MANFRED KAGE / SCIENCE PHOTO LIBRARY. MANFRED KAGE / SCIENCE PHOTO LIBRARY.
Horizontal section through a normal human eye, showing relative size of component structures. The 3 layers comprising the wall of the eye are visible; the outer sclera (red stain), the middle choroid (black) & inner retina (pink, the light- sensitive layer). The optic nerve enters at left, where the retina thickens to form the optic disc. At right, the oval, heavily-stained lens is located between the ciliary body (stained black, at top and bottom). To right of ciliary body is the iris (stained pink, acting as an adjustable diaphragm for the lens). At right (the front of eye) is the cornea, the transparent window into the eye (pink). Mag. X2 (6x7), X0.87 (35mm).
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