FIELD: ophthalmology.
SUBSTANCE: invention refers to medicine, namely to ophthalmology. Optotype for studying visual acuity is a ring. Optotype for investigating visual acuity has ring rupture in the form of circle, diameter of which relates to outer ring diameter as 1:5, and ring thickness relates to diameter of rupture in the form of circle 1:1.
EFFECT: using the given invention will make it possible to increase effectiveness and objectiveness of measurement of visual acuity.
1 cl, 2 dwg
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