Crystalline Lens

The lens is a transparent, avascular, biconvex structure. It is suspended between the edges of the ciliary body by the zonular fibers. The pull of the zonular fibers keeps the lens in a flattened condition. Release of tension causes the lens to fatten or accommodate to bend light rays originating close to the eye so that they focus on the retina.

The lens has three principal components (Fig. 23.15):

• Lens capsule, a thick basal lamina measuring approximately 10 to 20 (Jim, produced by the anterior lens cells

• Subcapsular epithelium, a cuboidal layer of cells present only on the anterior surface of the lens

• Lens fibers, structures derived from subcapsular epithelial cells

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