You wear glasses on your nose to see better. Wear glasses, reading glasses, a new pair of glasses.
They are always plural and take a pair — a pair of glasses, not a glasses — like trousers and scissors. Lenses bend light to move the focus onto the retina, which is all correction is. Reading glasses become necessary for nearly everybody after about forty. Note spectacles, the formal word, and specs, the informal one.
1nounglassesLenses worn in front of the eyes to see better.
“She can't read the menu without her glasses.”
glasses is an eyewear item.
Also accepted in games: spectacles, eyeglasses