The toxic amblyopias: their classification, history, symptoms, pathology, and treatment . Fig. 16. M 90 R. Before deciding that there is a scotoma for red andgreen, the examiner should be sure that there is no non-toxic red-green blindness. Under these circumstanceshe would be obliged to make use of blue and yellowtests, and under any conditions it is well to employthese colors. 76 TOXIC AMBLYOPIAS. In the beginning of the tobacco-amblyopia the sco-toma is relative. It is a color-scotoma, and the patient Fig. 17. L->

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