The scotometer was introduced in the first decade of the last century by Sir Richard Cruise, an eminent British ophthalmologist, who, among his other honors was eye doctor to George V and Queen Mary from 1918 to 1936. Scotometers are used for detecting blind spots in the visual field. Dixey is a 200-year-old London optical firm that now only sells spectacles but early in the last century they manufactured instruments as well. The scotometer is not ivory but rather
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