Quantitative evaluation of flicker ERG waveforms in low vision patients

Area of Science:

• Ophthalmology
• Neuroscience
• Medical Imaging

Background:

• Low vision impacts millions globally, necessitating objective diagnostic tools for retinal function.
• Traditional flicker electroretinograms (FERGs) provide insights but may lack quantitative precision.
• Differentiating retinal diseases from optic neuropathy is crucial for effective treatment.

Purpose of the Study:

• To compare the diagnostic utility of direct FERG waveform analysis versus discrete Fourier Transform (DFT) analysis.
• To evaluate the sensitivity of these methods in detecting abnormalities in low vision patients with retinal diseases and optic neuropathy.
• To determine the most effective method for quantitative assessment of retinal function in clinical settings.

Main Methods:

• Recorded 30Hz flicker electroretinograms (FERGs) from 46 low vision eyes (retinal disease/optic neuropathy) and 39 normal eyes.
• Analyzed FERG waveforms using direct peak-to-peak amplitude/pseudophase measurement and DFT for fundamental response component (30Hz amplitude/phase).
• Compared abnormality ratios between the two analysis methods across different patient groups.

Main Results:

• All optic neuropathy cases showed normal FERGs.
• DFT analysis revealed significantly higher abnormality ratios for phase (82.6%) compared to direct measurement (60.9%) in retinal disease eyes (P < 0.05).
• Amplitude abnormality ratios showed no significant difference between DFT (71.7%) and direct measurement (60.9%) (P > 0.05).

Conclusions:

• FERGs serve as an objective measure for evaluating retinal function.
• Discrete Fourier Transform (DFT) analysis of FERGs provides a more sensitive and quantitative method for assessing retinal function, particularly in detecting phase abnormalities.
• DFT analysis of FERGs is recommended for improved quantitative evaluation in patients with retinal diseases.