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
Blindness (novel) images, is likely of the Catholic variety. Saramago wrote a sequel to "Blindness" in 2004, titled "Seeing" ("Ensaio sobre a lucidez", literal English translation "Essay on lucidity"), which has also been translated into English. The new novel takes place in the same country featured in "Blindness" and features several of the same characters. An English-language film adaptation of "Blindness" was directed by Fernando Meirelles. Filming began in July 2007 and stars Mark Ruffalo as the doctor and Julianne Moore as the doctor's wife. The film opened the 2008 Cannes Film Festival. In 2007 the Drama Desk Award Winning Godlight Theatre