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Distance doubling visual acuity test: A reliable test for nonorganic visual loss

Zinkernagel, Sebastian ; Mojon, Daniel

In: Graefe's Archive for Clinical and Experimental Ophthalmology, 2009, vol. 247, no. 6, p. 855-858

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    Titre
    • Distance doubling visual acuity test: A reliable test for nonorganic visual loss
    Auteur
    • Zinkernagel, Sebastian. Department of Neuro-Ophthalmology and Strabismology, Kantonsspital, St. Gallen, Switzerland
    • Mojon, Daniel. Department of Neuro-Ophthalmology and Strabismology, Kantonsspital, St. Gallen, Switzerland
    Type de document
    • Postprint
    Langue
    • Anglais
    Publié dans
    • Graefe's Archive for Clinical and Experimental Ophthalmology, 2009, vol. 247, no. 6, p. 855-858. Springer-Verlag
    Autre version électronique
    Identifiant OAI-PMH
    • oai:doc.rero.ch:315042
    Summary
    Background: To determine the value of the distance doubling visual acuity test in the diagnosis of nonorganic visual loss in a comparative observational case series. Methods: Twenty-one consecutive patients with nonorganic visual acuity loss and 21 subjects with organic visual loss as controls were included. Best corrected visual acuity was tested at the normal distance of 5 meters using Landolt Cs. The patient was then repositioned and best corrected visual acuity was tested with the previous optotypes at double the distance via a mirror. Results: Nonorganic visual acuity loss was identified in 21 of 21 patients. Sensitivity and specificity of distance-doubling visual acuity test in functional visual loss were found to be 100% (CI; 83%-100%) and 100% (CI; 82%-100%), respectively. Conclusion: Distance doubling visual acuity test is widely used to detect nonorganic visual loss. Our results show that this test has a high specificity and sensitivity to detect nonorganic visual impairment