Which external structure covers half of the iris?

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Multiple Choice

Which external structure covers half of the iris?

Explanation:
The upper eyelid is the external structure that covers part of the iris. When the eye is open, the upper lid drapes over the top portion of the iris, so about half of it is obscured by this lid. This protective movement helps shield the eye and controls exposure of the iris during blinking. The palpebral fissure is the opening between the lids, not something that covers the iris; the pupil is the central opening of the iris; the iris is the colored tissue itself.

The upper eyelid is the external structure that covers part of the iris. When the eye is open, the upper lid drapes over the top portion of the iris, so about half of it is obscured by this lid. This protective movement helps shield the eye and controls exposure of the iris during blinking. The palpebral fissure is the opening between the lids, not something that covers the iris; the pupil is the central opening of the iris; the iris is the colored tissue itself.

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