Referring to or pertaining to the clear moist membrane that covers the inner surfaces of the eyelids and the fronts of the eyeballs.

1. The loose arching folds connecting the membrane lining the inside of the eyelids with the membranes covering the eyeballs.
2. In anatomy, a vaultlike or arched structure.
3. Etymology: fornix is the Latin word for "vault" or "arch".

An uncommon eye cancer that exists in the clear membrane that covers the outer surface of the eye and the inner part of the eyelids: "Conjunctival melanoma, like melanoma of the skin, tends to occur in light-skinned people."

"Features of conjunctival melanoma include fixation of the conjunctiva to the underlying tissue, and increased vascularity and hemorrhage in the conjunctiva."