Explicação, anotação:For objective determination of eye refraction by the method of shadow ïðîáû-ñêèàñêîïèè.
Descrição porminorizada da marca:Composition: 1ëèíåéêà with positive lens and movable frame, 1ëèíåéêà with negative. lens and movable frame. the measurement limits of refractions with gradation 0. 5 äïòð: from +9 to - 9 äïòð. measurement limits of refraction with gradation 1 äïòð: from +10 to +19 äïòð, from - 10 to - 19 äïòð. length: 350 MM. width: 40 MM . mass of each ruler: 0. 2 kg. |