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Horizontal section of the eye

Horizontal section of the eye
Representation of a horizontal section of the eyeball reveals its three coats: (1) external or fibrous coat (sclera and cornea); (2) middle or vascular coat (choroid, ciliary body, and iris); and (3) internal or retinal layer. The four refractive media are the cornea, the aqueous humor in the anterior chamber, the lens, and the vitreous body.
Graphic 59910 Version 4.0