Technical parameters of led eye chart light box 1. Light box size2.5-meter visual acuity meter light box dimensions: 660x280x28mm2.5m vision chart light box screen size: 580x200mmDouble side light source Screen brightness: ≥200cd / m²Border color: blackFrame material: aluminum alloy The four sides of the frame can be opened, change the panelRecording method: decimal record and 5 points recordPower cord length: 1.8 metersPower supply voltage: 220V50HZ