Use of Frenzel glasses in diagnosis of lesions of the vestibular system

B. Cohen

Research output: Contribution to journalArticlepeer-review

3 Scopus citations


There are a number of distinct advantages of Frenzel glass testing. First the doctor gains the experience of directly observing the eyes. If the patient has facial grimacing or rapid blinking, steps can be taken to control this during Frenzel glass testing, whereas during EOG the record is often obscured by artifacts and may not be readable. Secondly, if one suspects that nystagmus is present in a particular position, it is easy to repeat that part of the test several times and come to an immediate conclusion, something which is not done by a technician during an EOG. Thirdly, as Kornhuber has pointed out in his excellent review of nystagmus, spontaneous and positional nystagmus is present in up to 20% of normal individuals when tested with EOG, whereas it is not commonly present in normals wearing Frenzel glasses. Apparently, the presence of the lights which illuminate the globes lowers the sensitivity of the test so that nystagmus is present only when there are lesions of the central nervous system or peripheral vestibular system. Finally, without a great deal of apparatus and with relatively simple test techniques, it is often possible to make a positive diagnosis at the time of examination, facilitating workup and treatment.

Original languageEnglish
Pages (from-to)1-10
Number of pages10
Issue number2
StatePublished - 1976
Externally publishedYes


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