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Four pads of pseudoisochromatic plates record sheets (second edition) by American Optical Company

1957

'Colour Test 53': wooden box with sliding coloured 'windows' and rotating dial

1945-1965
'Colour Test 55': black, wooden box with 3 coloured cards, crudely made, perhaps for testing for differences in binocular sensitivity to colour, 1940-1955. (BPS Inv. No. 0153)

'Colour Test 55': black

1940-1955
Colour matching test, homemade, with case and extra yellow discs. (BPS Inv. No. 0078.)

Colour matching test

A test for defective colour vision, electromechanical counter in 'home-made' wooden box, 1955-1975. (BPS Inv. No. 0073)

A test for defective colour vision

1955-1975