Rclaser I don't know if they have Walmarts in Greece but I got polarized sunglasses for $20 that fit over my regular glasses . My prescription glasses have a small frame and lenses though so it would depend on how big your glasses are . These are not the huge sunglasses you see seniors wearing they are smaller and a little better looking [8D] . If you can get either kind it dosen't matter what it looks like if it keeps you from loosing sight of your plane . Here is a link to the brand I have .

http://www.solarshield.com/