Nidek’s Speedy K Autorefractor / Keratometer has advanced engineering and unique technology that make the Speedy autorefractors the most accurate autorefractors available. It's acquisition of data optimizes measurements and reduces testing time. The medical Retro-Illumination mode allows the lens to be observed, and media opacities illuminated and identified. Readings are initiated the instant that alignment and focus is achieved and measurements are terminated automatically when complete. Measurements are taken in a fraction of a second.. Perfect for children and patients who require rapid measurement acquisition.