The sclera and cornea form the fibrous tunic of the bulb of the eye; the sclera is opaque, and constitutes the posterior five-sixths of the tunic; the cornea is transparent, and forms the anterior sixth.

The term "corneosclera" is also used to describe the sclera and cornea together.

[1] This article incorporates text in the public domain from page 1005 of the 20th edition of Gray's Anatomy (1918)

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