Snellen's test type for distance, card, British, early 20th century
Located at the back of this display is a chart of letters used to test a person’s sight at various distances. With good vision, the patient should be able to read the letters at a distance of six metres.
The chart was developed in the 1850s by Hermann Snellen (1834-1908), a Dutch ophthalmologist, and is still used today. The letters, from largest to smallest, are all a precise shape and size. The board is shown here in a display of sight testing in the 1930s.
- Object Number:
overall (lying flat): 23 mm x 317 mm x 564 mm, 0.46 kg
- snellen test types
- Spread Eagle Antiques
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