Current knowledge concerning the use of eardrops is discussed under clinical and pharmacological aspects. The role of topical ear drops as a possible cause of ototoxicity is reviewed. Although experimental data confirm the presence of ototoxicity due to topical ear drops, the clinical relevance still remains debatable. The fact that currently used ear drops may produce a sensorineural hearing loss should not be ignored.
Tuning fork tests have accompanied us from the beginning of otology. Various methods of striking have been used during the century and the efforts to attain standardisation appear to have been forgotten since audiology became available. But the use of tuning forks is very important. Some physical principles of the Weber- and Rinne-tuning fork test are described. Furthermore some hints in their interpretation are stressed. The necessary control of pure tone audiometry by tuning forks is pointed out. The essential need for tuning forks in daily clinical practice is emphasised by examples and the special advantages of tuning forks are detailed.
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