Distometer

A change in vertex distance of eyeglasses compared to that of the trial lenses results in a change in the effective power of the eyeglasses. This becomes especially important when the eyeglass prescription is greater than a plus/minus four or five diopter correction. Measures distance from the patient’s cornea to the lens of glasses or trial lenses in a trial frame  Circular conversion calculator is included Durable metal construction Comes in a case