Unlike Snellen, LogMAR provides a linear scale where each line represents a change of 0.1 log units. This allows for parametric statistical analysis and more accurate tracking of progression in low-vision patients.
The Evidence
Primary Reference
New design principles for visual acuity letter charts
Bailey IL et al. • Am J Optom Physiol Opt. 1976;53(11):740-5
Last Comprehensive Review: 2026-07-17
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