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Barrier filter and opticians rule
OPTOMETRIC INSTRUMENTS
filter
Johnson & Johnson Medical Ltd; The Vision Care Institute
Europe: United Kingdom, England
2010
cardboard; plastic film
overall: 76 mm x 228 mm

Hand-held barrier filter made of white cardboard containing two apertures filled with a yellow Fluorescein and a red Lissamine filter. On one side an 8cm rule plus a 10-13mm diameter gauge. On the other side an 8cm rule and a 1-7.5mm gauge.


2011.50

Gift of Cardiff University, School of Optometry and Vision Sciences, 2011



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