Höffding step and beyond: The impact of visual sensory impairment on cognitive performance in neuropsychological testing of survivors of acute methanol poisoning.

This article investigates the impact of peripheral visual impairment on neuropsychological test performance in survivors of acute methanol poisoning in the Czech Republic, where methanol metabolites cause toxic damage to the optic nerve. Using electrophysiological methods—visual evoked potentials (VEP) and optical coherence tomography (OCT) measuring retinal nerve fibre layer (RNFL) thickness—alongside comprehensive neuropsychological assessments, the study found small to medium associations (2–11% shared variance) between RNFL thickness, visual field deficits, VEP latency, and performance on visually-driven cognitive tests such as the Stroop test and motor tasks like the Grooved Pegboard and Finger Tapping tests. No significant correlations were observed between visual pathway impairment and non-visually-driven cognitive tests. The findings suggest that sensory visual deficits moderately influence cognitive test outcomes reliant on visual processing, underscoring the need for cautious interpretation of neuropsychological results in individuals with visual pathway damage following methanol poisoning.