Abstract
Don MacLeod taught me many things, but in the scientific realm, the most memorable was learning how to bleach my short-wavelength cones. This involved funneling an enormous amount of light through a small violet filter and into my right eye for about 1 minute. This is no longer allowed, so my reports may help some understand what the world looks like without short-wavelength cones. Don and I, along with Stuart Anstis, used this procedure to evaluate the B-cone input to luminance using the minimum motion technique. Recent work led by Pierre Pouget and Pierre Daye has shown that pupillometry offers a new way to test equiluminance without requiring conscious cooperation from the subject. The test results are similar to those of the minimum motion procedure.