Illusions can be caused by Visual Stress
by EO Executive Optical | March 27, 2015 at 02:21am

You know how, after watching too much TV or probably just staring at something bright or brightly colored, right after you shift your eye to look at something else or close them momentarily, you see an after image or a “splatter” of colors in a place that isn’t there? Or how you thought the contact lenses for sale are defective because, every time you take them out, you start seeing floating light globs? Here, try the Hermann Grid to see how quick the stress happens.

Notice how, even though each intersection is really just white if you focus on one of them (c’mon, try focusing on just ONE intersection), there seems to be black dots that begin to populate the whole board that disappear just as quick when you shift your eyes elsewhere on the screen.

These types of illusions are called Physiological Illusions and they are illusions that exploit the incapacities of the eyes. Don’t get the word “exploit” wrong; it just means that they are based on tiring your eyes out by stimulating a single eye context like brightness, contrast, or size, so much that the stress starts to make you “see things.” This is actually part of your eyes’ evolutionary make up so you can perceive reality at a more practical view.

Do you think color blind people will also be prone to the illusions like that of above? Tell us what you think on the comments and has a physiologically illusory day!