Our daytime blue light computer glasses are very different to the add on blue light filter offered by optometrists to put on your prescription lenses. Our ScreenTime clear lens glasses filter blue light by 50% across the whole blue light spectrum and specifically target blue light at 455nm, and for greater protection or DayMax yellow lens completely blocks 100% of the damaging 455nm blue light spike, this is the peak wavelength of blue light emitted from screens and lighting, there is not many blue light glasses for daytime use on the market that do that.
Most computers glasses and coatings applied to prescription lenses filter blue light up to 430nm and none at 455nm so they are pretty useless! The problem with the filter on the prescription lenses if you ask the optometrist the specs of the filter they wouldn’t have a clue, they just call its a generic “blue light filter” with no details at all! I can guarantee you these won't be filtering any blue light past 430nm, as to filter past 430nm you need a pigment embedded in the lens to absorb the blue light, the coating they apply just reflects blue light and that type of coating cant reflect blue light past 430nm.
Not all blue light glasses are created equal so do your research before buying some to ensure they provide adequate protection.