reasons caused by the quality and quantity of eye tears, as well as tear kinetics abnormalities, and manifested as dry eye disease, dry eye disease will often also have photophobia, watery eyes symptoms.