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목적 : The Worth 4-dot (W4D) test uses red and green glasses for binocular dissociation, and although it has been believed that patients with red-green (R-G) color vision defect cannot accurately perform the W4D test, this has not been validated. Therefore, the purpose of this study was to demonstrate the validity of the W4D test in congenital red-green (R-G) color vision defect patients who have normal or abnormal binocular stereopsis.
방법 : A retrospective review of medical records was performed on 29 consecutive congenital R-G color vision defect patients who underwent the W4D test. The type of color vision anomaly was determined by the Hardy Rand and Rittler (HRR) pseudoisochromatic plate test, Ishihara color test, anomaloscope and/or the 100 hue test. All patients underwent a complete ophthalmologic examination. Binocular sensory status was evaluated with the W4D test and Randot stereotest and the results were interpreted according to the presence of strabismus or amblyopia.
결과 : Among the 29 patients, 23 had normal visual acuity without strabismus nor amblyopia and 6 patients had strabismus and/or amblyopia. The 23 patients without strabismus nor amblyopia all showed binocular fusional responses by seeing 4 dots of the W4D test. Meanwhile, the 6 patients with strabismus or amblyopia showed various results of fusion, suppression and diplopia.
결론 : Congenital R-G color vision defect patients of different types and variable degree of binocular stereopsis could successfully perform the W4D test. They showed reliable results that were in accordance with their estimated sensory status.
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