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It is composed of three concentric layers (also called coats) with different structures and functions. The tough outermost layer of the eye is known as the fibrous layer and is composed of two fused but physically quite different structures: Sclera â white of the eye. Cornea â window of the eye.
The cornea is a transparent structure found in the very front of the eye that helps to focus incoming light. Situated behind the pupil is a colorless, transparent structure called the crystalline lens.A clear fluid called the aqueous humor fills the space between the cornea and the iris. The 7 Biggest Mysteries of the Human Body ]. Behind the cornea is a colored, ring-shaped membrane called the iris. The iris has an adjustable circular opening called the pupil, which can expand or contract to control the amount of light entering the eye, Fromer said. Ciliary muscles surround the lens.