Eye pain after wearing glasses for a day may be caused by normal physiological phenomenon, inappropriate prescription of glasses, pupil distance error and other reasons. 1. Normal physiological phenomenon: If it is a new pair of eyeglasses, it needs an adaptation process when you just put them on. It is a normal reaction if there is only a slight eye pain in a short period of time. It is recommended to keep a reasonable eye habit, which can adapt as soon as possible and make the eye pain symptoms disappear gradually. 2. Inappropriate prescription of glasses: If the prescription of glasses is inaccurate, resulting in too high or too low prescription, it may lead to eye fatigue after wearing glasses, thus causing eye pain, possibly accompanied by dizziness, headache and other discomforts. 3. Pupil distance error: If there is an error in the measurement of the pupil distance during the eyeglass fitting, it will also cause eye pain when wearing glasses. You should go to a regular hospital to have regular medical optometry under the guidance of a professional doctor. At the same time, eye pain cannot be excluded from disease factors, such as keratitis, conjunctivitis, scleritis, etc., which can cause eye pain. It is recommended that people with obvious pain should go to the hospital in time, after clarifying the cause, and follow the doctor’s instructions for treatment.