The answer to this question depends on the type of star projector you’re considering. Some FDA-approved laser star projectors are safe for brief and accidental exposure to eyes, but they are not recommended for children. Many of the star projectors in our buying guide are LED projectors instead of powered by lasers.
The U.S Food and Drug Administration (FDA) states that 'The FDA recognizes four major hazard classes (I to IV) of lasers, including three subclasses (IIa, IIIa, and IIIb). The higher the class, the more powerful the laser is and the greater the potential to pose serious injury if used improperly.'
In reference to Class IIIa lasers (like laser pointers or some used in star projectors) the FDA says: 'Depending on power and beam area, can be momentarily hazardous when directly viewed or when staring directly at the beam with an unaided eye. Risk of injury increases when viewed with optical aids.'
If in doubt, check the laser classification on the device before purchasing and check it against the FDA rules, or relevant health and safety body in your region.