This fold is lightly stretched over the edges of the eyelids, and forms, as it were, a third palpebra of a crescentic shape.    From Wordnik.com.  [Journal of the Third Voyage for the Discovery of a North-West Passage] Reference

The aperture is in consequence rendered somewhat pyriform, the inner curvature being very obtuse, and in some individuals distorted by an angle formed where the fold crosses the border of the lower palpebra.    From Wordnik.com.  [Journal of the Third Voyage for the Discovery of a North-West Passage] Reference

Vertitur in solitos palpebra clausa polos.    From Wordnik.com.  [William Lilly's History of His Life and Times From the Year 1602 to 1681] Reference