what chroma and color bind see

First of all, what is chroma?

If you remember from your junior high school physics teacher, you probably remember lens imaging.

If you’ve long forgotten it, don’t worry. If you have a magnifying glass handy, take it out. Facing the window, facing the wall, adjust the distance (from the wall). When the distance is right, you will be able to see the view from the window on the wall.


The image outside the eye is projected onto the retina through the focus of the lens (magnifying glass).

There are two types of cells in the retina. Luminance cells and color sensing cells, which send light messages to our brains.

There are 120 million brightness cells (rods) evenly distributed in the retina and they are very sensitive to light.
Colour-sensing cells (cones) are the cells responsible for our color vision. Only about 6 million.

Colour-sensing cells are divided into three types, each of which responds differently to colored light sources. Each color sensing cell has a specific color absorption curve, which has a peak at different points in the chromatogram.

S-cone: Sensitive to short wavelength light, peak 420nm
M-cone: Sensitive to medium wavelength light, peak 530nm
L Cone: Sensitive to long wavelength light, peak 560nm

These three different types of color information are mixed together to make up our color vision. This is also why we want to mix all the visible colors together with only three primary colors, since we only have three sources of information to mix our entire color spectrum.

Colors are shown on the horizontal axis, and brightness is perceived by the color cells on the vertical axis.

The three solid lines, from left to right, represent how the blue, green, and red cells perceive different colors. (The dotted line is the brightness cell. But the brain doesn’t use it to judge colors.)

When there are fewer cells in one type of color vision, the color is weak.

Like the existence of myopia and farsightedness, weak color is also divided into red weak, green weak, blue weak, mixed weak, full weak color.
Just as myopia can distinguish between 100 degrees and 200 degrees, there are degrees of chromaticity, 10 degrees, 20 degrees, 30 degrees, up to 100 (color blindness)
70% of the people with abnormal color vision are mild or moderate color weakness.

What can you see with weak color?

Believe the popular science that passes afore-mentioned, you won’t resemble before in that way, think the world in the weak eye, non black namely white.

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The color is weak can distinguish red yellow green blue pink.Even severe chromaticity (monochromopsia), which is rare, is not black or white.

Apparently, severe chromaticity can only distinguish three colors (including white). They will see different lights as different colors (caused by education), and they will see certain colors as gray.

About color vision correction

Since it is a certain color sense cells less, so can you enhance the brightness of this color light to achieve correction?

B: Sure. In fact, that’s what weak-colored glasses do. Color enhancement is achieved by reducing the brightness of other colors.

Color correction glasses is only effective for mild and moderate chromaticity, and ineffective for severe chromaticity and color blindness. Anyone who claims to be able to cure color blindness when wearing it is a liar.