Photophobia is an eye condition that occurs when a person suddenly enters a brightly lit area from darkness, and the bright light irritates the eyes, causing pupil constriction and a headache, a phenomenon known as photophobia. Some patients also experience pain and tearing in response to light. It is common in congenital aniridia, albinism, etc. In addition, eye diseases, such as conjunctivitis, keratitis, iritis, uveitis, etc. may appear photophobia symptoms. If the pupil is dilated, such as after trauma or the use of dilating drugs after the stimulation of sunlight, there will also be obvious photophobia phenomenon.