PubMed Health⌕ Search
Home/Archive/PubMed

PubMed · 12465225

[Measuring eyelid reflex with electroblepharography].

J Hofmann·K Dollinger·H D Reidenbach
View original source ↗Export metadata ↓

Abstract

Safety regulations concerning the handling of low power lasers in the visible region (Class 2, according to DIN EN 60825-1) assume that the eye is protected by the eye-blink reflex, which should have completed within 250 ms during laser impact into the eye. A method has been developed to determine the temporal progression of the blink reflex by measuring the biosignal of the upper eyelid movement. In this procedure, which we call Electroblepharography (EBG), the electrical signal of the eyelid muscle is gained by means of self adherent electrode pads and is evaluated and charted after analog signal processing in the EBG-device. The graphical representation of the biopotential corresponds to the temporal position of the upper eyelid. Characteristic values as latency-time, position and velocity of the eyelid can be deduced.

Explore related subjects

BlinkingElectromyographyEvoked Potentials, MotorEyelidsHumansReaction TimeReference ValuesSignal Processing, Computer-AssistedEnglish AbstractJournal Article

Keep this discovery

Explore connections, maps & timelines

BibTeXRIS

J Hofmann, K Dollinger, H D Reidenbach. 2002. [Measuring eyelid reflex with electroblepharography].. https://pubmed.ncbi.nlm.nih.gov/12465225/

Cite the original work for its findings. Save a collection to share your selection of sources.

KEEP EXPLORING

Related citations

PubMed2006

Four-dimensional sonographic assessment of fetal facial expression early in the third trimester.

OBJECTIVE: To evaluate the characteristic patterns of facial expression in fetuses aged from 28 to 34 weeks using 4-dimensional (4-D) ultrasonography. METHODS: The faces of 10 healthy fetuses aged from 28 to 34 weeks were recorded continuously for 15 min with a 4-D ultrasonographic machine performing up to 25 frames per second. The occurrence rates of blinking, mouthing, yawning, tongue expulsion, smiling, scowling, and sucking were evaluated. RESULTS: Mouthing was the most frequent facial expression (median, 6.5; range, 2-19) whereas the least frequent were scowling (median, 1; range, 0-9) and sucking (median, 1; range, 0-2). Mouthing was evident in all fetuses and significantly more frequent than any other movement (P<.05). Yawning (median, 3; range, 0-6), smiling (median, 2; range, 0-9), and blinking (median, 1.5; range, 0-6) were observed in most cases. Tongue expulsion (median, 1.5; range, 0-5), scowling, and sucking were each observed in 6 cases. CONCLUSION: 4-D sonography provides a means of evaluating fetal facial expression early in the third trimester. It may be a key to predicting fetal brain function and well-being and an important modality in future fetal neurophysiologic research.

Blinking↗
PubMed2006

Motor system inhibition in dopa-responsive dystonia and its modulation by treatment.

Dopa-responsive dystonia (DRD) causes dystonia-parkinsonism, which is abolished by levodopa. The authors assessed short intracortical inhibition and facilitation, silent period, blink reflex recovery cycle, and reciprocal inhibition in seven patients with DRD on and off treatment. Short intracortical inhibition and blink reflex recovery cycle were reduced, but increased with treatment. Silent period was normal on and off treatment. Third phase of reciprocal inhibition was reduced on and off treatment. A discrete pattern of motor inhibitory dysfunction occurs in DRD.

Blinking↗