TY - RPRT TI - Normal human tear pH by direct measurement. AU - M B Abelson AU - I J Udell AU - J H Weston PY - 1981 DO - 10.1001/archopht.1981.03930010303017 UR - https://pubmed.ncbi.nlm.nih.gov/7469869/ ID - 7469869 ER -