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Optical Illusions
Optical illusions are visual images that differ from reality imagery. Literal optical illusions are different from the original images, physiological illusions are afterimages that follow a bright light, and cognitive illusions are unconscious inferences like distorting. Ask questions here about perception, depth, color, brightness, and patterns.
413 Questions
Sometimes i see a kaleidoscope effect in my vision what is this?
I thought I was going blind. I went to Eye, Ear, Nose and Throat and the doctor told me it is a migraine. It is called kaleidoscope migraine according to the doctor.
Where is the hidden tiger in the hidden tiger optical illusion?
The hidden tiger is found in the tiger's stripes.
Why is Olivia wearing glasses?
because when she was a small child, she got some hot beef jerky and it got stuck on her face which means she is paranoid about sharp objects now.
very sad story i know.
How long does it take atropine eye drops to wear off?
Just stopped using Atropine following eye surgery. The doctor says that it will be two weeks before the effects wear off. Be prepared for heightened sensitivity to the sun or bright lights until then.
What part of the brain optical illusions affect?
Optical illusions are created by giving the visual cortex in the occipital lobe conflicting information. When the visual cortex tries to sort out the conflicting information received from the eyes, it must make a decision about which pattern or information to process and which pattern or information to disregard.
There are multiple types of optical illusions. There are those that are real and the effect actually exists because of various physical phenominon, mostly assosiated with optics, and there are the type that cause our senses to be fooled. I will address the latter. What creates an optical illusion is different depending on the set up. Some are created by the eye itself and others are created by the brain's interpretation of the eye's messages. Some examples. A negative after-image. This is what you see when you stare at a certain picture for a very long time. The rods and cones in your retena become tired after the same messages are repeatedly fired. The "after immage occurs when you then look at something else. The cones and rods of the retena continue to fire but the tired reciever's signal is not as powerful. This means that you do not pick up certain colors. This lack of some colors causes the negative after image. Another illusion is the common "spinning wheel" illusion. Where a circle is created by sucessive radial lines. The eye is always moving in very small ammounts, even when you try to keep it still. When you move the eye tries to keep track of the lines using many small jumps. These jumps trigger the brain to experience the strobeoscopic effect which causes it to believe there is motion when there is not. Yet another type of popular illusion is created by creating a false perspective. These are commonly known as "Magic Eye" illusions. When the picture is held out of focus at the correct depth, the two different pictures that each eye sees overlap. This is the same thing that our eyes do to see immages in 3-D. The brain takes the two perspectives and adds them together. In this case it is fooled. The pictures overlap and the brain adds them together to create a 3-D immage. These are just a few explanations why optical illusions work as they do. Each and every type of illusion utilyses a different effect created by they eyes and brain.
What you describe is a painting by René Magritte.
cross-eyed means that both your eyes look towards your nose or both look outwards symmetrically. Instead of both your eyes looking to the right, left or straight ahead. (In other words cross-eyed means that one of your eyes looks to the left and the other looks to the right!)
