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The takeaway Frenzel goggles: A Fresnel-based device
OBJECTIVE: To develop and evaluate new thin and light glasses for the examination of patients with nystagmus and to compare them with Frenzel goggles. METHODS: First, we designed new examination glasses: a Fresnel-based device with a short focal length that is not as heavy or bulky as Frenzel goggle...
Autores principales: | , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
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Lippincott Williams & Wilkins
2014
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4180483/ https://www.ncbi.nlm.nih.gov/pubmed/25165387 http://dx.doi.org/10.1212/WNL.0000000000000838 |
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author | Strupp, Michael Fischer, Carolin Hanß, Lena Bayer, Otmar |
author_facet | Strupp, Michael Fischer, Carolin Hanß, Lena Bayer, Otmar |
author_sort | Strupp, Michael |
collection | PubMed |
description | OBJECTIVE: To develop and evaluate new thin and light glasses for the examination of patients with nystagmus and to compare them with Frenzel goggles. METHODS: First, we designed new examination glasses: a Fresnel-based device with a short focal length that is not as heavy or bulky as Frenzel goggles. Second, visual-fixation suppression of postrotatory nystagmus with Frenzel goggles and the Fresnel-based device, the latter with 2 different magnifications (2- and 4-fold), was compared in 13 healthy subjects. Third, the intensity of the peripheral vestibular spontaneous nystagmus—in 6 patients with acute vestibular neuritis—with the Frenzel goggles and the Fresnel-based device with the 4-fold magnification was compared. Fourth, the visibility and clinical applicability were evaluated. RESULTS: The Fresnel-based device weighs 6 g (dimensions 12 × 8 × 0.3 cm). There was no significant difference in the intensity of postrotatory nystagmus between the Fresnel-based device with 4-fold magnification (37.3 ± 17.9°/s) and the Frenzel goggles (39.0 ± 18.3°/s). There was also no significant difference between the intensity of peripheral vestibular spontaneous nystagmus in the patients with acute vestibular neuritis. The Fresnel-based device can be easily applied. CONCLUSION: For suppression of nystagmus, the new Fresnel-based device or so-called M glasses is not inferior to Frenzel goggles. Doctors can carry it in their pocket, it is inexpensive, and easy to handle and to fix to the patient's nose so that it can be used in daily practice for the bedside examination. CLASSIFICATION OF EVIDENCE: This study provides Class III evidence that, in subjects with nystagmus, a Fresnel-based device identifies a similar intensity of nystagmus as that identified by Frenzel goggles. |
format | Online Article Text |
id | pubmed-4180483 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2014 |
publisher | Lippincott Williams & Wilkins |
record_format | MEDLINE/PubMed |
spelling | pubmed-41804832014-10-02 The takeaway Frenzel goggles: A Fresnel-based device Strupp, Michael Fischer, Carolin Hanß, Lena Bayer, Otmar Neurology Article OBJECTIVE: To develop and evaluate new thin and light glasses for the examination of patients with nystagmus and to compare them with Frenzel goggles. METHODS: First, we designed new examination glasses: a Fresnel-based device with a short focal length that is not as heavy or bulky as Frenzel goggles. Second, visual-fixation suppression of postrotatory nystagmus with Frenzel goggles and the Fresnel-based device, the latter with 2 different magnifications (2- and 4-fold), was compared in 13 healthy subjects. Third, the intensity of the peripheral vestibular spontaneous nystagmus—in 6 patients with acute vestibular neuritis—with the Frenzel goggles and the Fresnel-based device with the 4-fold magnification was compared. Fourth, the visibility and clinical applicability were evaluated. RESULTS: The Fresnel-based device weighs 6 g (dimensions 12 × 8 × 0.3 cm). There was no significant difference in the intensity of postrotatory nystagmus between the Fresnel-based device with 4-fold magnification (37.3 ± 17.9°/s) and the Frenzel goggles (39.0 ± 18.3°/s). There was also no significant difference between the intensity of peripheral vestibular spontaneous nystagmus in the patients with acute vestibular neuritis. The Fresnel-based device can be easily applied. CONCLUSION: For suppression of nystagmus, the new Fresnel-based device or so-called M glasses is not inferior to Frenzel goggles. Doctors can carry it in their pocket, it is inexpensive, and easy to handle and to fix to the patient's nose so that it can be used in daily practice for the bedside examination. CLASSIFICATION OF EVIDENCE: This study provides Class III evidence that, in subjects with nystagmus, a Fresnel-based device identifies a similar intensity of nystagmus as that identified by Frenzel goggles. Lippincott Williams & Wilkins 2014-09-30 /pmc/articles/PMC4180483/ /pubmed/25165387 http://dx.doi.org/10.1212/WNL.0000000000000838 Text en © 2014 American Academy of Neurology This is an open access article distributed under the terms of the Creative Commons Attribution-Noncommercial No Derivative 3.0 License, which permits downloading and sharing the work provided it is properly cited. The work cannot be changed in any way or used commercially. |
spellingShingle | Article Strupp, Michael Fischer, Carolin Hanß, Lena Bayer, Otmar The takeaway Frenzel goggles: A Fresnel-based device |
title | The takeaway Frenzel goggles: A Fresnel-based device |
title_full | The takeaway Frenzel goggles: A Fresnel-based device |
title_fullStr | The takeaway Frenzel goggles: A Fresnel-based device |
title_full_unstemmed | The takeaway Frenzel goggles: A Fresnel-based device |
title_short | The takeaway Frenzel goggles: A Fresnel-based device |
title_sort | takeaway frenzel goggles: a fresnel-based device |
topic | Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4180483/ https://www.ncbi.nlm.nih.gov/pubmed/25165387 http://dx.doi.org/10.1212/WNL.0000000000000838 |
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