"Diabetic eye disease starts when blood vessels in the back of the eye (the retina) balloon out into pouches. Although this stage - called nonproliferative retinopathy - generally does not affect vision, it can progress to a more serious form called proliferative retinopathy. This occurs when damaged blood vessels close off and new, weaker vessels take their place. These new vessels can leak blood, which blocks vision. They can also cause scar tissue to grow and distort the retina. Because the retina can be irreversibly damaged before you notice any change in vision, and because retinopathy can be effectively treated with lasers to minimize vision loss. Kidney disease starts when the blood vessels in the kidney become leaky. These leaky vessels allow protein from the blood to be excreted with urine. (It's this protein that doctors detect when they test for kidney function.) Eventually, some vessels collapse and place more pressure on those that remain. Under this increased load, the remaining blood vessels are also damaged and the kidney may fail. If the disease progresses to this point, a person may have to go on dialysis - where a machine performs the role of the kidney - or receive a kidney transplant." [http://www.genetichealth.com/dbts_consequences_of_diabetes.shtml#Anchor2]
Because the retina can be irreversibly damaged before you notice any change in vision, and because retinopathy can be effectively treated with lasers to minimize vision loss.
Kidney disease starts when the blood vessels in the kidney become leaky. These leaky vessels allow protein from the blood to be excreted with urine. (It's this protein that doctors detect when they test for kidney function.) Eventually, some vessels collapse and place more pressure on those that remain. Under this increased load, the remaining blood vessels are also damaged and the kidney may fail. If the disease progresses to this point, a person may have to go on dialysis - where a machine performs the role of the kidney - or receive a kidney transplant." [http://www.genetichealth.com/dbts_consequences_of_diabetes.shtml#Anchor2]
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