An Indelible "3-object" Comparative Test for Central Colour Scotoma-also in Cases of Congenital Colour Abnormalities.

SINCE 1905 1 have pLublished several articles in the Norw7egian, French, and German languages (Lit. 1, 2, 3, 4, 6, and 7) on a rapid Cand extremely sensitive comparative metlhod for thie detection of central or paracentral colour scotoma, duie to axial intoxication of, or axial inflammiation in, the optic nerve. In the disctussion on Perimetric Alethods at Oxford, 1920, I demonstrated the 1914 model of my, chord perimeter, with the "3-Objects" as celluloid discs on the outside of the two rtules (Brit. Ji. of Op lit/ila., V'ol. IV, pp. 470-473, 19290); but otherwise I have not published anything in Engylish on the "3-Object" Test. The following Xyear I intr-odtuced Engelking and Eckstein's C oloour Cartoons (Lit. 5) for my "'3-Object" Test (Lit. 6); these