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A person's glasses are two pieces of glass in a frame which they wear to help them to see better.
Glasses is a plural noun. Don't talk about 'a glasses'. Instead say a pair of glasses.
After glasses you use a plural form of a verb. After a pair of glasses you use a singular form.
|Noun||1.||glasses - optical instrument consisting of a frame that holds a pair of lenses for correcting defective vision|
bifocals - eyeglasses having two focal lengths, one for near vision and the other for far vision
frame - the framework for a pair of eyeglasses
goggles - tight-fitting spectacles worn to protect the eyes
lorgnette - eyeglasses that are held to the eyes with a long handle
optical instrument - an instrument designed to aid vision
pince-nez - spectacles clipped to the nose by a spring
dark glasses, shades, sunglasses - spectacles that are darkened or polarized to protect the eyes from the glare of the sun; "he was wearing a pair of mirrored shades"
glasses[ˈglɑːsɪz] npl (spectacles) → occhiali mpl
but a pair of glasses takes a singular verb: A pair of glasses has been found .