Peer‑reviewed research confirms:
High reliability between observers
Tight limits of agreement (±0.13 to ±0.19 log units)
Median test time under 4 minutes
This makes the Sonksen LogMAR Test suitable for:
Paediatric ophthalmology
Orthoptics
School screening
Clinical research
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The Sonksen LogMAR Test is a standardised paediatric visual acuity test designed to measure binocular and monocular vision in young children using the internationally accepted logMAR scale. It is one of the most reliable and widely validated acuity tests for children aged 2½ to 9 years.
The Sonksen LogMAR Test (SLT) is a linear visual acuity test developed specifically for young children. It adheres strictly to the logMAR (logarithm of the Minimum Angle of Resolution) standard, which is the international benchmark for visual acuity measurement.
It was designed to:
Provide accurate, repeatable, and standardised acuity measurements
Work effectively with children as young as 2.5 years
Offer age‑normed results for proper clinical interpretation
Large-scale studies (2,991 children aged 2–8.5 years) demonstrated extremely high testability:
99% achieved binocular single acuity
98% achieved binocular linear acuity
94% achieved monocular linear acuity
This makes it one of the most reliable acuity tests for early childhood.
