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Dr George Young's Threshold Test
OPTOMETRIC INSTRUMENTS
threshold test
John Weiss & Son Ltd
Europe: United Kingdom, England, London, W1
c.1954
cardboard
overall (each disk): 154 mm

Threshold test consisting of a set of ten discs with central holes. Five are black on one side with between one and five parallel white lines. Five are white with differently coloured partial concentric annular markings.


2001.88

Gift of Mr Nigel Austin, FBOA, FSMC, 2001



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2001.88.jpg

2001.88b.jpg

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