Welch Allyn 18240 Elite Streak Retinoscope ORIGINAL NEW (Head Only) Product Description Enhanced light output makes refractions easier than ever, by producing one of the sharpest, brightest and cleanest streaks available on the market. Discover unparalleled performance in a compact design with convenient, user-friendly features. 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 Sealed optics keep dust out and optics clean for a more effective exam Fits all Welch Allyn 3.5 V power sources