Abstract
Purpose To investigate the correlations of the global flash multifocal electroretinogram (MOFO mfERG) with common clinical visual assessments—Humphrey perimetry and Stratus circumpapillary retinal nerve fiber layer (RNFL) thickness measurement in type II diabetic patients. Methods Forty-two diabetic patients participated in the study: Ten were free from diabetic retinopathy (DR), while the remainder suffered from mild to moderate nonproliferative diabetic retinopathy. Fourteen age-matched controls were recruited for comparison. MOFO mfERG measurements were made under high- and low-contrast conditions. Humphrey central 30-2 perimetry and Stratus OCT circumpapillary RNFL thickness measurements were also performed. Correlations between local values of implicit time and amplitude of the mfERG components [direct component (DC) and induced component (IC)], and perimetric sensitivity and RNFL thickness were evaluated by mapping the localized responses for the three subject groups. Results MOFO mfERG was superior to perimetry and RNFL assessments in showing differences between the diabetic groups (with and without DR) and the controls. All the MOFO mfERG amplitudes (except IC amplitude at high contrast) correlated better with perimetry findings (Pearson’s r ranged from 0.23 to 0.36, p < 0.01) than did the mfERG implicit time at both high and low contrasts across all subject groups. No consistent correlation was found between the mfERG and RNFL assessments for any group or contrast conditions. The responses of the local MOFO mfERG correlated with local perimetric sensitivity but not with RNFL thickness. Conclusion Early functional changes in the diabetic retina seem to occur before morphological changes in the RNFL.
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Acknowledgments
This study was supported by the Associated Fund (Research Postgraduate) from the Hong Kong Polytechnic University, Internal Research Grants (GU585, GU858) and the Niche Areas—Myopia Research (J-BB7P) and Glaucoma Research (J-BB76) from the Hong Kong Polytechnic University. Special thanks to Prof. Brian Brown for his valued assistance.
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Lung, J.C.Y., Swann, P.G., Wong, D.S.H. et al. Global flash multifocal electroretinogram: early detection of local functional changes and its correlations with optical coherence tomography and visual field tests in diabetic eyes. Doc Ophthalmol 125, 123–135 (2012). https://doi.org/10.1007/s10633-012-9343-0
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DOI: https://doi.org/10.1007/s10633-012-9343-0