BSIP, MENDIL / SCIENCE PHOTO LIBRARY BSIP, MENDIL / SCIENCE PHOTO LIBRARY
Eye test. Boy wearing lens frames during an eye test. In the test, different lenses are placed in the frames, and he reads from a chart (not seen). When the patient reports correct vision, the lenses in the frames are used as templates to grind lenses for his glasses. Focusing disorders such as myopia (shortsightedness) are due to an incorrectly shaped eyeball. The lenses compensate for the shape, restoring normal vision.
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