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The Multifocal On- and Off-Responses in the Human Diabetic Retina.
Jenny C Y Lung1, Peter G Swann1,2, Henry H L Chan1
1Laboratory of Experimental Optometry (Neuroscience), School of Optometry, The Hong Kong Polytechnic University, Hong Kong SAR, China.
Plos One
|May 18, 2016
Summary
Early diabetes mellitus (DM) alters retinal responses. Diabetic patients show an imbalanced lateral antagonism, impacting visual processing, particularly with blue light stimulation.
Area of Science:
- Ophthalmology
- Neuroscience
- Diabetology
Background:
- Diabetes mellitus (DM) can affect retinal function, even in early stages.
- Understanding early changes in retinal electrophysiology is crucial for managing diabetic complications.
Purpose of the Study:
- To investigate the on- and off-responses in the human diabetic retina using a long-duration multifocal electroretinogram (mfERG).
- To evaluate changes in retinal antagonistic interactions in the early stages of DM.
Main Methods:
- Recruited 20 type II diabetic patients (no/mild NPDR) and 21 age-matched controls.
- Performed "long-duration" mfERG with 61-hexagon stimulus under white/black and blue/black chromatic conditions at matched luminance.
- Analyzed amplitudes and implicit times of on-response (N1, P1, N2) and off-response (P2) components.
Main Results:
- Blue stimulation increased mfERG amplitudes (P1, N2, P2) compared to white stimulation in both groups.
- Diabetic group showed significantly greater N2 amplitude under white light in mid-retinal regions.
- Diabetic group exhibited a smaller percentage change in N2 amplitude with blue light shift in peripheral regions.
Conclusions:
- Increased N2 amplitude in diabetics suggests an imbalance in lateral antagonism.
- Reduced N2 amplitude change with chromatic shift indicates impaired retinal cross-talk in early DM.
- These findings highlight early functional alterations in the diabetic retina.
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