Prĕs'by-ō'pi-ă, n.

n. [Fr. presbyopie, from Gr. πρέσβυς, old, an old man, and ὤψ, ὠπός, the eye, face, from the root ὀπ, whence ὄψομαι, fut. of ὁράω, to see.] (Med.) A defect of vision, as in old age, when near objects are seen indistinctly, but distant ones more plainly; — called also presbytia.