Cell phone brightness how much does not hurt the eyes there is no absolute standard, cell phone brightness is generally to adapt to the surrounding environment for the best, that is, similar to the brightness of the surrounding environment. When the brightness of the cell phone is too bright compared to the surrounding environment, the radiation stimulation of the user’s eyes will increase, and at the same time, the blue light produced by the bright screen will also damage the retina, affecting the user’s eyesight. When the brightness is too dark, the user wants to see the content of the phone screen will need to dilate the pupils, and excessive adjustment will promote eye fatigue, there is a possibility of increasing myopia, so the brightness of the phone should be adapted to the surrounding environment. Users should pay attention to adjust the brightness of the cell phone at the same time, should also control the time to play the cell phone, long-term face of electronic products, will make the eyes overly fatigued, poor posture may also cause damage to other parts. It is recommended that long time use of cell phone eye discomfort in a timely manner to consult a doctor to assess the condition, and follow the doctor’s instructions for treatment.