Color blindness is not a form of blindness at all, but a deficiency in the way you see color. With this vision problem, you have difficulty distinguishing certain colors, such as blue and yellow or red and green.Color blindness (or, more accurately, color vision deficiency) is an inherited condition that affects males more frequently than females.According to Prevent Blindness America, an estimated 8 percent of males and less than 1 percent of females have color vision problems.ed-green color deficiency is the most common form of color blindness. Much more rarely, a person may inherit a trait that reduces the ability to see blue and yellow hues.
5. Ascending aorta, right aortic arch, left aortic arch, connecting to the descending aorta. 6. A vascular ring involves the aorta, its branches and sometimes remnants of vascular structures forming a ring around trachea and esophagus. A vascular sling involves the pulmonary artery.
A third type of vascular ring is the right aortic arch with mirror image (to the normal left aortic arch) branching vessels. It results from persistence of the right dorsal aorta and regression of the left dorsal aorta. A complete ring is formed only if the ductus arises from the upper descending aorta.