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OXO Fixation Disparity Test
test chart
Freeman, Philip
Europe: United Kingdom
metal; plastic
overall: 154 x 181 mm

Home-made testing device consisting of thin metal sheet with gold-coloured front surface and silver back. X-shaped aperture filled with transparent grey film. Green dot and arrow. Red dot and arrow. Film secured with sticky tape.


Gift of Mr Philip Freeman, FCOptom, 2002

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