The Sivtsev table is a standard set of printed characters for determining human visual acuity. Sivtsev's table consists of a combination of seven different letters of different sizes, but equal in width and height. According to the conventionally accepted norm, an eye with 100% vision (V=1.0) is able to distinguish two distant points with an angular resolution of 1 minute (or 1/60 of a degree).
The proposed Sivtsev table contains a set of printed characters for determining visual acuity in the range of 0.1 - 5.0 from a distance of 5 m, and the first 10 rows (with V = 0.1-1.0) differ in steps of 0.1, the next two rows (V = 1.5-2.0) - in 0.5, and three additional rows (V=3.0-5.0) in 1.0.
The table also contains two additional columns: on the left - " D =..." (the distance in meters from which a given sign is seen by a person with 100% vision), on the right - " V =..." (visual acuity, if given a number of signs are read from 5 m). The V values given in the right column of the table correspond to the visual acuity examined from a distance of 5 m.
When determining visual acuity, the table should be illuminated with one incandescent lamp or two fluorescent lamps so that the illumination is 700 lux. The light from the lamp(s) should be directed only at the table and not hit the person's face.
