Landolt ring
noun
Lan·dolt ring
ˈlän-dōlt-ˌriŋ 
: one of a series of incomplete rings or circles used in some eye charts to determine visual discrimination or acuity
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“Landolt ring.” Merriam-Webster.com Medical Dictionary, Merriam-Webster, https://www.merriam-webster.com/medical/Landolt%20ring. Accessed 25 Dec. 2024.
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