

Myocarditis, or inflammation of the heart muscle, is a type of cardiomyopathy that occurs as a rare complication of an infection, usually caused by a virus. In mild cases, the only symptoms may be slight chest pain, shortness of breath, and a rapid pulse. In more severe cases, such as those caused by diphtheria, myocarditis...

Color vision deficiency (also called color blindness) is a vision disorder in which a person sees colors differently than other people see them or has difficulty distinguishing shades of some colors. The disorder occurs when malfunctioning receptor cells for color in the retina (the light-sensitive membrane lining the back of the eye)...