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Trial of Alternating Current Stimulation in Optic Neuropathy (SCT_optnerve)

This study has been completed.
EBS Technologies GmbH
Information provided by (Responsible Party):
Bernhard A. Sabel, University of Magdeburg Identifier:
First received: January 3, 2011
Last updated: September 4, 2013
Last verified: September 2013
Non-invasive brain stimulation can increase cortical excitability in the visual system, but it is not known if this is of clinical value. The investigators now assessed if repetitive, transcranial alternating current stimulation (rtACS) can improve visual field size in patients with optic nerve damage. The investigators hypothesized that rtACS would improve visual functions within the defective visual field sectors of the visual field (primary outcome measure).

Condition Intervention Phase
Optic Nerve Diseases
Optic Nerve Injuries
Optic Neuropathies
Device: Repetitive transorbital alternating current stimulation
Phase 2

Study Type: Interventional
Study Design: Allocation: Randomized
Intervention Model: Parallel Assignment
Masking: Double Blind (Participant, Outcomes Assessor)
Primary Purpose: Treatment
Official Title: Treatment of Patients With Optic Neuropathy Using Transorbital Alternating Current Stimulation - a Randomized Trial

Resource links provided by NLM:

Further study details as provided by University of Magdeburg:

Primary Outcome Measures:
  • Detection Accuracy (DA) Change in Percent Over Baseline Within Defective Visual Field Sectors [ Time Frame: Initial diagnostics (baseline), Post diagnostics ]
    Central visual fields were assessed with computer-based high-resolution perimetry (HRP). Based on such plots, areas of the visual field were characterized as intact, partially damaged or absolutely impaired (blind). Detection accuracy (DA) change in percent above baseline within defective visual field sectors was defined as the primary outcome criterion.

Secondary Outcome Measures:
  • Other Visual and EEG Parameters [ Time Frame: Nov 2006 - Dec 2010 ]
    Secondary outcome parameters included DA in static and kinetic perimetry, reaction time (RT) in HRP, visual acuity (VA), contrast vision, and EEG power spectra.

Enrollment: 22
Study Start Date: November 2006
Study Completion Date: December 2010
Primary Completion Date: December 2010 (Final data collection date for primary outcome measure)
Arms Assigned Interventions
Experimental: rtACS (Verum condition)
Repetitive transorbital alternating current stimulation (rtACS)
Device: Repetitive transorbital alternating current stimulation
Repetitive, transorbital alternating current stimulation (rtACS) was applied with a multi-channel device generating weak current pulses in predetermined firing bursts of 2 to 9 pulses. The amplitude of each current pulse was below 1000µA. Current intensity was individually adjusted according to how well patients perceived phosphenes, i.e. any sensation of flickering light in response to the rtACS stimulation.
Other Name: EBS Alpha Synch
No Intervention: Sham stimulation (placebo condition)
A clicking sound was presented and the same electrode montage set-up was used during rtACS- and placebo-stimulation, except that placebo patients received no current (stimulator turned off)

Detailed Description:
In a prospective, double-blind, randomized, placebo-controlled clinical trial 22 patients with optic nerve damage were randomly assigned to a rtACS- (n=12) or placebo-group (n=10). Visual field measures, visual acuity and EEG-recordings were collected before and after a daily 20-40min treatment for 10-days and at a 2-months-follow-up. Primary outcome measure was detection accuracy (DA) in defective visual field sectors of computer-based high resolution perimetry (HRP). Secondary outcome parameters included DA in static and kinetic perimetry, reaction time (RT) in HRP, visual acuity (VA), contrast vision, and EEG power spectra.

Ages Eligible for Study:   18 Years to 70 Years   (Adult, Senior)
Sexes Eligible for Study:   All
Accepts Healthy Volunteers:   No

Inclusion Criteria

  • patients with optic nerve lesion
  • stable visual field defect with residual vision
  • lesion age at least 6 months

Exclusion Criteria

  • heart pacemakers and any metal artefacts in head and truncus
  • epileptic seizure within the last 3 years
  • photosensitive epilepsy as determined by EEG
  • mental diseases (schizophrenia etc.)
  • unstable diabetes, diabetes causing diabetic retinopathy
  • macular degeneration, maculopathy with decimal visual acuity below 0.4
  • high blood pressure
  • instable or high level of intraocular pressure (i.e. >27 mmHg)
  • presence of an un-operated tumor anywhere in the body
  • total blindness
  • primary or secondary glaucoma
  • pathological nystagmus
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Please refer to this study by its identifier: NCT01270126

Institute of Medical Psychology
Magdeburg, Germany, 39120
Sponsors and Collaborators
University of Magdeburg
EBS Technologies GmbH
Principal Investigator: Bernhard A Sabel, PhD University of Magdeburg
  More Information

Additional Information:
Responsible Party: Bernhard A. Sabel, Study leader, University of Magdeburg Identifier: NCT01270126     History of Changes
Other Study ID Numbers: EBS_optnerve_SCT
Study First Received: January 3, 2011
Results First Received: June 19, 2013
Last Updated: September 4, 2013

Keywords provided by University of Magdeburg:
optic neuropathy
alternating current stimulation
vision recovery

Additional relevant MeSH terms:
Peripheral Nervous System Diseases
Optic Nerve Diseases
Nervous System Diseases
Optic Nerve Injuries
Neuromuscular Diseases
Cranial Nerve Diseases
Eye Diseases
Cranial Nerve Injuries
Craniocerebral Trauma
Trauma, Nervous System
Wounds and Injuries processed this record on April 27, 2017