Frenzel glasses

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Frenzel glasses, the cylindrical part contains the batteries to power the light source in the glasses.
The Frenzel glasses, also called nystagmus glasses according to Frenzel, are used to detect nystagmus. Shown with cable for external power supply.

The Frenzel glasses (also: nystagmus glasses after Frenzel ), named after the Göttingen otologist Hermann Frenzel (1895–1967), are fully enclosed luminous glasses with magnifying plus lenses of at least 15.00 diopters . It is used as an examination instrument in the vestibular examination in order to be able to assess the involuntary eye movements of a provoked or spontaneous nystagmus in a subject . The highly refractive lenses enable precise observation of the eye movements, while illumination shining in from below or from the side switches off any possibility of fixation for the person being examined due to the resulting glare .

literature

  • Herbert Kaufmann (Ed.): Strabismus. With the collaboration of Wilfried de Decker et al. Enke, Stuttgart 1986, ISBN 3-432-95391-7 .