Which anatomical transition zone marks the boundary between the cornea and sclera?

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Multiple Choice

Which anatomical transition zone marks the boundary between the cornea and sclera?

The boundary between the cornea and sclera is the limbus—the narrow ring around the edge of the cornea where corneal tissue gives way to the sclera and conjunctival tissue. This transitional zone marks where the clear, avascular cornea ends and the opaque, vascular sclera begins, and it also houses the stem cells that maintain the corneal epithelium. Clinically, the limbus is a key landmark in eye anatomy and surgery. The other structures you mentioned are not the boundary between cornea and sclera: the medial canthus is the inner corner of the eye, the lid margin is the edge of the eyelid, and Meibomian glands are oil glands within the eyelids.

The boundary between the cornea and sclera is the limbus—the narrow ring around the edge of the cornea where corneal tissue gives way to the sclera and conjunctival tissue. This transitional zone marks where the clear, avascular cornea ends and the opaque, vascular sclera begins, and it also houses the stem cells that maintain the corneal epithelium. Clinically, the limbus is a key landmark in eye anatomy and surgery.

The other structures you mentioned are not the boundary between cornea and sclera: the medial canthus is the inner corner of the eye, the lid margin is the edge of the eyelid, and Meibomian glands are oil glands within the eyelids.

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