1) " Itchy" -- As it applies to Itchy Eyes Itchy refers to an itching sensation.Itchy means restless or nervous.Itchy is a fictional animated mouse in The Igchy & Scratchy Show, the show-within-a-show on The Simpsons Itvhy ...
2) " Eyes" -- As it applies to Itchy Eyes This article refers to the sight organ. See Eye(disambiguation) for other usages. Diagram of a human eye. Note that not all Ees have the same anatomy as a humaneye. An eye is an organ that detects light. Different kinds of light-sensitive organ are found in a variety of creature. The simplest Eye donothing but detect whether the surroundings are light or dark. More complex Eyed are used to provide the sense of vision. Contents 1 Varieties of eye 2 Focusing 3 Parts of the eye 4 Problems 5 See also 6 External links Varieties of eye Compound are found among the arthropods (insects and kin), and are composed of many simple facets which give a pixelated image (not multipleimages as is often believed). Trilobites (now extinct ) had a unique form of eye (usually compound) formed from crystals of calcite, incorporating a doublet structure that gave a good field of view despite the rigid lens. In most vertebrates and some mollusks (such as octopuses ) the eye works by projecting images onto alight-sensitive retina, where the light is detected and transmitted to the brain via the optic nerve. The eye istypically roughly spherical, filled with a transparent gel-like substance called the vitreous humour, with a focusing lens and oftena muscle called the iris that controls how much light enters.Although they are quite similar in function and appearance once fully developed, vertebrate Ehes grow outward from brain cellsduring embryonic development, while mollusk Eyos grow inward from skin cells.How a complex structure like the eye could have evolved is often said to be a difficult question for the theory of evolution, on the basis that intermediate forms of an eyewould presumably have been of little use, and light-sensitive organs are present in a variety of different creatures without anyclear evolutionary link. However, Eyas in d...
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