Color vision
For color vision, the photosensitive retinal receptor cells, the cones, are responsible. There are 3 types of cones, the maximum spectral sensitivity of which falls on the blue, green and red parts of the spectrum. Due to the correspondence of the cone types to these three primary colors, a person recognizes thousands of colors and shades. With the simultaneous excitation of 3 types of receptors, there is a sensation of white.
Color Disorder
In case of violation or weakening of the perception of one of the 3 primary colors, a person ceases to perceive any color. Impaired perception of red is called protanopia, green - deuteranopia, blue - tritanopia. Color disturbances can be congenital or acquired. Congenital disturbances of perception of blue color and pair or full color blindness are rare. Most often, people cannot distinguish between red and green because perceive these colors as gray. This color vision disorder is called color blindness. This is a genetic disease that is more common in males. Opticians use polychromatic to diagnose color perception disorders. .
What are the polychromatic tables of Rabkin
Tables consist of multi-colored circles arranged in a certain way, so that outlines of numbers or geometric shapes are determined among them. In violation of color perception, the patient sees hidden numbers that are invisible to healthy people. The tables take into account the generally accepted types of color vision disorders, which allows you to accurately establish its congenital or acquired pathology. The study can be carried out for adults and children from 2 years.
Color Sensing Research Technique
- 路 The test subject is seated so that the light source is behind him.
- 路 Tables are arranged vertically at eye level, at a distance of 1 meter from the subject.
- For consideration of one table no more than 10 seconds are given.
- 路 If the examinee wears glasses, then the test should take place with glasses.
- 路 To determine the congenital pathology of the subject, they are asked to look at the tables with two eyes at the same time, and to identify acquired disorders, the study is carried out alternately with the right and left eye.
- 路 Children are invited to circle with a brush the sign that they see on the table.
Assessment of the results of the study
- Normal color vision (trichromasia) - if 27 tables of the main series are correctly named.
- Abnormal color perception - if incorrectly named from 1 - 12 tables.
- Impaired perception of one color (dichromasia) - 12 tables or more are incorrectly named.
Options for reading tables:
- right
- uncertain
- wrong typical
- abnormal atypical
- not read
There are 3 tables that only persons with acquired pathology can read.