Eye pain when patients look at cell phones may be related to eye fatigue, dry eye and light stimulation. 1. Eye fatigue: If the patient looks at the cell phone for too long or too close, it can cause the ciliary muscle, extraocular muscle and so on too tired, spasm, the patient can have eye swelling and pain and other discomfort. It is recommended that we do not look at the cell phone for a long time close to ensure that the eyes have enough rest, but also can be appropriate to look into the distance. 2. Dry eye: If the patient concentrates on looking at the cell phone, the number of eye transients is significantly reduced compared to normal eye use, the eyes do not have enough lubrication of tears, resulting in dry eye, the patient may experience eye pain, foreign body sensation, dryness and other discomforts. 3. Light stimulation: some patients have the habit of watching cell phone at night with the lights off, resulting in excessive stimulation of cell phone light to the eyes, which can also cause pain in the eyes of patients. It is recommended that patients who experience pain when looking at a cell phone for a long period of time should consult a doctor in time to assess their condition and follow the doctor’s instructions for treatment.