Autorefractometer
Autorefractometer
Instrument for measuring the refractive state of the eye. There are two main types of optometers: Subjective: Optometers rely upon the subject's judgment of sharpness or blurredness of a test object while Objective: Ones contain an optical system which determines the vergence of light reflected from the subject's retina. Electronic optometers in which all data appear digitally within...