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The different anomalous conditions are\u00a0protanomaly<\/strong>, which is a reduced sensitivity to red light,\u00a0deuteranomaly<\/strong>\u00a0which is a reduced sensitivity to green light and is the most common form of colour blindness and\u00a0tritanomaly<\/strong>\u00a0which is a reduced sensitivity to blue light and is extremely rare.<\/p>\nThe effects of anomalous trichromatic vision can range from almost normal colour perception to almost total absence of perception of the \u2018faulty\u2019 colour.<\/p>\n
People with deuteranomaly and protanomaly are collectively known as red-green colour blind and they generally have difficulty distinguishing between reds, greens, browns and oranges. They also commonly confuse different types of blue and purple hues.<\/p>\n
People with reduced blue sensitivity have difficulty identifying differences between blue and yellow, violet and red and blue and green. To these people the world appears as generally red, pink, black, white, grey and turquoise.<\/p>\n
See the dichromacy images below \u2013 about half of people with anomalous trichromacy will see the world in a similar way to those with dichromacy but their ability to perceive colours will improve in good light and deteriorate in poor light. Often their colour perception can be as poor as it is for those with dichromacy.<\/p>\n
People with anomalous dichromacy can have either inherited colour blindness, in which case their ability to see colours will remain the same, or they can have acquired it, in which case their condition could get worse, or possibly improve over time<\/p>\n
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