22 februari 2010
Cover one eye
A Snellen chart, an eye chart used by eye care professionals and others to measure visual acuity. Snellen charts are named after the Dutch ophthalmologist Herman Snellen who developed the chart during 1862 (source: wikipedia).
This one is definately vintage, I bought it a few years ago in a great little shop up North.
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Oh how I'd love to find one of these charts - what a find!
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