![]() An evaluation of the City University colour vision test. The City University colour vision test, 2nd edition. Keeler Instruments, London (1975).įletcher, R. Xenon arc and Argon laser photocoagulation in the treatment of diabetic disc neovascularization: Effect on colour vision. Diagnosis of defective colour vision using the Nagel anomaloscope. This process is experimental and the keywords may be updated as the learning algorithm improves.īirch, J. These keywords were added by machine and not by the authors. Either edition of the City University test can be used in a test battery to estimate the severity of colour deficiency, if a test format other than the D 15 panel is required. Patients having moderate or severe acquired tritan defects are distinguished and diagnosed correctly by both test editions. Subjects with moderate or severe red-green defects fail both test editions but differential protan/deutan diagnosis is poor. Neither edition of the test was found to be efficient for colour vision screening when viewed with the MacBeth Easel lamp (C.I.E. The screening, diagnostic and grading efficiency of the 1st and 2nd editions of the City University colour vision test was examined for congenital protan and deutan defects and for acquired tritan (type III) defects.
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