The best-corrected visual acuity and colour perception should be obtained prior to pupillary examination. Ishihara colour plates, although designed for the assessment of hereditary colour anomalies, provide a widely available test for subtle defects of optic nerve function and the speed of testing and number of errors should be recorded. Likewise, the subjective degree of desaturation of a red target, compared with the normal eye, may be assessed. The pupillary reactions, including an approximate quantitative assessment of a relative afferent pupillary defect, should be tested last.
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