26.10 The Human EyeThitiltiiltThe eye is an optical system very similar to a camera.Each has a lens, an aperture, and each forms a real, inverted and reduced image.A camera forms an image on film, and the eye forms an image on the retina. Theirisis the colored part of they eyeItThe is the colored part of they eye. It can be blue, brown, gray, green or hazel.The corneais a transparent covering over the lens.The majority of the refraction takes place in the cornea (70%) and the lens (~25%).The lensis the shape of a small bean. It’s about 9 mm tall and 4 mm thick.It is a complex, layered, fibrous mass, similar to a transparent onion. It contains about 22 000 fine layersabout 22,000 fine layers.The index of refraction varies throughout the lens. The average is n = 1.40
has intentionally blurred sections.
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