It is intended for determination of vizusa and modifying selection points using the method of subjective tests. Used in ophthalmological offices, clinics and hospitals, clinics, optical salons and shops of optics in the selection of points optometristami.
On the main wall of reinforced table test marks tests Golovina - Sivtsev table. They consist of two halves, one of which contains a series of lines with block letters of the Russian alphabet, and another with Landolt rings. Against each row in the tables marked with Visual acuity (0.1; 0.2, 0.3; 0.4; 0.5; 0.6; 0.7; 0.8, 0.9; 1.0; 1.5 and 2.0), corresponding to the distance from the investigated in 5 m.
Light source - fluorescent lamp, 220 volt, 8 Watt electric power, which corresponds to 40 watt incandescent provides sufficient intensity uniform illumination tables 700 LUX.
Device installation Company: it must be hung on the wall so that the lower edge of the hull was at a height of 1.2 m above the floor and is located at a distance of 5 meters from the investigated.