The patient’s eyes are afraid of light, i.e. photophobia, which may be caused by conjunctivitis, keratitis, inverted eyelashes and other diseases. 1. Conjunctivitis: Conjunctivitis is an inflammatory disease that occurs in the conjunctival tissue, the causes of which include infection, immunopathology and external stimuli, etc. Under the stimulation of inflammation, patients may experience conjunctival congestion, itching, and increased secretion, and some of the patients may also have the manifestation of photophobia. 2. Keratitis: Keratitis is an inflammation of the cornea caused by exogenous or endogenous pathogenic factors, when the cornea’s defense ability is weakened, external pathogens or their own diseases can lead to corneal inflammation, patients may experience eye pain, photophobia, tearing and other symptoms. 3. Inverted eyelashes: patients with inverted eyelashes may experience discomfort such as photophobia, tearing and eye pain due to the abnormal growth direction of the eyelashes and the irritation of the eye surface tissues. 4. Others: In addition, patients with uveitis and pupil dilators may also experience discomfort such as photophobia and tearing. It is recommended that patients with pronounced photophobia consult a doctor to evaluate their condition and follow the doctor’s instructions for treatment.