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Related Experiment Video

Updated: May 30, 2026

Multifocal Electroretinograms

Multifocal Electroretinograms

Published on: December 4, 2011

Effect of inner retinal dysfunction on slow double-stimulation multifocal electroretinogram.

Patrick H W Chu¹, Yiu-Fai Ng, Patrick W K Ting

¹Laboratory of Experimental Optometry (Neuroscience), School of Optometry, The Hong Kong Polytechnic University, Hong Kong SAR, China.

The British Journal of Ophthalmology

|August 19, 2011

Summary

This study introduces a novel multifocal electroretinogram (mfERG) method to assess retinal adaptation. The M(1):M(2) ratio effectively identifies inner retinal dysfunction, showing promise for diagnosing retinopathies.

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Last Updated: May 30, 2026

Multifocal Electroretinograms

Multifocal Electroretinograms

Published on: December 4, 2011

Simultaneous ex vivo Functional Testing of Two Retinas by in vivo Electroretinogram System

Simultaneous ex vivo Functional Testing of Two Retinas by in vivo Electroretinogram System

Published on: May 6, 2015

Using the Electroretinogram to Assess Function in the Rodent Retina and the Protective Effects of Remote Limb Ischemic Preconditioning

Using the Electroretinogram to Assess Function in the Rodent Retina and the Protective Effects of Remote Limb Ischemic Preconditioning

Published on: June 9, 2015

Area of Science:

Ophthalmology
Neuroscience
Retinal Physiology

Background:

Inner retinal dysfunction underlies various retinopathies.
Assessing retinal adaptive mechanisms is crucial for understanding disease progression.
Current diagnostic tools may not fully capture temporal visual characteristics.

Purpose of the Study:

To investigate retinal adaptive mechanisms in inner retinal dysfunction.
To validate a novel slow double-stimulation multifocal electroretinogram (mfERG) paradigm.
To evaluate the M(1):M(2) ratio as a functional indicator of retinal health.

Main Methods:

Recorded slow double-stimulation mfERG in Mongolian gerbils after inner retinal suppression (TTX+NMDA).
Utilized a five-frame stimulation sequence with independent m-sequences.
Compared animal data with mfERG recordings from human subjects with and without glaucoma.

Main Results:

The M(1):M(2) ratio significantly decreased after TTX+NMDA administration in gerbils.
A reduced M(1):M(2) ratio in glaucoma patients mirrored the animal model findings.
The M(1):M(2) ratio demonstrated high sensitivity (86%) and specificity (84%) for glaucoma detection.

Conclusions:

The slow double-stimulation mfERG paradigm effectively measures temporal visual characteristics.
The M(1):M(2) ratio serves as an indirect functional indicator of retinal adaptation.
This method holds potential for describing functional variations in diseased retinas and predicting retinopathies.