Answer :
The anterior cornea and the posterior sclera make up the fibrous tunic of the eye.
The cornea and sclera make up the fibrous layer. The outer five-sixths of the eyeball is covered by the sclera, an opaque covering. The anterior one-sixth of the eyeball is taken up by the transparent cornea, which is anteriorly continuous with the sclera.
The cornea is the front, clear section of the eye's fibrous tunic. At a point known as the limbus, it is continuous with the sclera. The smooth, nonkeratinized squamous epithelium keeps the cornea transparent in healthy conditions, and the precorneal tear film, the absence of corneal vascularization or pigmentation, the size and regular arrangement of the collagen fibrils that make up the corneal stroma, and the relative dehydration of the cornea all contribute to this (which is maintained by the endothelium and epithelium). The cornea can develop vascularization, pigmentation, fibrosis, an accumulation of cellular or noncellular infiltration, and/or edema in response to harmful stimuli.
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