The harm of playing with cell phones on the eyes is mainly reflected in the following three aspects: 1, cell phones and all other man-made electronic products will occur blue light radiation, and blue light radiation on our human eyes is the most direct damage is damage to the tear film. Once our tear film is damaged, there will be obvious symptoms of dry eyes, astringent eyes, red eyes, foreign body sensation, photophobia and other uncomfortable symptoms, which is clinically known as dry eye. Once dry eye is formed, it is a very slow process to relieve. 2, play cell phone for a long time is easy to cause visual fatigue. This is not only because our eyes are swollen and painful, but also because of eye muscle spasm, which may block the normal outflow of atrial fluid, thus secondary to glaucoma.3. Playing with cell phones, especially at night with the lights off, is easy to cause damage to the macular area of the fundus. Once the damage to the macular area is caused, it is basically irreversible.