Color blindness all variations in human color vision involve the red and green receptors in male eyes. It is very rare for males or females to be "blind" to the blue end of the spectrum. The first scientific paper on the subject of color blindness, "Extraordinary facts relating to the vision of colours", was published by the English chemist John Dalton in 1798 after the realization of his own color blindness. Because of Dalton's work, the general condition has been called "daltonism", although in English this term is now used only for deuteranopia. Color codes present particular problems for those with color
The Colour of Blood The Colour of Blood The Colour of Blood, published in 1987, is a political thriller by Northern Irish-Canadian novelist Brian Moore about Stephen Bem, a Cardinal in an unnamed East European country who is in conflict with the Roman Catholic Church hierarchy and finds himself caught in the middle of an escalating revolution. Clancy Sigal, writing in "The New York Times", described the novel as a study of faith under pressure: "Almost in thriller form, it is also a wise and illuminating meditation on the labyrinthine forces at work in a Roman Catholic Communist country like Poland (where Mr. Moore