Edridge-Green Lantern

A type of Lantern used for color vision testing, developed in 1891 by Frederick William Edridge-Green (1863-1953). Although rejected by the intended user, the UK Board of Trade in favor of Holmgren’s Wool, this Lantern was eventually adopted by The UK and American Navies (Cole 1982).

Probably due to the creator’s longevity (surviving an additional 60 years past the original creation), the Edridge-Green Lantern is one of the Lantern with the longest production run, with the Lanterns produced until at least as late as 1993. It remains a current color vision standard in many countries, including India.

There is no empirical data to show the relative stringency of the Lantern. The notoriously arrogant Edridge-Green never clearly defined procedures or interpretation of results, and his validation steps were never shared, isntead stating that he “tested with it until he was certain of his diagnosis.” (ref)