If it is just the coating you may be able to have it stripped and replaced,
it is more likely the material beneath is scratched and new lenses are
needed

If you have pretty basic lenses, they aren't that expense to replace.  
Last I heard, my HMO charges US$25 each.  Frames are generally much more
expensive than that.

If you're on good terms with whomever provided you with them, they might
still be under warranty, which means they might replace them no cost.

If not, try having the coating stripped off.  I've seen horrible looking
lenses look like new after stripping a bad coating.

If the lens substrate is scratched, you need new lenses.

w.stacy, o.d.