Welsh K W, Vaughan J A, Rasmussen P G
Aviat Space Environ Med. 1979 Mar;50(3):249-55.
A red contact lens (X-Chrom lens) worn on the nondominant eye by 12 color-defective subjects caused significant improvements on the Dvorine, Ishihara, and Hardy-Rand-Rittler pseudo-isochromatic color plate tests. Color vision scores on the Farnsworth Lantern, Color Threshold Tester, and Aviation Signal Light Gun were not improved. Minimal changes were found on the Farnsworth D-15 test, aeronautical chart color identification task, visual acuity, phoria, and stereoscopic depth perception. Control and color-defective subjects perceived a change in the path of a pendulum (Pulfrich test) when viewing through the X-Chrom lens or a monocular red filter. The X-Chrom lens may require extended wearing before its optimum effect becomes apparent.
12名色觉缺陷受试者在非优势眼佩戴红色隐形眼镜（X-Chrom镜片）后，在Dvorine、石原和Hardy-Rand-Rittler伪等色图测试中取得了显著改善。在Farnsworth信号灯、颜色阈值测试仪和航空信号灯枪测试中的色觉分数没有提高。在Farnsworth D-15测试、航空图颜色识别任务、视力、隐斜视和立体深度感知方面发现变化极小。对照组和色觉缺陷受试者通过X-Chrom镜片或单眼红色滤光片观察时，能感觉到摆锤路径的变化（普尔弗里希测试）。X-Chrom镜片可能需要长时间佩戴才能显现出最佳效果。
