frames

Mounting that supports the lenses and holds them in place in front of the eyes.

reading

Lower part of a bifocal lens that corrects farsightedness.

rim

Part of the frames that surrounds and supports the lens.

distance

Upper part of a bifocal lens that corrects nearsightedness.

bifocal lens

Glasses with two parts: one to correct farsightedness and the other for nearsightedness.