Rabkin's polychromatic tables for testing color vision

Color vision

For color vision, the photosensitive receptor cells of the retina - cones - respond. There are 3 kinds of cones, the maximum spectral sensitivity of which falls on the blue, green and red regions of the spectrum. Due to the correspondence of the types of cones to these three basic colors, a person recognizes thousands of colors and shades. With the simultaneous excitation of 3 types of receptors, there is a feeling of white.

Disturbance of color perception

If you violate or weaken the perception of one of the three primary colors, a person ceases to perceive any color. Violation of the perception of red is called protanopia, green - deuteranopia, blue - tritanopia. Disorders of color perception can be congenital or acquired. Rarely are there congenital disorders of blue perception and a pair or full color blindness. More often than not, people can not distinguish between red and green; Perceive these colors as gray. Such a disorder of color vision is called color blindness. This is a genetic disease, more common in males. To diagnose color disorders oculists use polychromatic tables of Rubkin.

What are the polychromatic tables of Rabkin

Tables consist of multi-colored circles, arranged in a certain way, that among them the outlines of figures or geometric figures are determined. If the color perception is impaired, the patient sees hidden numbers that are invisible to healthy people. The tables take into account the generally accepted types of color vision disorder, which allows one to pinpoint its congenital or acquired pathology. The study can be conducted for adults and children from 2 years.

Method for the study of color perception

• The examinee is seated so that the light source is behind his back.
• · The tables are located vertically at eye level, at a distance of 1 meter from the subject.
• For a single table, no more than 10 seconds are given.
• • If the researcher wears glasses, then the test must be passed in glasses.
• · To determine the congenital pathology of the examinee, one is asked to view the tables with two eyes simultaneously, and to investigate the acquired disorders, the study is performed alternately with the right and left eye.
• · Children are offered to circle the sign that they see on the table.

Evaluation of research results

1. Normal color vision (trichromasia) - if properly named 27 tables of the main series.
2. Abnormal color perception - if incorrectly named from 1 to 12 tables.
3. Violation of the perception of one color (dichromasia) - 12 tables or more are incorrectly named.

Variants of reading tables:

• Correct
• Insecure
• Wrong typical
• Abnormal atypical
• Not readable

There are 3 tables that only people with acquired pathology can read.