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Choriod
The choroid is located in the vascular tunic of the eye that provides nutrition through its numerous blood vessels to the internal structures of the eye. It also is capable of absorbing light, which thereby prevents light from scattering throughout the eye.
Lens Cells
The lens cells contain a protein with the cytoplasm called crystallins. The crystallins are closely packed which prevents light from scattering. It is actually the crystallin proteins that make the lens cells cytoplasm completely transparent.
Retina
The retina is the inner layer and neural tunic of the eye. It is composed of many layers of cells making up two-thirds of the eye. For instance, the retina consists of rods, cones and sensory cells. All of these cells of sensitive to light. The rods and cones contain pigments within the cells. These cells are found in the back of the retina. The pigments in the rods and cones prevents light from scattering in the back of the eye.
Cataract
A cataract is a disease of the eye in which proteins in the lens deteriorate and form clouds over the lens of the eye. The lens is no longer able to focus light and pass it through to the back of the eye. Cataracts result in sensitivity to lights or glares, cloudy or blurry vision, difficulty with night vision, double vision, color loss, and in extreme cases, complete loss of vision.