100 to 300 words essay on colour blindness
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Color blindness is the inability to distinguish particular colors. It is generally an inherited trait, but can result from a chemical imbalance or eye injury. ... People with normal vision have three different types of cones, each responsible for a different primarycolor.Special visual cells, called cones, are respon-sible for our ability to see color. People with normal vision have three different types of cones, each responsible for a different primary color.
The absence of particular cones causes the absence of particular colors.
This can be one cause of color blindness. There are four types of color …show more content…
These people tend to confuse blue, yellow, and gray, but not red and green.
Normal vision is called trichromatism. Most color blind people have a version of trichro-matism called anomalous trichromatism. People with this condition can see the same colors as people with normal vision, but not as well.
For example, many people with this common form of color blindness are "green- weak". This means, they see green, but to see the same color normal people see when green and yellow is mixed, more green must be added. "Green-weak" and
"red-weak" are the most prevalent forms of anomalous trichromatism. The "blue- weak" form is rare.
Color blindness can be tested in a variety of ways. The Hardy-Rand-
Rittler and Ishihara tests indicate both the type of degree of color blindness.
In these tests, a variety of shapes, letters, and numbers lie in a jumbled mess of dots. The dots vary in both color and intensity, which cam-ouflage the shapes. A person's ability to detect such shapes directly corresponds with their degree of color blindness.
The absence of particular cones causes the absence of particular colors.
This can be one cause of color blindness. There are four types of color …show more content…
These people tend to confuse blue, yellow, and gray, but not red and green.
Normal vision is called trichromatism. Most color blind people have a version of trichro-matism called anomalous trichromatism. People with this condition can see the same colors as people with normal vision, but not as well.
For example, many people with this common form of color blindness are "green- weak". This means, they see green, but to see the same color normal people see when green and yellow is mixed, more green must be added. "Green-weak" and
"red-weak" are the most prevalent forms of anomalous trichromatism. The "blue- weak" form is rare.
Color blindness can be tested in a variety of ways. The Hardy-Rand-
Rittler and Ishihara tests indicate both the type of degree of color blindness.
In these tests, a variety of shapes, letters, and numbers lie in a jumbled mess of dots. The dots vary in both color and intensity, which cam-ouflage the shapes. A person's ability to detect such shapes directly corresponds with their degree of color blindness.
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