41. Most clinical tests are designed to be fast, simple, and effective at identifying broad categories of color blindness . 42. In the 1940s, he conducted an experiment with color blindness that was treated with cobra venom and vitamins. 43. According to this theory, color blindness is due to the lack of a particular chemical in the eye. 44. Inherited color blindness can be congenital ( from birth ), or it can commence in childhood or adulthood. 45. This will still cause problems for those with monochromatic color blindness , but it is still something worth considering. 46. This has been known to cause problems for people with color blindness who are unfamiliar with the area. 47. An April paper reported that gene therapy addressed achromatopsia ( color blindness ) in dogs by targeting cone photoreceptors. 48. Isolated communities with a restricted gene pool sometimes produce high proportions of color blindness , including the less usual types. 49. Do not use color to mark differences in text : they may be invisible to people with color blindness . 50. NAACP has also threatened to sue any employer or licensing board that tries to test people for color blindness .
