Differential effects of optic media opacities on simultaneous multifocal pattern electroretinograms and visual evoked...

Area of Science:

• Ophthalmology and Visual Neuroscience
• Electrophysiology
• Retinal and Cortical Function Assessment

Background:

• Simultaneous recording of multifocal electroretinograms (mfPERGs) and visual evoked potentials (mfVEPs) offers a method to compare retinal and cortical function.
• Understanding potential confounds is crucial for accurate interpretation of these simultaneous recordings.

Purpose of the Study:

• To identify potential confounding factors in the simultaneous acquisition of mfPERGs and mfVEPs.
• To assess the impact of simulated optic media opacities (blur and reduced luminance) on mfPERG and mfVEP responses.

Main Methods:

• Monocular mfPERGs and mfVEPs were simultaneously recorded using pattern-reversal stimulation in participants with normal vision.
• Two filter conditions, blur and 8% luminance transmission, were applied to assess their impact on response amplitude and timing.

Main Results:

• Blur significantly reduced mfPERG amplitudes (P50 and N95) and mfVEP magnitude.
• Reduced luminance affected mfPERG amplitudes but not mfVEP magnitude, while delaying both mfPERG and mfVEP responses.
• Stimulus manipulations demonstrated differential effects on mfPERG and mfVEP magnitudes and timing.

Conclusions:

• Minor stimulus alterations mimicking optic media opacities differentially impact mfPERG and mfVEP magnitudes.
• While simultaneous mfPERG/mfVEP recordings are promising for comparing retinal and cortical function, incongruent response characteristics necessitate caution in interpreting differences.