There are a variety of different anti blue light glasses on the market, which can be broadly divided into two categories: film reflection and substrate absorption. The difference between the two is mainly in the level of harmful blue light reduction.
The film reflection type is a film layer on the surface of the lens that reflects short-wave blue light, and the lens itself is colorless and transparent, and the film layer forms blue-violet due to reflection of short-wave blue light.
The substrate absorption mode is to absorb the short-wave blue light by the bleed technique to make the lens have an amber color. The lens is yellowish brown, while the film can be a common green coating.
On the other hand, since the harmful blue light is only a short-wave blue light with a wavelength in the range of 415 to 455 nm in blue light, only the blue film lens reflecting the blue band of this band has the anti-blue light function.
The anti-blue lens is not necessarily blue coated. Whether the lens has anti-blue light function is not determined by the film layer of a certain color. You should choose a professional lens brand, or use a test device that is resistant to blue light blocking, or ask the manufacturer to provide relevant experimental data. Flymoon Computer Reading TR90 Glasses is the glasses with anti blue light function, if you have any interest please take a look.