Information for online test blue light blocking glasses
Visibly colorful light include violet,blue,cyan,green,yellow,orange and red.
Wavelength from 350nm to 750nm.
Wavelength between 350nm to 450nm is violet light,it include purple UV light(Wavelength between 350nm to 400nm) and hyacinthine light(Wavelength between 400nm to 450nm).
99% tinted lenses such as amber,orange,yellow and clear lenses with reflective mirror can block UV light,it can be test with pen-look spotlight and test card,you will find the test card changed the color.
90% computer glasses such as amber,orange,yellow and clear lenses with reflective mirror can block 20% to 50% hyacinthine light between 400nm to 450nm,it can't test online up to now,must need use spectroanalysis instrument to test the percent of blocked.
PS.if you are not use computer long time you only need choose these eyeglasses due to these are low color distortion.
Wavelength between 450nm to 475nm is visible blue lgiht also named blue color.
Wavelength between 475nm to 500nm is cyan lgiht.
20% computer glasses such as amber,orange,yellow and clear lenses with reflective mirror can block 30% to 100%,it can be test online use Light Color Primaries (Red, Green, Blue),
if computer glasses that block 30% blue light you will find 30% cyan color was change to green and 30% magenta was change to red,eyekepper can manufacture these computer glasses use clear lenses with visibly tinted for some customers don't want dark color lenses.
if computer glasses that block more than 80% blue light you will find cyan color almost was change to green and magenta almost was change to red,eyekepper can manufacture these computer glasses use amber or yellow lenses with visibly tinted,it looks like fashion mirroed sunglasses.
if computer glasses that block more than 95% blue light you will find cyan color was change to green and magenta was change to red,eyekepper can manufacture these computer glasses use two tye process,one is yellow or orange lenses with visibly tinted,it looks like fashion mirroed sunglasses too.two is dark orange lenses without any tinted.
