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Bi-chromatic flip test
OPTOMETRIC INSTRUMENTS
bi-chromatic test
Europe: United Kingdom
1950s?
metal; glass
overall: 165 x 75 mm; lens diameter: 36 mm

Bi-chromatic flip confirmation test consisting of two lenses (one red, one green) welded to each other and to the tip of a white metal handle.


2003.307

Gift of the Glasgow Eye Infirmary, 2003



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