Color vision deficiency, or color blindness, is an incurable condition in which the affected person cannot distinguish one or more colors from one another. This deficiency is more common than you might believe: It affects 8 percent of boys and 0.5...
Each cell within the human body contains thousands of genes, which collectively make up the genome. The genes are arranged in larger groupings, called chromosomes, and most cells within the human body contain a pair of 23 different chromosomes,...
People with color blindness aren't blind in any way--they just have trouble distinguishing between certain color groups. Most color blind people do see colors---they just don't see them in the same way that other people see them. Color blind...
Being blind generally refers to a complete lack of functional vision. However, blindness involves varying levels of vision ability, sometimes under varying conditions. Vision is the result of light rays hitting the back of the eye, or retina, and...
The human genome--the whole of a person's DNA--contains thousands of genes. Each person has two copies of most genes, called alleles, with one allele inherited from the mother and one from the father. During development and throughout life, the...
Multiple sclerosis (MS) is a chronic medical condition that causes the progressive destruction of myelin---a type of tissue that protects the nerves that run throughout the central nervous system. An estimated 400,000 people in the United States...
Multiple sclerosis typically appears from the ages of 20 to 40. Women experience multiple sclerosis more than men. This disease involves malfunction of the central nervous system. The communication system between the brain and various areas of the...
Multiple sclerosis, or MS, refers to the many areas of scarring that result from the destruction of the tissues that wrap around nerves. The tissues that surround the nerves facilitate the transmission of electrochemical messages between the...
Multiple sclerosis (MS) is a complex neurological condition that is difficult to diagnose. Some patients go for years before a diagnosis is confirmed. The nerves that carry signals throughout your body are protected by a fatty covering called...
People who are colorblind are unable to see certain colors normally, according to the online medical encyclopedia MedlinePlus. There are several different types of color blindness, which vary based on the colors that are undetectable and the...
Color blindness is a visual deficiency that is characterized by the inability to see certain colors. To understand how this condition affects the eye, it is necessary to understand how the eye perceives color. The eye operates like a camera with...
If you are concerned about your kids growing up among a nation of couch potatoes with nature deficit disorder, what better way to combat the problem than by getting your kids exercising outside? Just don't use the word exercise Before the age of...
For children who are color-blind, red, orange, yellow and green may be different names for what they perceive as the same color. Children who are color-blind can see color, just not the same colors as people with normal vision. The American...
