Watching projection does not cause much harm to the eyes, but you need to pay attention to the time of use. The light emitted by a projector is diffuse light. Projector is generally the light projected onto the curtain or wall after the image appears, the eyes see the projector light is diffuse reflection light, less harmful to the eyes. Generally need to pay attention to the laser projector light should not be directed to the eyes, otherwise it may cause some damage to the eyes. The brightness of diffuse reflection light is relatively low compared to the brightness of specular reflection light, and the reflective surface of the diffuse reflection is rough, the reflective surface of the specular reflection is smooth, so the diffuse reflection light is less stimulation of the eyes, and can have a certain effect on the relief of eye discomfort. However, you also need to pay attention to the eye time, to avoid prolonged use and damage to vision. It is recommended that patients who experience eye discomfort should seek medical attention to assess their condition and follow the doctor’s instructions.