ANNA WRIGHT / SCIENCE PHOTO LIBRARY ANNA WRIGHT / SCIENCE PHOTO LIBRARY
Eye test. Artwork of folded spectacles on an eye test chart. The chart is used to measure how well a person can see. Spectacles (containing lenses to correct vision defects) may be required if the eye chart letters cannot be seen clearly. Typical eye disorders are long-sightedness (hypermetropia) and short-sightedness (myopia).
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