Color blindness
What the human eye sees by stimulating the light in the retina (lining the neural membrane inside the back of the eye). The retina is made up of so-called rods and cones. Rods, located in the peripheral retina, give us our night vision, but can not distinguish between colors. The cones, located in the center of the retina (called the spot), are not much good at night but let’s not see the color during daylight conditions.
Cones, each contain a dye sensitive to light and are more sensitive than a wide range of wavelengths (each color visible is a different wavelength of about 400-700 nm). Genes contain coding instructions for these pigments, and if the coding instructions are wrong, then the wrong dyes will be produced, and the cones will be sensitive to different wavelengths of light (resulting in color deficiency). The colors we see depend entirely on the sensitivity of those pigments.
Many people think that anyone described as “color blind” sees only white and black – like watching a movie or a black and white TV. This is a big misconception and not true. It is very rare that the color is completely blind (monochrome vision – complete absence of any sense of color). There are many different types and degrees called correct color deficiencies in vision.
People with natural cones are sensitive to light pigment (are able to see all the different colors and hidden mixtures of them using cones sensitive to one of the three wavelengths of light – red, green, and blue.) There is a slight color deficiency present when one or more cones are sensitive three light dyes Is not quite right and the peak is removed from its anomalous sensitivity – including red and red spots – and there is a more severe color deficiency present in one or more cones Light-sensitive pigments are really wrong Two-color eyesight – includes green, red, green and red blindness.