The Ophthalmetron is an electro-optical instrument designed to determine the refractive state of an eye. The output is in the form of a graph which gives the refractive state for each meridian. The principle upon which its operation is based is described, and illustrations of its components and graphical output are shown.
No takes yet. Share an insight, caveat, or question.
Knoll et al. (1972) studied this question.