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An eyesight test using rows of letters printed in successively decreasing sizes (the Snellen scale) of which patients are asked to read as many as they can.
- ‘The Snellen scale tests distance visual acuity (distance vision) and is only one of the tests done to assess eyesight.’
- ‘The values represented here are estimates of how the child would have scored on the Snellen scale.’
- ‘Failing the department's Snellen test is indicative of generally poor visual ability, especially among 70 + year old drivers.’
- ‘The Snellen test for visual acuity is the test most commonly used and is based on distance vision.’
- ‘As with the Snellen test, each eye is tested separately and then together, with and without corrective lenses.’
Mid 19th century: named after Hermann Snellen (1834–1908), Dutch ophthalmologist.
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The definitions of ‘buddy’ and ‘bro’ in the OED have recently been revised. We explore their history and increase in popularity.