INS-11091-4-O | 3.5V Streak Retinoscope LED OPTI+

3.5V Streak Retinoscope LED model INS-11091-4-O Makes refractions easier than ever by producing one of the brightest, sharpest, and cleanest streaks available. Provides 2.8X LED Superior streak quality enables easier and quicker refractions – even in patients with small pupils Crossed linear polarizing filter eliminates bothersome glare from trial lenses, helping you perform a more precise exam External focusing sleeve improves comfort and maneuverability Sealed optics keep the lenses cleaner for more effective exams Fits all Welch Allyn 3.5 V power sources Optical Specifications Rotation = 190° Distance from the device to which the real imagea of the lamp filament is adjustable = 450 mm Distance from the device to which the virtual imagea of the lamp filament is adjustable = 450 mm Length of streak imageb = 30 mm Width of streak imageb = 1.5 mm Deviation from linearity of the streak image at the focusb. = 2 mm Rotation decentring of centre of streak imageb. = 10 mm a All distances are measured from the light exit of the device b When focus at 500 mm Electrical Specifications Bulb 3.5 V 2.7 W Operation mode Intermittent, on-time should not exceed 2 min with off-time not less than 5 min Environment Requirements Operation Environment Temperature +10 C - +35 C Relative Humidity 30% - 75% Atmospheric Pressure 700 hPa - 1060 hPa Shipping Common Conveyance Storage Environment Temperature -40 C - +55 C Relative Humidity 10% - 90% Atmospheric Pressure 500 hPa - 1060 hPa