The patient’s eyes see light very harshly and tears, may be overuse of the eyes, keratitis, conjunctivitis and other factors lead to. 1. Excessive eye use: If patients stay up late or read books or play with cell phones for a long time, resulting in excessive eye use, the eyes do not get a good rest, which may produce visual fatigue, and patients may experience discomfort such as photophobia and watering of the eyes. 2. Keratitis: The cornea is in the front of the eye, innervated by the trigeminal nerve, which is relatively sensitive to sensation. If it is stimulated by inflammation, it may lead to obvious symptoms of stinging when the patient looks at the light, and may be accompanied by symptoms of discomfort such as tearing. 3. Conjunctivitis: Conjunctival tissue usually covers the surface of the white eyeball and the inner surface of the eyelid, if stimulated by inflammation, it may lead to the patient to have a foreign body sensation in the eye, burning sensation, increased secretion and other uncomfortable symptoms, and if the lesion involves the cornea, it may appear photophobia, tearing and other symptoms. It is recommended that patients with significant photophobia and tearing should seek prompt medical attention to assess their condition and follow the doctor’s instructions for treatment.