DIRECT OPHTHALMOSCOPE Inquire Additional Description Illumination form: big spot, small spot red free, central net, slit, half spot Diopter Compensatino0 ±1 ±2±3 ±4 ±5 ±6 ±8 ±10 ±12 ±16 ±20±25+40 (D) Illumination Bulb:3.5v/0.45A Power supply:AC220v