[Otical efficiency factor of a device for the controlled presentation of visual tests].
D004526:Efficiency; D008433:Mathematics; D055095:Optics and Photonics; D014787:Vision Tests / Q000295:instrumentation*
Opticheskiĭ KPD ustroĭstva dlia dozirovannogo pred'iavleniia zritel'nykh testov.