ADAM HART-DAVIS / SCIENCE PHOTO LIBRARY ADAM HART-DAVIS / SCIENCE PHOTO LIBRARY
Eye test. Ophthalmology test frames fitted to a young boy for assessing his vision. Test frames are used to hold lenses to correct vision. The patient is asked to read a wall chart. When the correct strength of lens for each eye has been determined to read the wall chart, lenses are ground to make glasses for the patient.
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