Nystagmus

Tarnutzer, Alexander A.; Straumann, Dominik

doi:10.1097/wco.0000000000000517

Cited by 25 publications

(19 citation statements)

References 76 publications

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“…DBN is a frequent form of acquired nystagmus and manifests with oscillopsia, postural instability, and cerebellar gait disruption. [1] Additional ocular motor signs such as gaze-evoked nystagmus, deficient smooth pursuit eye movement, and strabismus are often associated. [31213] In the majority of patients DBN is caused by bilaterally impaired function of the cerebellar floccular lobe or its connections to the midbrain.…”

Section: Discussionmentioning

confidence: 99%

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Clinical and electrophysiological results of eye muscle surgery in 17 patients with downbeat nystagmus

Hertle

Ahmad

2019

Indian J Ophthalmol

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Purpose:To test the hypothesis that eye muscle surgery in treatment of patients with acquired downbeat nystagmus results in improvement measures of visual and ocular motor function.Methods:This is a prospective, interventional case series analysis of clinical and electrophyisological data before and after eye muscle surgery in 17 patients with acquired downbeat nystagmus who did not respond to medical treatments. Outcome measures included: 1) routine demography and clinical characteristics, 2) subjective oscillopsia (SO), 3) binocular best-corrected visual acuity in the null position (BVA), 3) primary position strabismic deviation (SD), 5) anomalous head posture (AHP), 6) contrast sensitivity function (CS), and 7) nystagmus slow phase velocity (SPV). All patients were followed at least 12 months. Parametric and non-parametric statistical analysis of outcome measure data above pre- and post-treatment were perfomed using standard software on grouped data using computerized software.Results:Patients’ age ranged from 5 to 85 years (average 27 years). About 59% were male. Follow up ranged from 1–10 years (average 2.0 years). Around 70% had an associated central nervous systemic diagnosis, 100% had an AHP, oscillopsia and decreased CS, 53% had other eye disease, and 59% had strabismus. There were no complications from surgery. There were signficant post-treatment improvements in mean/median group BVA, SO, SD, AHP, CS, and SPV.Conclusion:This study supports the hypothesis that eye muscle surgery as treatments for patients with acquired downbeat nystagmus can result in improvements in multiple aspects of ocular motor and visual functions.

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Section: Discussionmentioning

confidence: 99%

“…Downbeat nystagmus (DBN) is one of the most frequent forms of acquired nystagmus. [1] Affected patients suffer from postural imbalance, cerebellar ataxia, oscillopsia, and reduced visual acuity. [2] Most patients have associated cerebellar or neurodegenerative disorders.…”

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confidence: 99%

Clinical and electrophysiological results of eye muscle surgery in 17 patients with downbeat nystagmus

Hertle

Ahmad

2019

Indian J Ophthalmol

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“…Caloric testing, usually as part of a videonystagmography (VNG) test battery, has been extensively researched ( 48 ) and is a mainstay of testing horizontal, semicircular canal function. VNG can also inform regarding the status of central vestibular and oculo-motor pathways, making identification of lesions therein possible ( 49 ). VNG offers advantages and disadvantages when applied in an older population.…”

Section: Specialized Equipment-based Assessment Of Vestibular Function In Older Adult CI Candidatesmentioning

confidence: 99%

Perspectives: Evaluation of Older Adult Cochlear Implant Candidates for Fall Risk in a Developing Country Setting

Rogers

2021

Front. Neurol.

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Dizziness, vertigo, and falls are common in older adults. Data suggest that cochlear implant candidates are no different and could be argued to be at elevated risk due to the presence of hearing loss and likely vestibular involvement. Perspectives contextualizes current testing and screening paradigms for vestibular deficits and fall risk and suggests a protocol suitable for use in developing country settings.

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“…Different types of nystagmus can be categorized by analyzing the fast and slow phase or the alternating slow phase of eye movement. Existing studies of nystagmus have provided a review of the critical clinical literature, in order to support state-of-the-art differential diagnosis [ 11 ], and have discussed the clinical features of nystagmus and its relation to ocular motility disorder [ 12 , 13 , 14 ]. Existing studies have also focused on the treatment and therapy process [ 15 , 16 ], and case-by-case of nystagmus in specific subject categories [ 17 , 18 ] for different forms of nystagmus: vertical, positional, head-shaking and vibration-induced, and vestibular nystagmus.…”

Section: Introductionmentioning

confidence: 99%

Nystagmus Estimation for Dizziness Diagnosis by Pupil Detection and Tracking Using Mexican-Hat-Type Ellipse Pattern Matching

et al. 2021

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The detection of nystagmus using video oculography experiences accuracy problems when patients who complain of dizziness have difficulty in fully opening their eyes. Pupil detection and tracking in this condition affect the accuracy of the nystagmus waveform. In this research, we design a pupil detection method using a pattern matching approach that approximates the pupil using a Mexican hat-type ellipse pattern, in order to deal with the aforementioned problem. We evaluate the performance of the proposed method, in comparison with that of a conventional Hough transform method, for eye movement videos retrieved from Gifu University Hospital. The performance results show that the proposed method can detect and track the pupil position, even when only 20% of the pupil is visible. In comparison, the conventional Hough transform only indicates good performance when 90% of the pupil is visible. We also evaluate the proposed method using the Labelled Pupil in the Wild (LPW) data set. The results show that the proposed method has an accuracy of 1.47, as evaluated using the Mean Square Error (MSE), which is much lower than that of the conventional Hough transform method, with an MSE of 9.53. We conduct expert validation by consulting three medical specialists regarding the nystagmus waveform. The medical specialists agreed that the waveform can be evaluated clinically, without contradicting their diagnoses.

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Nystagmus

Cited by 25 publications

References 76 publications

Clinical and electrophysiological results of eye muscle surgery in 17 patients with downbeat nystagmus

Clinical and electrophysiological results of eye muscle surgery in 17 patients with downbeat nystagmus

Perspectives: Evaluation of Older Adult Cochlear Implant Candidates for Fall Risk in a Developing Country Setting

Nystagmus Estimation for Dizziness Diagnosis by Pupil Detection and Tracking Using Mexican-Hat-Type Ellipse Pattern Matching

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