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The retina. Fromer explained that the retina is the innermost of three tissue layers that make up the eye. The outermost layer, called the sclera, is what gives most of the eyeball its white color. The cornea is also a part of the outer layer.The middle layer between the retina and sclera is called the choroid. 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.
The vitreous is made up mainly of water and. collagen and it has a stiff, jelly-like consistency. As you age the vitreous becomes more watery, less jelly-like and isnât able to keep its usual. shape. As a result, it begins to move away from. the retina at the back of the eye towards the. centre of your eye.