(plural) optical instrument consisting of a frame that holds a pair of lenses for correcting defective vision
"She adjusted her glasses to get a clearer view of the tiny text on the menu."
plural of glass
"The bartender poured two glasses of whiskey and slid them across the bar to us."
In plain English: Glasses are clear lenses held together by a frame that you wear on your face to help you see better.
"She put her glasses on to read the menu."
Usage: Use "glasses" when referring to frames worn on the face to correct vision or protect eyes from light. Do not use it to mean a drinking vessel, which is always singular ("a glass").
Third-person singular simple present indicative form of glass
"She does not know how to glass the windows in her new apartment."
In plain English: To glasses means to look at something closely and carefully.
"The heavy rain began to glass the windows, making them look like mirrors."
Usage: Do not use "glass" as a verb to mean wearing eyewear; instead, use the noun phrase "wear glasses." The verb form simply means to make or cover something with glass.
Derived from Old French glas (glass), the term originally referred to pieces of glass used as lenses before evolving into the plural noun for eyewear. The singular form was historically rare, with the dual sense of two separate lenses driving the modern usage.