Photophobia, also known as photophobia, is usually caused by the following diseases: 1. The most common cause is systemic diseases, especially cerebrovascular diseases, which can lead to photophobia and fear of light, such as migraine, trigeminal neuralgia or facial neuritis, meningitis, epidemic encephalomyelitis, septic meningitis, etc. Clinical symptoms and manifestations of photophobia can occur. 2, Acute inflammatory eye infections such as conjunctivitis, keratitis, sclerositis, corneal ulcers, etc. can also cause photophobia and fear of light.