LEWIS HOUGHTON / SCIENCE PHOTO LIBRARY LEWIS HOUGHTON / SCIENCE PHOTO LIBRARY
Eyesight test chart. Lightbox with rows of letters of varying size. The letters are mirror images, designed to be read in a mirror. This allows a mirror to be placed at the required distance, rather than moving the lightbox itself. The patient is asked to read the letters from a particular row, allowing an optician or ophthalmologist to assess the patient's eyesight. Photographed at the Princess Alexandra Eye Pavilion, Edinburgh, Scotland.
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