A table of silhouette patterns meeting the requirements of ISO standard is developed in Russia. The aim of this work was to assess by ISO method the correspondence of visual acuity evaluated by the pattern table to visual acuity evaluated by Landolt rings and select the patterns the recognition of which is most of all similar to recognition of Landolt's rings. Visual acuity was examined by the ISO method in 10 subjects with visual acuity of 1.0. Visual acuity assessed by patterns corresponded to that assessed by Landolt's rings if the examinee was acquainted with all tests. Recognition of patterns was assessed in 22 children aged 3.5-5.5 years. Patterns which were identified in less than 50% cases were excluded from the tables. The proposed table can be used in practical ophthalmology, because the results of visometry using this table are compatible with the results of examination by means of Landolt's rings.