ArticleDocumenta ophthalmologica. Advances in ophthalmology2026
Structure-function relationship between handheld photopic negative response and macular GCIPL thickness in chronic optic neuropathy.
Article in Documenta ophthalmologica. Advances in ophthalmology, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
purposeTo determine whether photopic negative response (PhNR) parameters obtained using a handheld electroretinography (ERG) device reflect quantitative indicators of residual retinal ganglion cell (RGC)-driven inner retinal function and how these functional measures relate to OCT-derived structural metrics in chronic unilateral non-glaucomatous optic neuropathy (ON).
methodsIn this retrospective observational study, 27 patients (54 eyes) with unilateral chronic ON were examined using handheld full-field photopic ERG (RETeval™, LKC Technologies) without pupil dilation or corneal electrodes. Several ERG parameters, including the PhNR72 amplitude, PhNR minimum amplitude, P-ratio, and W-ratio, were analyzed. Optical coherence tomography (OCT)-derived ganglion cell-inner plexiform layer (GCIPL) and retinal nerve fiber layer (RNFL) thicknesses, and Humphrey field analyzer (HFA) indices were acquired on the same day. Linear mixed-effects models accounting for intereye correlation and false discovery rate (FDR) correction were used to assess structure-function relationships.
resultsON eyes showed significantly reduced PhNR72 and PhNR minimum amplitudes, and lower P-ratio (PhNR72/b-wave) and W-ratio (PhNR minimum/(b-wave minus a-wave) (all p < 0.01) compared with unaffected eyesof the patients. In multivariable models, the W-ratio was independently associated with GCIPL thickness in the inferotemporal sector (β = 0.45; 95% CI, 0.22-0.68; FDR-adjusted p < 0.05), whereas no significant associations were found with RNFL thickness or HFA indices.
conclusionsHandheld photopic ERG-derived PhNR parameters, particularly the W-ratio, are selectively associated with GCIPL thickness, suggesting preferential coupling with RGC-driven inner retinal function rather than axonal or field-level measures. Thus, portable ERG provides a practical functional biomarker complementary to OCT for evaluating residual RGC-driven inner retinal function in chronic ON.
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