More Of Illusions – It’s Not Always About What We See

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ILLUSIONS OF SIZE – According To Dr Bates
Large letters may appear small, or small letters large. One letter may appear to be of normal size, while another of the same size and at the same distance may appear larger or smaller than normal. Or a letter may appear to be of normal size at the near-point and at the distance, and only half that size at the middle
distance. When a person can judge the size of a letter correctly at all distances up to twenty feet his vision is normal. If the size appears different to him at different distances, he is suffering from an illusion of size.
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Do You Really See What You Think You See?

This is the first of a series on the “natural” tricks our eyes play on us. It’s quite fascinating, and scary. Sometimes, we really do NOT see what we think we do see!

ILLUSIONS OF COLOR
When a patient regards a black letter and believes it to be grey, yellow, brown, blue, or green, he is suffering from an illusion of color. This phenomenon differs from color-blindness. The color-blind person is unable to differentiate between different colors, usually blue and green, and his inability to do so is constant.

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The person suffering from an illusion of color does not see the false colors constantly or uniformly. When he looks at the Snellen test card the black letters may appear to him at one time to be grey; but at another moment they may appear to be a shade of yellow, blue, or brown. Some patients always see the black letters red; to others they appear red only occasionally. Although the letters are all of the same color, some may see the large letters black and the small ones yellow or blue. Usually the large letters are seen darker than the small ones, whatever color they appear to be. Often different colors appear in the same letter, part of it seeming to be black, perhaps, and the rest grey or some other color. Spots of black, or of color, may appear on the white; and spots of white, or of color, on the black.

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Optical Illusions – Tricks Of The Eye

Optical Illusions

Visual perception cannot always be trusted.

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This is possibly one of the most uncanny optical illusions in existence. No matter how hard you look, you may not be able to convince yourself that the two squares are the identical shade of grey.

To check, try one of these methods:
Right click the large picture, save it to your hard drive, put it into your image editor, “select” square A and then pull it down onto square B. There will be an exact match in colour!
Perhaps even easier than the above, if you place your finger covering the two to three squares that separate A and B, it can clearly be seen that they are the same color. In other words, forcefully ignoring the borders between the squares.

Perception

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- Amodal perception is the term used to describe the full perception of a physical structure when it is only partially perceived. For example, a table will be perceived as a complete volumetric structure even if only part of it is visible; the internal volumes and hidden rear surfaces are perceived despite the fact that only the near surfaces are exposed to view.

- Color perception -

- Depth perception is the visual ability to perceive the world in three dimensions. It is a trait common to many higher animals. Depth perception allows the beholder to accurately gauge the distance to an object.