As nouns the difference between eyeglass and glasses
is that eyeglass is a lens, especially one of a pair while glasses is plural of lang=en.
eyeglass
English
Noun
(es)
a lens, especially one of a pair
a monocle
an eyepiece
Anagrams
*
glasses
Noun
(head)
(pluralonly) spectacles, frames bearing two lenses worn in front of the eyes
Usage notes
* A sight-improving lens for a single eye is a monocle.
* Though confusion is unlikely, clarity as to quantity is improved by using the expressions "a pair of glasses" (or "a pair of eyeglasses") or "(however many) pairs of eyeglasses".
Synonyms
* (spectacles) eyeglasses (US), specs, bioptikon
Derived terms
* John Lennon glasses
* sunglasses
See also
* bifocals
* contact lens
* monocle
* pince-nez
* shades
* varifocals