When talking about an object that you wear in front of your eyes to help you see more clearly, the noun glasses is a plural noun.
When talking about an object that you wear in front of your eyes to help you see more clearly, the noun glasses is a plural noun. These nouns only have a plural form and are grammatically plural.
After taking out her contact lenses, she put on her glasses.
After taking out her contact lenses, she put on her glass.
Plural nouns are also known as pluralia tantum (Latin for "plural only"). They frequently, but not always, involve objects that have two parts.
Where are my reading glasses?
John took off his glasses.
Remember, plural nouns take a plural form of a verb; for example, we say "glasses are" (not "glasses is").
Your glasses are in the drawer.
Your glasses is in the drawer.
Since these nouns are uncountable, you cannot use the article "a" or numbers with them. But you can introduce the word "pair" to make them countable (e.g., "a pair of glasses", "two pairs of glasses", etc.)
Linda has a new pair of glasses.
Linda has a new glasses.
A partial list of other plural nouns:
