Upper level: b210 Seeing functions
Seeing functions of sensing form and contour, both binocular and monocular, for both distant and near vision.
Lower livel:
b21000 Binocular acuity of distant vision
b21001 Monocular acuity of distant vision
b21002 Binocular acuity of near vision
b21003 Monocular acuity of near vision
b21008 Visual acuity functions, other specified
b21009 Visual acuity functions, unspecified
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