Check whether the lenses are glass or plastic before trying anything
Gently clean the lenses with mild soap and water
Dry with a clean microfiber cloth
Try a small amount of non-abrasive toothpaste on a soft cloth
Rub lightly in small circles for a few seconds
Rinse thoroughly and dry with a microfiber cloth
Try a baking soda and water paste on a soft cloth
Rub gently, then rinse and dry
Use a lens-specific scratch remover if available
Avoid abrasive cleaners, paper towels, and rough cloths
Avoid using vinegar, bleach, or ammonia-based cleaners
If scratches are deep, replace the lenses or glasses
Take them to an optician for professional advice