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Is the cornea covered by conjunctiva?

No, the conjunctiva ends at the corneo-scleral junction. The epithelium of the conjunctiva becomes continuous with that of the cornea 

Drs plz, I can't imagine "the conjunctiva". I want some pictures, thanks in advance

Drs please what is the (stye) and what is the (chalazion) ?? Thank you.

A chalazion and a stye are both lumps in or along the edge of an eyelid. In some situations it may be difficult to distinguish between a chalazion and stye.
A stye often appears as a red, sore lump near the edge of the eyelid, caused by an infection of the glands of Zeis at the base of the eyelashes or glands of Moll.
A chalazion forms when the meibomian gland becomes enlarged and the gland opening becomes clogged with oil.