Blue light blocking glasses with 100% handcrafted natural buffalo horn frames. The night lens blocks 99%+ of blue and green light (380-500nm). Blue light after dark suppresses melatonin production and delays sleep onset. Wearing these in the hour or two before bed lets your body read the light environment correctly and wind down on its own schedule. Each pair is one of a kind due to natural variation in the horn's grain and translucence. Comes with a leather case.