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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.
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.
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.
