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- The Best Reading Glasses Ultra Blue Light Filter Glasses
Blue light is a type of visible light that has a short wavelength but high energy, it is not only comes from the nature, but also comes from the electronic devices' display like smartphone, computer, and tablet PC. It is part of the electromagnetic spectrum, which includes radio waves, microwaves, infrared radiation, ultraviolet radiation, X-rays, and gamma rays. Blue light has a wavelength that ranges from 400 to 490 nanometers (nm) and is located between violet and green light on the spectrum.
The 280-445 nm high energy light may cause macular degeneration, premature aging of your eyes and even eye cell death. However, the 445-500 nm "Good" blue light, useful for various treatments (sleep disorder, seasonal depression, etc.).
One of the benefits of Blackview BG801 and BG802 is they can block up to 99.44% harmful blue light, at the same time offering up to 92.5% light transmittance, but other brands' product only offering 60% light transmittance, this greatly reduces visibility or clarity.
Blackview blue light blocking glasses' lenses appear yellow. Why? Optically, in the principle of complementary colors, if blue light is removed from the white light normally seen, it will appear yellow. Thus, the darker the yellow lenses are, the more efficiently they block blue light. But there is a limit.
Blackview BG801 was designed for elegant, it has a black frame, the style is more suitable for reading and working. And BG802 was designed with a fashion style, it's a pair of blue light blocking sunglasses.
They are durable. Ingenuity in details. The delicate reinforced hinges are durable with up to 5,000 times testing that is flexible and smooth to open and close, and these hinges have a reputation for being easy to fix. And more features are waiting for you to discover.