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StudyOphthalmic & physiological optics : the journal of the British College of Ophthalmic Opticians (Optometrists) · 2026

Predicting Letter Acuity Using Vernier-Induced OKN and Consumer-Grade Cameras.

Jinyou Zou, Huan Li, Zhikuan Yang, Weizhong Lan

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OphthalmologyStudy

An eye-movement-based test accurately detects reduced visual acuity worse than 0.50 logMAR.

Predicting Letter Acuity Using Vernier-Induced OKN and Consumer-Grade Cameras.

Jinyou Zou … Weizhong Lan

Ophthalmic & physiological optics : the journal of the British College of Ophthalmic Opticians (Optometrists) · 2026

Background

Optokinetic nystagmus (optokinetic nystagmus) is used for objective visual acuity assessment, but precise quantification remains challenging and requires specialised eye trackers.

Purpose

Optokinetic nystagmus (optokinetic nystagmus) is used for objective visual acuity assessment, but precise quantification remains challenging and requires specialised eye trackers.

Methods

Thirty-nine adults completed uncorrected monocular testing (letter acuity: -0.10 to 1.00logMAR).

Results

test very accurately identified eyes with vision worse than the cutoff

Eye tracker

0.97AUC

USB camera

0.95AUC

More results

Subjective letter acuity showed strong correlations with relative optokinetic nystagmus indexes from the eye tracker (r = 0.82, p < 0.001) and USB camera (r = 0.76, p < 0.001) recordings, and their letter acuity predictions had mean absolute errors of 0.15 and 0.16 logMAR, respectively.

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Conclusion

This study provides proof-of-concept for applying optokinetic nystagmus-based vernier acuity measurement in adults with or without eye trackers, although extension to a paediatric cohorts requires future investigation.

Post

Predicting Letter Acuity Using Vernier-Induced OKN and Consumer-Grade Cameras.

An eye-movement-based test accurately detects reduced visual acuity worse than 0.50 logMAR.

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