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Dunn's Complete Pocket Refraction Test
test chart
F. Davidson & Co.
Europe: United Kingdom, England, London
card; metal
overall (open): 575 mm x 175 mm

Folding test chart for domiciliary use, comprising eight panels, one with an astigmatic protractor scale and four rotating pointers bearing astigmatic blocks, the remaining seven panels bearing test types after Snellen at sizes descending from 80-15 feet (24-4.5 metres). On the reverse of these panels a series of near vision reading test types descending from 8-1 feet (-2.50 D to -0.50 D).


Gift of Mr David Randall, FCOptom, 2011

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