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Frenzel goggles : ウィキペディア英語版 | Frenzel goggles
Frenzel goggles are a diagnostic tool used in ophthalmology for the medical evaluation of involuntary eye movement (nystagmus). They are named after Frenzel, a German physician.〔http://www.tchain.com/otoneurology/practice/frenzels.htm Frenzel goggles and related devices〕 ==Usage== The purpose of the goggles is to disable the patient's ability to visually fixate on an object while at the same time allowing the examiner to adequately visualize the eye. This is done by using high-powered (+20 diopters) magnifying glasses with an illumination system. With such a high-powered lens, it is unlikely that the patient can adequately focus and visually fixate on an object to suppress nystagmus.
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