Ключевые слова: blind, blindness, brain, chart, circle, clear, color, colorblind, dalton, daltonism, deuteranopia, diagnostic, dichromacy, digit, dots, effect, eye, funny, grey, health, hue, illusion background, indication, invisible, iris, medical, monochrome, nerve, number, optical, orange, patterns, plate, play, protanopia, radiotherapy, randomized, red green, retina, scientific, see, sense, shade, spot, test, various, view, visible, vision, weakness,