do optical illusions cause damage to you eye? and if so how?
Optical illusions aren't meant to harm you, but in certain conditions they can. It isn't the type of illusion that damages your eye, it is how long you look at them. Illusions are only meant as something fun to puzzle your brain, but there can be side effects.
Optical illusions may cause your eyes to be strained, sore, tired, or itchy. observing optical illusions for too long can cause dry eye or sometimes watery eye problems. Optical illusions have been known to cause headaches, blurred vision, and light sensitivity. While it is not surprising that optical illusions cause difficulty with eye focus as you are observing them, they may also cause focusing issues once you are done looking. As outlined by the Canadian Association of Optometrists, the 20/20/20 rule should be followed. This rule means that if you look at an illusion for about 20 minutes, look at some thing 20 ft away for 20 seconds (and make sure to blink a lot). This rule helps to avoid eye strain or other eye issues.
Some illusions can actually be dangerous. Our sense of equilibrium or balance is located in the inner ear but it works closely with our visual world. When the pilot of an aircraft is flying at night or in a cloud and has no visual reference points it is possible for the pilot to become disoriented. He or she cannot tell whether the plane is gaining or loosing altitude, or turning left or right. This is called vertigo. It is an illusion, and pilots are trained to never rely on their sense of position but to respond entirely to the plane’s instruments.
book: optical illusions by Al Seckel