Screen time happens now more than ever during lockdowns, working from home, etc. Our blue light blocking glasses comes in 2 adult sizes: S/M and L/XL. The adult size S/M is recommended for teens and more petite adult faces (usually fits women better than men), and our adult L/XL generally fits larger head sizes (or typically men). Highlights: * Block over 80% of the most harmful blue light rays (under wavelength 420 nm) and 99.9% UVA/B/C rays. * Polycarbonate lightweight, shatterproof, high performance lenses designed for durability. No prescription required! * No harsh yellow/orange colored lenses to distort your vision. * Blue light blocking lenses can also help reduce glare, improve contrast, provide better color perception, and relieve digital eye strain.