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polarising filters
OPTOMETRIC INSTRUMENTS
accessory
Europe: United Kingdom, England
Mid 20th c.
metal; plastic
lens width: 40 mm
2005.381
OPTOMETRIC INSTRUMENTS
accessory
Europe: United Kingdom, England
Mid 20th c.
metal; plastic
lens width: 40 mm
Polaroid test. Pair of rectangular plastic dark-tinted lenses at a fixed p.d. mounted on metal bar designed to swivel in front of a trial frame.
2005.381
Gift of Mr Philip Freeman FCOptom, 2005