Seeing the projection in a short time is less harmful to the eyes.
If the projection screen is relatively small, watching the projection for a long time or continuously in a dim environment will increase the eye load, causing problems such as visual fatigue and decreased vision. If you look directly at the light of the projector for a long time, it may stimulate the retina and cause serious damage to the eyes, such as macular edema. If you have visual fatigue, you may have symptoms such as sore eyes and tears. If you use a projector with a small projection screen, watching it for a long time in a dark room may cause vision loss, especially for people with myopia and astigmatism.
If the projector is not used correctly, the light projected by the projector will directly illuminate the eyes, which may stimulate the retina and gradually cause symptoms such as decreased vision and distorted vision. Therefore, when using the projector, we should pay attention to the combination of work and rest to avoid watching the projector for a long time or continuously. In addition, try to choose a projector with moderate brightness and clear picture, and pay attention to the fact that the light of the laser projector can't be directed at the eyes. If you feel unwell, you should seek medical advice promptly.