Diabetics are at a higher risk of developing certain eye problems such as cataract, glaucoma, and retinopathy. Retinopathy is one of the most common complications of diabetes, which occurs in people affected by chronic diabetes. It occurs due to damage of the blood vessels of the light-sensitive tissues in the retina and may occur in people with type-1 diabetes or type-2 diabetes. In some cases, there may be swelling of blood vessels and secretion of fluid in the eye. In other cases, there may be a growth of new blood vessels on the surface of the retina. This initially causes abnormality in vision, and if left untreated, can lead to vision loss. The National Eye Institute has reported that about 45% of diabetic adults in the United States suffer from some degree of retinopathy and it is one of the leading causes of blindness in the United States.
There are two major types of diabetes retinopathy: non-proliferative and proliferative. While the former is the early and mild form of the disease, which can cause blurred vision, the latter is the advanced and more severe stage of the disease that may result in vision loss and scarring of the retina.
This condition is classified into four stages depending upon severity of the condition. Mild non-proliferative retinopathy, is the earliest stage of the disease. It causes small balloon-like swelling (microaneurysms) in the blood vessels of the retina. Moderate non-proliferative retinopathy, is the form where some of the blood vessels in the retina get blocked. Non-proliferative retinopathy is caused due to the blockage of blood vessels which supply blood to the retina. In the last stage, that is proliferative retinopathy, the growth of new blood vessels is triggered along the retina. Since these new blood vessels are fragile and abnormal, they may break and cause bleeding in the retina, resulting in hemorrhages. Proteins may leak from these blood vessels, leading to swelling of the retina (edema), which in turn can cause vision loss and blindness.
People with severe diabetes for a longer period of time are at a greater risk. Poor control on diabetes, high cholesterol levels, high blood pressure, and smoking are the risk factors for diabetic neuropathy (damage to nerves due to diabetes). Also, pregnant women with diabetes are at a higher risk of developing this condition.
Many times, there are no visible symptoms for early stages of this condition. However, in the advanced stage of the disease, symptoms such as spots floating, dark streaks or a red film that blocks the vision, and shadows or missing areas of vision might be observed. Also, blurred vision, poor night vision, and vision loss are indicative of this condition. In some cases, abnormal growth of new blood vessels may give rise to some serious complications such as, vitreous hemorrhage, retinal detachment, glaucoma, and blindness. Both the eyes may get affected by this condition.
As soon as the early symptoms of this eye condition start appearing, help of an eye-specialist should be sought. The condition can be diagnosed by carrying out a dilated eye exam. The test is performed by dilating the pupils using eye drops, and then examining the retina. The doctor checks for any abnormal blood vessels, growth of new blood vessels, and scar tissues. Also, the doctor looks for the signs of damage to the nerve tissues, swelling, bleeding or fatty deposits in the retina, bleeding in vitreous (clear, jelly-like substance that fills the center of the eye), and retinal detachment. Some other tests such as retinal photography, also called fluorescein angiography and optical coherence tomography (OCT) might be conducted for the diagnosis of this condition.
The treatment for this eye condition depends upon the type and severity of the condition. The damage caused to the retina is irreversible, hence the treatment is aimed at preventing the disease from getting worse, thereby preventing further damage. Although, no treatment is required for non-proliferative retinopathy, laser treatment can be administered in some cases.
In case of advanced proliferative retinopathy, prompt surgical treatment might be required. There are various other treatment options available, such as focal laser treatment, scatter laser treatment, and vitrectomy. Since diabetes is a long-lasting condition, surgeries do not provide permanent treatment, they only slow down the progression of the condition. Since there is a possibility of further retinal damage and vision loss in diabetic people, it is advisable to go for regular eye checkups even after the treatment.
The only way to prevent this condition is to keep diabetes under control, opt for an appropriate diet, and follow an exercise regimen. Also, blood pressure and cholesterol levels should be kept under control with the help of a nutritious diet and regular exercise regimen. Any change or abnormality in the vision should be immediately reported to an eye specialist.