Color blindness comes in different forms, and people may have it in varied ways. For example, you may only clearly identify dark colors, while another person you know only sees white and black.
The rarest type of color blindness is monochromacy. Only one person out of 33,000 gets this condition. When you have monochromacy, it means you are completely color blind, failing to determine all hues around you. Meanwhile, the majority of people cannot distinguish certain colors only.
Understanding the types of color blindness requires you to understand first the concept of color vision. The first step in how vision works is the hitting of lights onto the photoreceptors of your eyes. These photoreceptors are divided into cones and rods. Cones determine the differences in colors, and rods identify the amount of light you see.
People with normal color vision have three cones that take in light from various regions of the evident spectrum. If you are color blind, you do not have all these cones and cannot completely process the light entering your eyes.
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