If you see a black square at the first image then your glasses block all blue light.
Blue cut lenses test online.
Give your eyes a break if you re worried about how computers and other blue light emitting screens are affecting your eyes you can find relief without.
If your red lens glasses are not blocking 100 of light between 400 550nm then return them or do not buy them.
The blue component has disappeared.
This will be interesting to test but if you only need to block the blue light you need some deep yellow or a little orange tint like this.
These lenses offer sharper vision and reduce the symptoms of eyestrain that are caused by a prolonged computer exposure.
So test your glasses with the test pictures at the beginning of this article.
As you can see the cyan component of the spectrum which is a mix between blue and green appears green.
The image on the left represents a regular rgb color model.
The blue cut filter coating in pellucid blue lenses cut down the harmful uv rays completely along with a major portion of hev blue light protecting our eyes and the body from potential danger.
If you have normal color perception and your monitor can display rgb the two images shown above should appear different.
How to test blue light glasses the only way to know if you have the best blue light glasses for evening use ones that have orange or red lenses is to ask the company for a spectral report.
True blue blocking glasses or lens that filter out 90 blue light the two spectra should appear very similar.
Image released to public domain but link to this article for attribution.