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An eyespot, often called a stigma (derived from Greek for spot), is a heavily-pigmented organelle located near the cell membrane that seems to function in light reception in â¦ certain single-celled organisms.
A purpose of the eyelids that you might not think of is that they help keep the surface of the eye moist by spreading tears and other natural secretions. Tears & Secretions. There's a clear, moist membrane that lines the inner surface of your eyelids and the outer surface of the eyeball called the conjunctiva. This delicate membrane secretes mucus, which helps keep your eye moist. Keeping the eye moist is an important job, but because the conjunctiva is a continual membrane, it serves another interesting purpose.