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What is the blue light of digital screen
2018-06-30

Visibly colorful light include violet,blue,cyan,green,yellow,orange and red.
Wavelength from 350nm to 750nm.
color of light
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.

PRIMARY COLORS OF LIGHT AND PIGMENT
First Things First: How We See Color
The inner surfaces of your eyes contain photoreceptors—specialized cells that are sensitive to light and relay messages to your brain. There are two types of photoreceptors: cones (which are sensitive to color) and rods (which are more sensitive to intensity). You are able to “see” an object when light from the object enters your eyes and strikes these photoreceptors.

Some objects are luminous and give off their own light; all other objects can only be seen if they reflect light into your eyes. However, humans can only see visible light, a narrow band of the electromagnetic spectrum (which also includes non-visible radio waves, infrared light, ultraviolet light, X-rays, and gamma rays). In terms of wavelengths, visible light ranges from about 400 nm to 700 nm.

Different wavelengths of light are perceived as different colors. For example, light with a wavelength of about 400 nm is seen as violet, and light with a wavelength of about 700 nm is seen as red. However, it is not typical to see light of a single wavelength. You are able to perceive all colors because there are three sets of cones in your eyes—one set that is most sensitive to red light, another that is most sensitive to green light, and a third that is most sensitive to blue light.

Primary Colors
This is where color can get a little confusing for some folks. There are two basic color models that art and design students need to learn in order to have an expert command over color, whether doing print publications in graphic design or combining pigment for printing. These two color models are:

Light Color Primaries (Red, Green, Blue)

Eyekepper blue blocking glasses

Pigment Color Primaries (Cyan, Magenta, Yellow)
Some of you might be scratching your heads, asking, “Where is the Blue, Red, and Yellow model?” The artist color wheel (based in blue, red, and yellow) predates modern science and was discovered by Newton’s prism experiments. Scientifically, this does not adequately address the true range of spectral color. Upon discovering more about spectral color and  how wavelengths work with surfaces (reflection/absorption) and the human eye, the blue-red-yellow model is shifting to the cyan-magenta-yellow model. We DO, however, still use the RBY model for mixing paints, and it is the most common color wheel students will typically find in art stores.

Additive (Light) Color Primaries
Red, green, and blue are the primary colors of light—they can be combined in different proportions to make all other colors. For example, red light and green light added together are seen as yellow light. This additive color system is used by light sources, such as televisions and computer monitors, to create a wide range of colors. When different proportions of red, green, and blue light enter your eye, your brain is able to interpret the different combinations as different colors.

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