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Related Experiment Video

Updated: Jun 27, 2026

Binocular Dynamic Visual Acuity in Eyeglass-Corrected Myopic Patients

Binocular Dynamic Visual Acuity in Eyeglass-Corrected Myopic Patients

Published on: March 29, 2022

Distance doubling visual acuity test: a reliable test for nonorganic visual loss.

Sebastian Martin Zinkernagel¹, Daniel Stephane Mojon

¹Department of Neuro-Ophthalmology and Strabismology, Kantonsspital, St. Gallen, Switzerland.

Graefe'S Archive for Clinical and Experimental Ophthalmology = Albrecht Von Graefes Archiv Fur Klinische Und Experimentelle Ophthalmologie

|December 18, 2008

Summary

The distance doubling visual acuity test accurately diagnoses nonorganic visual loss, showing 100% sensitivity and specificity. This simple test is highly effective for identifying functional visual impairment in patients.

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Area of Science:

Ophthalmology
Visual Science

Background:

Nonorganic visual loss (NVL) presents diagnostic challenges.
Accurate diagnosis of NVL is crucial for appropriate patient management.

Purpose of the Study:

To evaluate the diagnostic value of the distance doubling visual acuity test for nonorganic visual loss.
To compare the test's performance against organic visual loss controls.

Main Methods:

A comparative observational case series included 21 patients with NVL and 21 controls with organic visual loss.
Best corrected visual acuity was measured using Landolt Cs at 5 meters and then at 10 meters via a mirror.

Main Results:

The distance doubling visual acuity test correctly identified NVL in all 21 patients.
The test demonstrated 100% sensitivity (CI; 83%-100%) and 100% specificity (CI; 82%-100%) for functional visual loss.

Conclusions:

The distance doubling visual acuity test is a valuable tool for diagnosing nonorganic visual loss.
The test exhibits high sensitivity and specificity, confirming its utility in detecting nonorganic visual impairment.