It's "sunglasses are" (not "sunglasses is"). Remember, this object consists of two parts joined together, and only has a plural form.
It's "sunglasses are" (not "sunglasses is"). Remember, this object consists of two parts joined together, and only has a plural form.
My sunglasses are polarized.
My sunglasses is polarized.
Follow the same practice with other verbs, such as look, fit, have, etc.
Her sunglasses have certified UV protection. (not "has certified...")
Conversely, when introducing the expression "a pair of sunglasses", we use a singular verb because the word "pair" implies a single entity.
There is a pair of sunglasses on the shelf. (not "There are...")
Keep also in mind that we always use plural determiners (these, those, both, many, a few, etc.) or pronouns (they, them, etc.) with plural nouns, like "sunglasses".
Those sunglasses are chic! Where did you buy them?
A partial list of other objects that consist of two parts and take "are" can be found below:
