TEK IMAGE / SCIENCE PHOTO LIBRARY TEK IMAGE / SCIENCE PHOTO LIBRARY
Eye test chart and frames. Ophthalmology test wall chart seen through a pair of test frames. The frames are used to hold lenses to correct vision. A patient is asked to read the letters on the wall chart with one and then the other eye. The lenses in the frames will be adjusted accordingly for reading the wall chart. When the correct strength of lens for each eye has been determined, lenses are ground to make glasses for the patient.
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