There are generally three common specific types of color blindness that can be helped with glasses for colorblind people. This is normally a genetically inherited disorder, however there are times when it can be brought on by chronic illnesses, reactions to medicine, exposure to industrial or environmental chemicals, accidents, and in some cases it can be an age related condition. The three most common types of inherited color-blind diagnosis are Monochromacy, Anomalous Trichromacy and Dichromacy.
When a person has normal full color vision, this means that all three categories of light cones are present and working correctly, this is called trichromacy. It is estimated that 91.5% of the population are trichromats. It is more often a condition affecting men. In fact about 8% of men and only .5% of women worldwide are diagnosed with any form of a color-blind disorder.
Monochromacy, also known as Achromatopsia, patients can see only in black and white with shades of gray. This is a very rare diagnosis. It is estimated that only 1 in 33000 people have this disorder. This disorder leaves people with extreme light brightness sensitivity and most who have this disorder will wear very dark glasses in normal light exposure conditions.
When a person is diagnosed with Anomalous Trichromacy it means that the three categories of light cones are all present however one of them may be operating on a slightly different wavelength than normal. Vision abnormalities will vary depending on which of the three different cones is abnormal. There are, therefore, three differing categories of Anomalous Trichromacy. These are Protanomaly, Deuteranomaly and Tritanomaly. Protanomaly is a lowered perceptiveness to red light. Deuteranomaly is a lowered perceptiveness to green light. Finally, Tritanomaly is a lowered perceptiveness to blue light. Deuteranomaly is the most prevalent diagnosis, while Tritanomaly is the most rare. There are also varying levels of severity for this diagnosis. Some people will experience very minute discrepancies in vision color while others might have a total loss of color.
A diagnosis of Deuteranomaly and Protanomaly is otherwise recognized as a red-green color blindness. These people usually have trouble differentiating between reds, greens, browns and oranges and blue and purple tints are easily confused. A person with Tritanomaly will have a hard time differentiating between blue and yellow, violet and red and blue and green. People with this diagnosis see in reds, pinks, black and white, shades of gray and turquoise.
A diagnosis of Dichromacy means that one cone of the they eye does not function at all, leaving only 2 functioning cones to perceive and interpret the light waves therefore leaving a person with the inability to see a spectrum of color. There are generally three types of Dichromacy, Protanopia, Deuteranopes, and Tritanopes. People with Protanopia will probably confuse black with hues of rad, dark drown with dark green, dark orange and dark red, some blues with some reds, purples and dark pinks and medium greens with some oranges. People with Deuteranopes issues will likely confuse medium reds with medium greens, blue-greens with gray and medium pinks, vibrant greens with yellows, pale pinks with light gray, medium reds with medium brown and light blues with lilac. People diagnosed with Tritanopes Dichromacy typically confuse light blues with grays, dark purples with black and medium greens with blues and oranges with reds.
There are corrective lenses available to help up to 87% of those diagnosed with a color-blindness disorder. Visit www.colorblindcorrectiveglasses.com for more information.