Holmgren yarn test
noun
Holm·gren yarn test
ˈhōm-grən-ˈyärn-, ˈhōlm- 
: a method of testing color vision by the use of colored wool yarns
called also Holmgren test, Holmgren wool test
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“Holmgren yarn test.” Merriam-Webster.com Medical Dictionary, Merriam-Webster, https://www.merriam-webster.com/medical/Holmgren%20yarn%20test. Accessed 6 Feb. 2025.
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