ArticleFrontiers in neuroscience2026
Landolt C acuity follows Bloch's Law for short-duration flashes.
Article in Frontiers in neuroscience, 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
Purpose: Bloch's Law states that up to a critical duration, typically between 30 and 100 ms, the detection of a flash depends on its total strength (the product of luminance and duration). This study investigated whether this principle of temporal summation extends to shape recognition, assessed via optotype-based visual acuity. Methods: Monocular Landolt-C acuity was measured in 19 healthy participants across 25 stimulus conditions. These conditions combined five photopic luminance levels (3.3-53 cd/m Results: Across Flash Strength Levels 1 to 4, mean visual acuity remained nearly constant within each level, with deviations below 0.08 logMAR (less than one line on a typical acuity chart). In contrast, at Level 5 (32-512 ms), visual acuity improved significantly by two lines, with the strongest increase occurring around 100 ms. Conclusion: The results demonstrate that a "Bloch-like" law also governs shape recognition. Across four octaves in luminance and three orders of magnitude in duration, reductions in luminance were effectively compensated by longer presentation times and vice versa.
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