In order to really play the role of the desk lamp, you should first understand the characteristics of the desk lamp. Otherwise, no matter how good the desk lamp is, if it is used improperly, it will damage the eyes. The light source of the desk lamp is relatively concentrated and has strong directionality. When studying, if the lamp is too close, the light is too strong and may hurt the eyes; if the lamp is far away, the light becomes dim and is easily blocked by hands, head or upper body.