The influence of moistening fluids on the measuring results of applanations-tonometry (author's transl).

The applanation tonometry is influenced by several factors not considered by the law of Imbert-Fick. For instance, a change in the conditions of moistening the cornea may falsify the result of measuring. This has been proved clinically and experimentally with Polyvinylpyrrolidon. The fault in measuring is larger with applanation tonometers producing variable applanation areas along with constant pressure than with those flattening small invariable corneal area. Aside of the difficulty of exact measurement of the applanation areas the latter tonometers are superior to the former ones because of this reason, too.