000 00256 a2200109 4500
080 _a617.75
_bS 671 O
245 1 _aOptotypi ad visum determinandum
_cby H. Snellen
260 _c1911
650 _aVision Disorders
100 1 _aSnellen, H.
_d
901 _a14875
999 _c39312
_d39312