It's a masculine plural noun, so you would use it to refer to more than one pair of eyeglasses.
Here are some examples of how it can be used:
* ¿Dónde están mis anteojos? (Where are my eyeglasses?)
* Necesito comprar unos anteojos nuevos. (I need to buy new eyeglasses.)
* Siempre llevo mis anteojos conmigo. (I always carry my eyeglasses with me.)