Test type to test eyesight, England, 1920-1960

Made:
1920-1960 in England
maker:
Unknown

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Test-types with rear illumination, for testing visual acuity, English, probably c.1950

Back lit for a clearer view, this display is a chart of letters used by an optician to test a person’s sight at various distances. Such charts are perhaps the most iconic objects in sight testing. A patient with good vision should be able to read the letters at a distance of six metres. The original sight charts were developed in the 1850s by Dutch ophthalmologist Hermann Snellen (1834-1908). The letters, from largest to smallest, are all a precise shape and size. Such charts are still commonly used.

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Details

Category:
Ophthalmology
Object Number:
A627002
Materials:
brass, copper, glass, perspex, rubber, steel, wood
type:
snellen test types
status:
Loan: Wellcome Trust

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