MARK THOMAS / SCIENCE PHOTO LIBRARY MARK THOMAS / SCIENCE PHOTO LIBRARY
Eye examination. Optician using a phoropter to examine a woman's eyes. This device is used to measure the refractive error in the eyes and to determine an individual's lens prescription. A refractive error is an error in the focusing of light by the eye, which is one of the causes of a reduction in visual sharpness.
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