JOHN GREIM / SCIENCE PHOTO LIBRARY JOHN GREIM / SCIENCE PHOTO LIBRARY
Optician giving a patient an eye test using a refracting head. By turning the knobs on the front, different lenses can be selected so that the correct prescription may be found. The patient is looking through the lenses at a letter chart on the wall opposite. The correct prescription is found through a dialogue with the optician as to whether an image improves or degrades as different lenses are selected. This system has replaced the traditional method of testing with single lenses in trial frames.
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