Enhanced light output makes refractions easier than ever, by producing one of the sharpest, brightest and cleanest streaks available on the market. Features : - 2.8X the brightness and superior streak quality versus standard retinoscopes - Superior streak quality enables easier and quicker refractions - Optional crossed-linear polarizing filter removes 99% of glare from trial lenses - External focusing sleeve offers continuous rotation - Fits all Welch Allyn 3.5 V power cources - Sealed optics keep dust out and optics clean for a more effective exam Welch Allyn Streak Retinoscope