While you probably shouldn't stare directly into it for long periods of time, the laser beam from a mouse is generally safe for vision. Gaming mice fall into two categories: optical and laser. Optical mice use a bright LED, which is no more harmful than any other type of LED light. Laser mice are sometimes preferred due to their versatility over various surfaces (they work on glass and are more sensitive to motion than optical mice). Although laser mice are powerful, the lasers built into them are not strong enough to damage the human retina when used properly.