physiological optics
Among the various factors that significantly affect the composition of products, occupies a special place physiological optics, in particular the perception of the eye line and three-dimensional forms. Human eye tend to succumb to an optical illusion.
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Designer in the process of product design and merchandise in the process of assessment must take into account this feature of visual perception and to make consequential amendments to the form, called optical adjustments.
Optical adjustments (illusion) has studied and used in antiquity.
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About these wonderful events, like wanting to undermine confidence in us the feelings, he wrote, for example, the Roman poet and philosopher-materialist, I century BC Titus Lucretius Carus in his poem "On the Nature of Things." Optical illusions in nature and in various fields of creative activity often lead to embarrassing errors.
Solutions
Many prominent scientists, artists, architects, solution of this problem have focused on. The first attempt to scientifically explain the optical illusion was the work of I. Oppel. Significant contribution to the study of this problem have physics and psychology of the second half of XIX century, including H. Helmholtz, Poggendorf, Kundt, Hering, B. Wundt, Titchener, Zollner, Jastrow. Need to adjust the shape is caused primarily optical-geometric illusions: the revaluation of the vertical size in comparison with the horizontal, contrast, visual distortion of straight lines at their intersection inclined or when pairing with compass lines, etc..
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The human eye is much better to assess the dimensions of width than height and depth.