ランドルト環（視力検査）：黒
Schlüsselwörter
mark,
flat,
black,
monochrome,
eye,
check-up,
inspection,
right,
illustration,
hospital,
medical care,
look,
contact,
eye doctor,
icon,
design,
vision,
flair,
symbol,
acknowledgment,
glasses,
marode,
exam,
eye,
patient,
school,
measurement,
clinic,
diagnostic,
surgery,
doctor,
dispensary
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