The main causes of daytime photophobia are the following: 1. conjunctivitis or keratitis, people with inflammation of the eye surface may experience photophobia, tearing and other eye irritation symptoms. The most important thing is that the eye can be treated with a corrective surgery. 3. glaucoma, elevated intraocular pressure, corneal foggy edema, resulting in photophobia and tearing during the day, it is recommended to actively lower the intraocular pressure for symptomatic treatment. 4. dry eye, severe dry eye will appear corneal epithelial lesions, so there is photophobia during the day, it is necessary to often apply local heat and drops of artificial tears without preservatives to assist in treatment.