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. He is asked to read the wall chart (at top) with one and then the other eye. The lenses are 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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