Now get legendary Phoroptor operation and construction with lighted dials to make it easier and more efficient to perform refractions in the darkened setting of the exam room. Put away your pen light and leave the lights off throughout the entire process. The Illuminated Phoroptor features lighted sphere, cylinder power and cylinder axis scales that are easier than ever to see. The Illuminated Phoroptor utilizes cool-running, energy efficient LEDs that light only what you need to see without affecting the darkened refracting environment. The patented LED design results in maintenance-free illumination without the need to ever change a bulb.