I evidently scratched or wore out the coating on the eyepiece lens of my 2-7x Leupold VXII, probably from cleaning it improperly or getting solvent on it. It has a kind of "foggy" look on some portions of the lens (not the whole surface, though.) I am sure that I can send it back to Leupold and get the lens replaced, but is there something I can apply to the lens for a temporary fix?

The lens coating are applied in a vacuum chamber and are emitted with a high energy electron gun, or evaporated into the chamber with heat such that they deposit on the lenses. There is no way to fix it yourself, the lens has to be replaced. There are a lot of ways to clean optics and a lot of ways not to clean optics!

jimmypgeorgia: Thanks. I had not been expecting that I could perform a do-it-yourself coating job. I just thought that there might be some temporary way to at least make the scratches disappear until I could get the lens replaced. As to methods of cleaning, I think that the method I used on this lens would be an example of the way not to clean optics.

Send it back, they cannot be repaired without replacing the lens for the reaons mentioned above.

Are you certain the lens coating is damaged? Just in case there is just some contanimant on the lens, try swabbing it with reagent grade (ie pure) alchohol on a cotton swab.