Wash your glasses with mild soap and lukewarm water
Dry them with a clean microfiber cloth
Apply a tiny amount of Vaseline to the scratched area
Rub it in gently with your fingertip or a soft cloth
Wipe off the excess Vaseline completely
Buff the lenses lightly with a microfiber cloth
Repeat only if needed
Stop if the lenses are coated, anti-reflective, or the scratch is deep
Use a professional lens repair or replacement if the scratch remains