The eyes are complex sensory organs. The eye consists of the eyeball, the upper and lower eyelids, and the conjunctivas.

The inner sides of the eyelids which touch the eyeball, are covered by a thin membrane (the palpebral conjunctiva) that produces mucus to lubricate the eye. The tissue between the skin of the eyelid and the palpebral conjunctiva is filled with glands that secrete sebum, an oily substance that provides additional lubrication for the eye.

Tears are formed by the lacrimal gland in the upper, outer corner of the eye and are collected and drained by the lacrimal sac in the inner, lower corner of the eye. Natural oil for the tears is produced by tiny glands located at the edges of the eyelids.

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