A large number of toys will emit colorful light, and some toys are set to blink. Although this kind of toys can attract children's curiosity well, if the baby stares at it for a long time, it is easy to produce visual fatigue. In addition, some studies have found that the red light emitted by toy guns is more harmful to the baby's eyes. If you aim directly at your eyes, your child's vision will become blurred. Therefore, when parents buy acousto-optic toys, it is best to choose products with single light, softness and no flicker.