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Contrast Sensitivity Screener
TEST CHARTS
contrast test; rule
Vistech Consultants Inc.; Merck Sharp & Dohme Limited
North America: USA
Early 21st c.
plastic
overall: 88 mm x 171 mm
2021.813
TEST CHARTS
contrast test; rule
Vistech Consultants Inc.; Merck Sharp & Dohme Limited
North America: USA
Early 21st c.
plastic
overall: 88 mm x 171 mm
Small laminated plastic chart for screening contrast sensitivity using patches. For handheld use at a distance of 16 inches from the eye. Printed in black and green on one side of the card with, on the other side, the 'answers' and possible interpretations, sandwiched between imperial and metric scales and a promotion for Timoptic sterile ophthalmic solution.
2021.813
Gift of Mr John Dixon Salt FCOptom, 2020