[MODIFICATION OF LANDOLT'S OPTOTYPE WITH A MARKED RESTRICTION OF THE CONTRAST KEY].
D006801:Humans; D009885:Ophthalmology; D009988:Orthoptics; D014787:Vision Tests
OPHTHALMOLOGY; ORTHOPTICS; VISION TESTS
N'AVRH MODIFIK'ACIE LANDOLTOVHO OPTOTYPU S V'YRAZN'YM OBMEDZEN'IM KONTRASTN'EHO KL''U CA.