Evidence map›Paper›PMID 30046929›Full record

ArticleDocumenta ophthalmologica. Advances in ophthalmology2018

Effect of varying skin surface electrode position on electroretinogram responses recorded using a handheld stimulating and recording system.

Angharad E Hobby, Diana Kozareva, Ekaterina Yonova-Doing, Ibtesham T Hossain, Mohamed Katta, Byki Huntjens, Christopher J Hammond, Alison M Binns, Omar A Mahroo

Open access · hybridAbstract readTwin Study
In one paragraph

Article in Documenta ophthalmologica. Advances in ophthalmology, 2018. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 28 papers.

0numbers the graph read from it
0cells of the map it votes in
28citing papers in PubMed
1.1field-weighted citation impact, top 22% of its field
1 · What the graph read from it

What it found

Each row is one number read from the abstract, on the scale the paper reported it, with its interval. Left of the dashed line favours the treatment, right favours the comparator. Under each row is the sentence it came from. New to these charts? A ten-minute tutorial.

The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.

2 · The registry

The trial behind it

Trials whose registry record cites this paper, or whose number appears in the abstract. A trial that started after this paper was published is citing it as background, not reporting it.

Neither the registry nor the abstract names a trial number. If this is a trial report, that itself is worth knowing.

3 · Its place in the literature

Who cites it

28 citing papers in PubMed, 36 citations in OpenAlex.

  1. Article
  2. Intra- and inter-examiner reliability of ERGs recorded with two types of skin electrodes.Documenta ophthalmologica. Advances in ophthalmology · 2026
    Article
  3. Review
  4. Article
  5. Article
  6. Measuring differences in the ERG in myopia using the RETeval device with skin electrodes.Ophthalmic & physiological optics : the journal of the British College of Ophthalmic Opticians (Optometrists) · 2025
    Article
  7. Article
  8. Article
  9. Electroretinographic Evaluations of Eyes With Endophthalmitis.Translational vision science & technology · 2024
    Article
  10. Article
  11. Article
  12. Article
  13. Article
  14. Full-field electroretinogram recorded with skin electrodes in 6- to 12-year-old children.Documenta ophthalmologica. Advances in ophthalmology · 2023
    Article
  15. Review
  16. Article
  17. Article
  18. Article
  19. Article
  20. Article
4 · The record

Corrections and comments

PubMed lists nothing against this paper. Absence here is not a guarantee, only a check that was made.

5 · Who and what money

Authors and funding

9 authors at 2 institutions in 1 country.

Angharad E HobbyDepartment of Ophthalmology, King's College London, St Thomas' Hospital Campus, London, SE1 7EH, UK.
Diana KozarevaDepartment of Ophthalmology, King's College London, St Thomas' Hospital Campus, London, SE1 7EH, UK.
Ekaterina Yonova-DoingDepartment of Ophthalmology, King's College London, St Thomas' Hospital Campus, London, SE1 7EH, UK.
Ibtesham T HossainDepartment of Ophthalmology, King's College London, St Thomas' Hospital Campus, London, SE1 7EH, UK.
Mohamed KattaDepartment of Ophthalmology, King's College London, St Thomas' Hospital Campus, London, SE1 7EH, UK.
Byki HuntjensCentre of Applied Vision Research, City, University of London, Northampton Square, London, EC1V 0HB, UK.
Christopher J HammondDepartment of Ophthalmology, King's College London, St Thomas' Hospital Campus, London, SE1 7EH, UK.
Alison M BinnsCentre of Applied Vision Research, City, University of London, Northampton Square, London, EC1V 0HB, UK.
Omar A MahrooDepartment of Ophthalmology, King's College London, St Thomas' Hospital Campus, London, SE1 7EH, UK. omar.mahroo@moorfields.nhs.uk.ORCID http://orcid.org/0000-0003-1254-0832
St Thomas' Hospital · GBCity, University of London · GB

Funding

Birdshot Uveitis Society 24BU141Fight for Sight UK 1409/10Thomas Pocklington Trust 24TPT16Wellcome TrustWellcome Trust 206619/Z/17/Z
6 · The paper itself

Abstract

purposeA handheld device (the RETeval system, LKC Technologies) aims to increase the ease of electroretinogram (ERG) recording by using specially designed skin electrodes, rather than corneal electrodes. We explored effects of electrode position on response parameters recorded using this device.

methodsHealthy adult twins were recruited from the TwinsUK cohort and underwent recording of light-adapted flicker ERGs (corresponding to international standard stimuli). In Group 1, skin electrodes were placed in a "comfortable" position, which was up to 20 mm below the lid margin. For subsequent participants (Group 2), the electrode was positioned 2 mm from the lid margin as recommended by the manufacturer. Amplitudes and peak times (averaged from both eyes) were compared between groups after age-matching and inclusion of only one twin per pair. Light-adapted flicker and flash ERGs were recorded for an additional 10 healthy subjects in two consecutive recording sessions: in the test eye, electrode position was varied from 2 to 10-20 mm below the lid margin between sessions; in the fellow (control) eye, the electrode was 2 mm below the lid margin throughout. Amplitudes and peak times (test eye normalised to control eye) were compared for the two sessions.

resultsIncluding one twin per pair, and age-matching yielded 28 individuals per group. Flicker ERG amplitudes were significantly lower for Group 1 than Group 2 participants (p = 0.0024). However, mean peak times did not differ between groups (p = 0.54). For the subjects in whom electrode position was changed between recording sessions, flash and flicker amplitudes were significantly lower when positioned further from the lid margin (p < 0.005), but peak times were similar (p > 0.5).

conclusionsMoving the skin electrodes further from the lid margin significantly reduces response amplitudes, highlighting the importance of consistent electrode positioning. However, this does not significantly affect peak times. Thus, it may be feasible to adopt a more comfortable position in participants who cannot tolerate the recommended position if analysis is restricted to peak time parameters.

Indexed as

Point-of-Care SystemsAdultAgedCase-Control StudiesElectrodesElectroretinographyEyelidsFeasibility StudiesFemaleHumansMaleMiddle AgedPhotic StimulationRetinaVision TestsElectrodeElectroretinogramRetinaRetinal function

Identifiers

PMID30046929
PMCPMC6153519
OpenAlexW2883718081

What OpenQuestion holds

Textmetadata
LicenceCC BY
Read underepoch 390

Registered trials

None linked

Read under generation 80e0d062 · epoch 390. Bibliography from PubMed, PubMed Central and OpenAlex; grants from NIH RePORTER; trial links from ClinicalTrials.gov; estimates, votes and beliefs from the OpenQuestion graph.