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Home-made bi-chromatic test
OPTOMETRIC INSTRUMENTS
bi-chromatic test
Mitchell, David W.A.
Europe: United Kingdom, England
Mid 20th c.
plastic film; paper; sellotape
overall: 235 x 65 mm
2007.298
OPTOMETRIC INSTRUMENTS
bi-chromatic test
Mitchell, David W.A.
Europe: United Kingdom, England
Mid 20th c.
plastic film; paper; sellotape
overall: 235 x 65 mm
Plastic card bearing red and green horizontal strips with two black circles formed by paper cut-out and hollow centre 'Varilux' stickers.
2007.298
Bequest of Mr D. W. A. Mitchell FCOptom, 2007