[Observations on the pH value of various artificial tears preparations].
BACKGROUND
The pH-values of artificial tears have not been examined up to now.


METHODS
The pH-values of 20 commercially available artificial tears were determined.


RESULTS
pH-values measured from 4.82 to 8.39. One sixth showed pH-values above physiological values.


CONCLUSIONS
A remarkable proportion of commercially available artificial tears deviate from the physiological range of the pH. It does not seem advisable to apply those in eyes with damaged anterior segments.
Universitäts-Augenklinik Mainz.
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D005858:Germany; D006801:Humans; D006863:Hydrogen-Ion Concentration; D009883:Ophthalmic Solutions / Q000009:adverse effects / Q000737:chemistry*; D012016:Reference Values; D013666:Tears / Q000737:chemistry
D009883:Ophthalmic Solutions
Beobachtungen über den pH-Wert verschiedener Tränenersatzmittel.