PackLight said:A single lens that produces an image with little or no flaw is possible. The human eye has only one lens. Glass and Crystal lenses abilities are flawed in comparison.
It has one structure called a lens, true, but actually the eye can be considered to have at least 4 elements, perhaps better thought of as 4 groups, 3 groups with one element each and one group (the lens itself) comprising multiple elements. The cornea actually does most of the refracting, but both the aqueous humour and vitreous humour have refractive indices that differ from the cornea and lens. The lens itself has a refractive index that varies through the structure, and the action of the ciliary muscles changes the shape of the lens, which alters not only the shape of the lens surfaces, but also the differential thickness of the regions of different internal refractive indices.
So if we assume the eye is producing an image with little or no flaws, understand that it's far more complex than a single-element lens.
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