A congenital disorder of color perception, especially a partial one, is discovered by chance, since it usually doesn’t bother a person. There is no pain, normal vision, the color in the distinguished spectrum of a person sees the same from the very birth and he was unaware that someone sees them differently. Of course, if the child constantly draws the gray sun or yellow leaves on the trees, you should watch him and possibly reduce him to an ophthalmologist. Although it may be a manifestation of children's imagination. By the way, D. Dalton discovered a protanopia at 26 years old. Until that time, she did not bother him at all.
Another thing is the acquired lack of color perception, in which case the patient begins to see colors differently than before, and, of course, immediately pays attention to this.
Protanopia and deuteranopia - the non-perception of the red or green parts of the color palette. Such dichromacies are among the most frequent features of color sensitivity. At the same time, the protanop can distinguish green from blue and even from dark red, but magenta (a mixture of blue and red) cannot turn blue. To determine the form of color blindness, you need to turn to specialists who have at hand a tool for testing color perception.
Partial anomalies of color vision, when the activity of one of the color pigments is only reduced, are even more common. The most common is deuteranomalia, when chlororuba activity is weakened, and a person does not perceive some shades of green, for example, does not see the difference between light green, olive and turquoise, however, it can distinguish green from red, yellow or blue.
If a person does not distinguish purple from crimson and pink, however, he sees them as red, that is, he still differs in three primary colors, then he most likely has protanomaly - the erythrolab activity in cones is reduced. But, nevertheless, tricolor vision is present.
If you have diagnosed protanopia, then getting a driver's license even for personal use (without the right to work for hire) is unlikely to work out. In the XXI, the rules for issuing rights to people with color perception disorders have become tougher. Even protomanalya is currently an obstacle to obtaining a driver's license. Although the final word for the oculist.
To diagnose dichromatic disorders of color perception, including such as protanopia, there is a Rabkin test - special pictures with the so-called color cipher. Normal trichromats do not need to answer the question of what they see in the picture. People with deviations in color sensitivity usually cannot see the encrypted images on these pictures.
The US military uses Ishihara plates to diagnose color perception disorders. There is also a device for detecting anomalies of color sensitivity - an anomaloscope. To install such a diagnosis should be specialists.