Here's a breakdown of the word:
* "okulary" means "glasses" in general.
* "przeciwsłoneczne" means "against the sun".
So, "okulary przeciwsłoneczne" literally means "against the sun glasses".
You can also use the more informal "słoneczne" instead of "przeciwsłoneczne", which means "sunny". So you would say "okulary słoneczne".