Read more Read more What is blue light? Blue light is high-energy light that screens emit that can have negative impacts on our health and wellness. What are the effects of blue light? Digital eye strain, which includes blurred vision, dry eyes, headaches, and eye fatigue. Sleep disruption, which includes difficulty getting to sleep and problems staying asleep. The Felix Gray Embedding Method Clear lenses Filters at highest energy (380-440 nm) Filters at peak screen emittance (455 nm) Filters sleep range (459-484 nm) Quality lenses and longevity Ophthalmic quality Read more Read more Read more Kids Faraday - Black Kids Nash - Whiskey Tortoise Kids Roebling - Spearment Adult Nash - Whiskey Tortoise Adult Roebling - Amber Toffee Adult Faraday - Black Shape Rectanglar Square Circular Square Circular Rectanglar Material Acetate Acetate Acetate Acetate Acetate Acetate Fit Wide Medium Narrow/Medium Medium Narrow/Medium Wide Colors Available Black, Ruby Red, Graphite, Mahogany Whiskey Tortoise, Black, Milky Way, Aquamarine Silver, Gold Whiskey Tortoise, Black Amber Toffee, Sazerac Crystal Silver, Gold Features 3-barrel hinge, Italian Mazzucheli acetate, Standard Nose Bridge Keyhole bridge, 3-barrel hinges, premium italian mazzucchelli acetate Keyhole bridge, 3-barrel hinges, premium italian mazzucchelli acetate Keyhole bridge, 3-barrel hinges, premium italian mazzucchelli acetate Keyhole bridge, 3-barrel hinges, premium italian mazzucchelli acetate 3-barrel hinge, Italian Mazzucheli acetate, Standard Nose Bridge Size 48-16-140 46-16-135 48-17-140 49-17-140 49-18-140 53-17-145