Verifying vision perception of colors

Color Blind Test - Can You Actually See All The Colors? (Health And Medical Video April 2018).

According to statistics, various forms of color-blindness (violation of perception of color) suffer from 2 to 8% of men and about 0.4% of women.

Daltonism is a rather common visual impairment in which the eye can not distinguish between green, red, or blue, or several colors at once.

The point is that cone cells of the three species located on the retina can only perceive one color - red, blue or green. If the cells of one of these types are absent or their activity is broken, the eye ceases to distinguish the corresponding color.

Usually violations of perception of colors are inherited or associated with diseases of the optic nerve and retina.

Daltonism is hereditary and acquired

The acquired color blindness - a phenomenon more rare than the genetic predisposition to disturb the perception of colors. As a rule, it is associated with internal nerve diseases, eye trauma, as well as aging processes.

If the cause of color blindness becomes a genetic defect, the disease is inherited as a recessive symptom attached to the X-chromosome, which is why men are more likely to see color blindness than women.

Types of violations of color perception

  1. Full color blindness occurs quite rarely - about 0.01% of people. In other cases there is a partial loss of the ability to perceive certain colors.
  2. Suffering from color perception violations, like people with normal eyesight, for the full description of the visible color, use the three basic colors. At the same time they are worse distinguish separate colors, and in tests in comparison of colors red and green are used in other proportions.
  3. People with the so-called dihromatic (two-color) sight can describe all the colors they see, only with the help of two pure (basic) colors.
  4. In addition, there is a violation of the stick machine - people with such a deviation disrupted the ability to quickly adapt in the dark, with the colors they distinguish normally.

Examination of the perception of colors

The ability of the eyes to recognize one or another color can be determined by passing special tests. The most widespread polygromatic tables of Rabkin have been obtained.

Each of the 27 tables (so many of them in the set) are stained multicolored points of equal brightness, forming figures or geometric shapes. Those who are disturbed by the perception of colors, see on the table a uniform pattern, people with normal eyesight distinguish figures or figures and can call them.

The ophthalmologist determines whether there is a test violation of the perception of colors, depending on which characters the color does not consider. For guessing each combination of numbers or figures is given no more than 10 seconds. The test is carried out at the normal state of health of the tested and with fairly bright light.

Also in the set is a plate with numbers that should be seen by all people regardless of the peculiarities of color perception. With its help detect simulators, for example, with the prize in the army.



Verifying vision perception of colors

Category Of Medical Issues: Diseases

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