Wash your glasses with mild dish soap and lukewarm water
Dry them gently with a clean microfiber cloth
Apply a very small amount of plain white toothpaste or a tiny dab of Vaseline to the scratched area
Rub gently in small circular motions for 10 to 20 seconds
Wipe off the residue with a clean microfiber cloth
Rinse the lenses with lukewarm water
Dry the glasses completely with a microfiber cloth
Repeat once if needed
Stop if the scratch does not improve
Avoid using abrasive toothpaste, paper towels, or rough cloths
Do not use this on coated lenses unless you know the coating can handle it