Aims To evaluate the ability of multifocal transient pattern electroretinography (mfPERG) to detect neural loss and assess the relationship between mfPERG and visual-field (VF) loss in eyes with chiasmal compression.
Methods 23 eyes from 23 patients with temporal VF defects and band atrophy of the optic nerve and 21 controls underwent standard automated perimetry and mfPERG using a stimulus pattern of 19 rectangles, each consisting of 12 squares. The response was determined for the central rectangle, for the nasal and temporal hemifields (eight rectangles each) and for each quadrant (three rectangles) in both patients and controls. Comparisons were made using variance analysis. Correlations between VF and mfPERG measurements were verified by linear regression analysis.
Results Mean±SD mfPERG amplitudes from the temporal hemifield (0.50±0.17 and 0.62±0.32) and temporal quadrants (superior 0.42±0.21 and 0.52±0.35, inferior 0.51±0.23 and 0.74±0.40) were significantly lower in eyes with band atrophy than in controls (0.78±0.24, 0.89±0.28, 0.73±0.26, 0.96±0.36, 0.79±0.26 and 0.91±0.31, respectively). No significant difference was observed in nasal hemifield measurements. Significant correlations (0.36–0.73) were found between VF relative sensitivity and mfPERG amplitude in different VF sectors.
Conclusions mfPERG amplitude measurements clearly differentiate eyes with temporal VF defect from controls. The good correlation between mfPERG amplitudes and the severity of VF defect suggests that mfPERG may be used as an indicator of ganglion cell dysfunction.
Clinical trial registration number ClinicalTrial.gov identifier number NCT00553761.
- Multifocal pattern electroretinography
- temporal hemianopia
- chiasmal compression
- band atrophy of the optic nerve
- optic nerve
- visual pathway
- diagnostic tests/investigation
- field of vision
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Funding Supported by grants from Conselho Nacional de Desenvolvimento Científico e Tecnológico, CNPq (No 309709/2007-5 and 479716/2008-0), Brasília, Brazil.
Competing interests None.
Patient consent Obtained.
Ethics approval Ethics approval was provided by the Institutional Review Board Ethics Committee (Comissão de Ética para projetos de pesquisa).
Provenance and peer review Not commissioned; externally peer reviewed.