PRIMALS Blue Light Blocking Glasses vs Zenni Optical Blokz

Buy the PRIMALS if your goal is sleep and heavy evening screen use. Its red lenses block up to 99.9% of blue light, and owners report falling asleep faster and less eye strain, though most need about a week to get used to the tint. The Zenni Blokz is the better everyday pair: a normal-looking square frame with anti-reflective coating and full UV protection, but it blocks blue light only up to 420 nm, so it filters less of the high-energy range.

• Choose the PRIMALS if you wear glasses mainly at night before bed, want maximum blue light blocking, and can accept a strong red tint.
• Choose the Zenni Blokz if you want one pair for all-day wear that looks ordinary, cuts glare with anti-reflective coating, and also blocks UVA and UVB.