Question: what is are the structural and functional differences between the cornea and the sclera?
Answer: The cornea and sclera make up the outer tunic of the eye. Each is a connective tissue containing collagen fibrils embedded in a proteoglycan-rich extrafibrillar matrix, but whereas the cornea is uniquely transparent, the sclera is totally opaque. ... It is a tough connective tissue and is continuous with the cornea.