When only the eyelid portion of orbicularis oculi contracts, the main effect is to narrow the eye opening. The difference in appearance compared to simply closing the eye has to do with the lower lid. It straightens, rises up the eye, and covers the iris almost up to lower edge of pupil. This is how eyes look in first stage of a smile. There's also a little extra bulge below eyes (A); this is better defined when more of orbicularis oculi contracts.
NEUTRAL EYES FOR COMPARISON
EYELID PORTION CONTRACTED
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