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Wall chart printed on one side with pattern of radiating lines for assessing astigmatism, printed by Cowan and Sons, English, 1880-1940

Wall chart printed on one side with pattern of radiating lines for assessing astigmatism

1880-1940
Astigmatic fan chart, with sight testing card on back, cardboard, by Curry & Paxton, 195 Great Portland Street, London, England, 1890-1910.

Astigmatic fan chart

1890-1910
Card printed on one side with pattern of radiating lines for assessing astigmatism, printed by Thomas Armstrong and Brother of Manchester, 1880-1940

Card printed on one side with pattern of radiating lines for assessing astigmatism

1880-1940
Astigmatic fan, cardboard, English, 1851-1950

Astigmatic fan

1851-1950
Wall chart printed on one side with pattern of radiating lines for assessing astigmatism, probably English 1851-1930

Wall chart printed on one side with pattern of radiating lines for assessing astigmatism

1851-1930