Color+Blindness

Walker Bartz Biology 1 honors First block Miss Beatty

Deuteranopia
 * Introduction: Deuteranopia is a type of the genetic disorder known as color blindness, which is the inability for people to see certain colors. Deuteranopia can also be referred to as red-green color blindness.

This picture shows how x linked recessive disorders work. as you can see the gene for color blindness in the mother can often be passed down to her offspring. Two of the four children do not receive the gene from their mother but the other two do. The daughter becomes a carrier for the gene while the son is affected with Deuteranopia. this is because the son only has one x chromosome, so if one gene is defected, then it can't be overridden by the other x chromosome, like in the daughter. for the daughter to be affected, she must have both x chromosomes with the affected gene.
 * Mode of inheritance:Deuteranopia is a sex linked recessive disorder. That means that it occurs when one or both x chromosomes are infected. Deuteranopia happens when the medium wavelength receptor gene are missing from the ocular cell. Deuteranopia can also occur when their is a swelling in the optical lobe of the brain that is caused by accidents or trauma.It can also be caused by over exposure to ultraviolet lights.


 * Clinical description: Deuteranopia causes a person to not be able to see the colors red and green. They also have trouble telling gray, purple, and blue hues apart from each other. Externally your eye looks like every other normal eye, but internally you are missing the medium wavelength receptor gene or cone that allowed you to see colors vividly. In countries such as Romania and Turkey, having this disorder prevents you from getting your drivers license. You are also incapable of becoming a pilot. Deuteranopia is mostly found in males due to the fact that there is only one x chromosome opposed to a female who has two. Because of this, Deuteranopia is more commonly found in males than in females. Males have a 1% chance of having Deuteranopia as opposed to the .001% chance that females have.


 * Treatment:Unfortunately, there is no permanent treatment for Deuteranopia, but they do make contact lenses that people with Deuteranopia can put in their eyes that help them distinguish color hues better. Unfortunately this comes with side effects. These contacts may distort objects to the user. They also make glasses that reduce or block the glare that allow them to see colors at a less intense glare.This is because people with Deuteranopia can see colors whenever there is less light.


 * Detection: Deuteranopia can not be detected before symptoms start or prenatally. There is no way to detect if someone is a carrier of the disorder. Symptoms do start at birth since Deuteranopia is a congenital disease. A test they can run for Deuteranopia or color blindness in general is called the Ishihara test.

This is an example of the Ishihara test. this test is designed to tell you your specific kind of color blindness. This example is the test for Deuteranopia. In the middle is the number 49. A patient with Deuteranopia is incapable of seeing the number.

http://www.wisegeek.com/what-is-deuteranopia.htm http://www.colblindor.com/2007/04/17/deuteranopia-red-green-color-blindness/ http://www.webmd.com/eye-health/tc/color-blindness-treatment-overview http://en.wikipedia.org/wiki/Color_blindness
 * Sources.
 * Lloyd, Emma. "What Is Deuteranopia?" __wiseGEEK.__ 25/April/2010.
 * Fluck, Daniel. "Deuteranopia-Red-Green Color Blindness." __Colblindor.__ 27/April/2007.
 * "Color Blindness-Treatment Overview" __WebMD.__ 7/October/2009.
 * "Color blindness." __Wikipedia__. 23/April/2010. 25/April/2010