Electroretinographic wet electrode

Carpi, Federico; Benini, G; Tomei, Francesca; Figliuzzi, Rosa Maria; Napoli, Alberto De

doi:10.1016/j.medengphy.2009.05.003

Cited by 2 publications

(2 citation statements)

References 13 publications

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“…Stringent requirements for visual acuity need to be met during mfERG recording. Many corneal contact lens electrodes, such as the Jet electrodes, are not normally used in mfERG recording because they tend to alter the eye’s refraction 2 , 41 . The existence of thick and uneven tear film in the gap between the stiff contact lens electrodes and cornea can induce a refractive error.…”

Section: Discussionmentioning

confidence: 99%

Soft transparent graphene contact lens electrodes for conformal full-cornea recording of electroretinogram

et al. 2018

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Visual electrophysiology measurements are important for ophthalmic diagnostic testing. Electrodes with combined optical transparency and softness are highly desirable, and sometimes indispensable for many ocular electrophysiology measurements. Here we report the fabrication of soft graphene contact lens electrodes (GRACEs) with broad-spectrum optical transparency, and their application in conformal, full-cornea recording of electroretinography (ERG) from cynomolgus monkeys. The GRACEs give higher signal amplitude than conventional ERG electrodes in recordings of various full-field ERG responses. High-quality topographic mapping of multifocal ERG under simultaneous fundus monitoring is realized. A conformal and tight interface between the GRACEs and cornea is revealed. Neither corneal irritation nor abnormal behavior of the animals is observed after ERG measurements with GRACEs. Furthermore, spatially resolved ERG recordings on rabbits with graphene multi-electrode array reveal a stronger signal at the central cornea than the periphery. These results demonstrate the unique capabilities of the graphene-based electrodes for in vivo visual electrophysiology studies.

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Section: Discussionmentioning

confidence: 99%

Soft transparent graphene contact lens electrodes for conformal full-cornea recording of electroretinogram

et al. 2018

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“…It is well known that the amplitudes and signal to noise of the recorded signal can vary depending on the type of ERG electrode being used. 7 – 9 The current commercially available ERG electrodes vary in design and the materials used (see Supplementary Fig. S1 ), however, there is little information in the literature comparing their electrical performance.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of Electrical Performance and Properties of Electroretinography Electrodes

Man

Yip

Cheung

et al. 2020

Trans. Vis. Sci. Tech.

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The aim of this study was to evaluate and compare the electrical performance and properties of commercially available electroretinography (ERG) electrodes. Methods: A passive ionic model was used to measure impedance, noise, and potential drift in 10 types of ocular surface and skin ERG electrodes. Results: The impedance for silver-based ocular electrodes are generally lower (range, 65.35-343.3 Ω) with smaller phase angles (range, −6.41°to −33.91°) than gold-based electrodes (impedance ranged from 285.95 Ω to 2.913 kΩ, and phase angle ranged from −59.65°to −70.01°). Silver-based ocular electrodes have less noise (median line noise of 6.48 x 10 4 nV 2 /Hz) than gold-based electrodes (median line noise of 2.26 x 10 5 nV 2 /Hz). Although silver-based electrodes usually achieve a drift rate less than 5 μV/s within 15 minutes, gold-base ocular electrode cannot achieve a stable potential. The exception is the RETeval strip type of silver electrode, which had an unusual drift at 20 minutes. The noise spectral density showed no change over time indicating that noise was not dependent on the stabilization of the electrode. Conclusions: From the range of electrodes tested, lower impedance, lower capacitance, and lower noise was observed in silver-based electrodes. Stabilization of an electrode is effective against drift of the electrode potential difference but not the noise. Translational Relevance: Application of electrodes with optimized materials improve the quality of clinical electrophysiology signals and efficiency of the recording.

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Electroretinographic wet electrode

Cited by 2 publications

References 13 publications

Soft transparent graphene contact lens electrodes for conformal full-cornea recording of electroretinogram

Soft transparent graphene contact lens electrodes for conformal full-cornea recording of electroretinogram

Evaluation of Electrical Performance and Properties of Electroretinography Electrodes

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