ˈsnelə̇n- noun
Usage: usually capitalized S
Etymology: after Herman Snellen died 1908 Dutch ophthalmologist
: a test for visual acuity presenting letters of graduated sizes to determine the smallest size that can be read at a standard distance
ˈsnelə̇n- noun
Usage: usually capitalized S
Etymology: after Herman Snellen died 1908 Dutch ophthalmologist
: a test for visual acuity presenting letters of graduated sizes to determine the smallest size that can be read at a standard distance
Webster's New International English Dictionary. Новый международный словарь английского языка Webster. 2012