Rabkin polychromatic tables to check color vision

Color vision

For color vision answer light-sensitive receptor cells of the retina – cones. There are 3 types of cones, the spectral sensitivity maxima which occur in blue, green and red portions of the spectrum. By matching types of cones the three primary colors people recognize thousands of colors and shades. With the simultaneous excitation of the 3 types of receptors, the feeling of white color.   

Violation of color perception

If the violation or the weakening of the perception of one of the 3 primary colors, the person ceases to perceive any color. Disorder of perception of red is called Protanopia, a green – deuteranopia, blue – tritanopia. Disorders of color perception can be congenital or acquired. Rare congenital disorders of the perception of blue colors and a steam room, or complete color blindness. Most people can't distinguish red from green, because these colors are perceived as gray.  Is a disorder of color vision is called color blindness. It is a genetic disease, more common in males. For the diagnosis of disorders of color perception ophthalmologists use polychromatic Tables Rabkin.

What are the Rabkin polychromatic tables

Table consist of multi-colored circles, positioned in a certain way, that among them are determined by the outlines of figures or geometric shapes. For violation of color perception the patient sees the hidden numbers, invisible to healthy people. The tables address the common types of disorders of color vision that allows you to accurately set it congenital or acquired pathology.  Research can be carried out for adults and children 2 years and above.

Methodology of the study of color perception

• · the Subject is seated so that the light source was behind.
• · Table vertically at eye level, at a distance of 1 meter from the subject.
• For consideration in one table are no more than 10 seconds.
• · If the investigated wears glasses, the test he must pass in glasses.
• · To determine congenital abnormalities studied is asked to consider table two eyes at the same time, and to identify acquired defects study carried out alternately left and right eye.
• · Children are invited to circle the tassel is a sign that they see on the table.

Evaluation studies

1. Normal color vision (trichromacy) - if correctly named 27 tables main series.
2. Abnormal color sensation – if it isn't named from 1 – 12 tables.
3. Impaired perception of the same color (dichromate) improperly called 12 tables and more.

The Options table read:

• Right
• Insecure
• Typical incorrect
• Irregular atypical
• Not readable

There are 3 tables that can be read only by persons with acquired pathology.