It is intended for definition of a vizus and selection of a corrective spectacles by method of subjective test.
It is applied in ophthalmologic departments of clinics and hospitals, policlinics, in optical salons and shops of optics at selection of points optometrist.
Technical characteristics: Device design.
Three light - reflective mirrors.
Central position of a reflector.
On the main wall of the body tables of test signs - Golovin's tests - Sivtseva become stronger. They consist of two half one of which contains ranks of lines with printing letters of the Russian alphabet, and another - with Landolt's rings. Against each row in tables visual acuity is noted (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 distance from investigated in 5 m.
At children apply tables with tests in the form of pictures which sizes correspond to a certain visual acuity to determination of visual acuity.
Light source: the cold light lamp, 220 volts, with an electric power of 8 W that corresponds to 40 watts of a filament lamp, provides uniform illumination of tables not of 700 LX, sufficient on intensity.
Installation of the device Company: it has to be suspended on a wall so that the bottom edge of the body was at the height of 1,2 m from a floor and is located at distance of 5 meters from investigated.
Overall dimensions, mm. : 650х480х100.
Weight: no more than 7.5 Kg.