Ishihara series of 14 plates: '9' seen in plate 13 with the '6' unclear
ishihara series of 14 plates: '9' seen in plate 13 with the '6' unclear
Ishihara series of 14 plates: '9' seen in plate 13 with the '6' unclear
ishihara series of 14 plates: '9' seen in plate 13 with the '6' unclear