The REICHERT SightChek™ Digital Phoroptor® is a computerized vision testing instrument that optometrists and ophthalmologists use to measure a patient's refractive error and determine the correct prescription for glasses or contact lenses. It replaces the traditional manual phoropter, which uses a series of lenses that the doctor manually adjusts to determine the patient's prescription. https://www.foresightintl.com/product/reichert-sightchek-digital-phoroptor/