It's "binoculars are". Since this noun only has a plural form, it's not correct to say "binoculars is".

It's "binoculars are". Since "binoculars" only has a plural form, it's not correct to say "binoculars is".

Where are my binoculars?

Where is my binoculars?

Similarly, when using the synonym "field glasses", we need a plural verb.

Your field glasses are on the shelf. (not "is")

My field glasses have red lenses. (not "has")

Being a plural noun, this word takes a plural pronoun or determiner (them, they, those, these, etc.).

These are called binoculars. Never use them to look at the sun.

Those binoculars are too expensive.

We cannot use the article "a" with this object, but you can introduce the expression "a pair of binoculars" (or "a pair of field glasses"), which requires a singular form of a verb.

There is a pair of binoculars on the bed.

There are a pair of binoculars on the bed.

Follow the same strategy with the following object names; thus, we say: "glasses are", "goggles are", "headphones are", or "sunglasses are".