Early local functional changes in the human diabetic retina: a global flash multifocal electroretinogram study

Area of Science:

• Ophthalmology
• Diabetic Retinopathy Research
• Retinal Electrophysiology

Background:

• Type II diabetes mellitus (T2DM) can lead to diabetic retinopathy (DR), a leading cause of vision loss.
• Early detection of functional retinal changes is crucial for managing T2DM complications.
• Existing methods may not detect subtle, early-stage functional deficits.

Purpose of the Study:

• To evaluate the utility of the global flash multifocal electroretinogram (MOFO mfERG) in identifying early functional anomalies in the retinas of T2DM patients.
• To correlate MOFO mfERG findings with the presence and severity of diabetic retinopathy.

Main Methods:

• Thirty-eight T2DM patients and 14 controls underwent MOFO mfERG at high and low contrast levels.
• Retinal responses were analyzed in 35 localized regions and compared with DR classification.
• Z-scores of regional mfERG responses were used to assess differences across DR severity.

Main Results:

• Reduced amplitudes of both direct (DC) and induced (IC) components of the mfERG waveform were observed in diabetic patients, with or without DR.
• A progressive decline in DC and IC amplitudes correlated with increasing DR severity.
• mfERG amplitude proved to be a valuable screening parameter under the MOFO paradigm.

Conclusions:

• MOFO mfERG is effective in detecting early functional retinal abnormalities in T2DM patients, preceding visible DR signs.
• This technique can aid in monitoring the progression of functional deterioration in diabetic eyes.
• MOFO mfERG offers a promising tool for early intervention and management of diabetic eye disease.