David Salk, the owner of Blue Logic Lenses and e-clips, walks us through the science and technical parts of blue light as an optician with 50+ years of experience. 

Blue light lenses have been around a decade now. It started with Crizal Prevencia and now everyone has a coating, lens material, tint, etc.

Many internet retailers are completely dedicated to selling blue light like Felix Gray with a healthy business. 

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