September 12, 2021
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Diabetes is a common, chronic condition that affects the body’s ability to control sugar levels. This can be due to autoimmune damage to the pancreas (Type 1 diabetes), or due to decreased effects of insulin (a natural hormone in the body that regulates blood sugar concentrations) due to poor diet, such as in the much more common Type 2 diabetes. Both these types of diabetes are associated with a wide range of complications, such as kidney disease or diabetic eye diseases.
The cause of Type 1 diabetes is not well understood, but is due to both genetic and environmental factors.
Type 2 diabetes is much more common than Type 1. It is more common in men and in people over 35 years old. Rates of Type 2 diabetes are steadily increasing worldwide.
How diabetes affects eye health
In the United States, diabetes is the leading cause of blindness between the ages of 20 and 74. This is because diabetes can damage the tiny, delicate blood vessels that supply the retina at the back of the eye. This can in turn cause damage to the cells of the retina, which are responsible for normal sight. Disrupting normal blood flow to these cells can cause permanent blindness.
This process is called diabetic retinopathy and it is a common complication of all forms of diabetes, particularly if it is not well treated and sugar levels are not well controlled. It is estimated that of all diabetics in the world, approximately one-third of them have some form of diabetic retinopathy. About 10% of diabetics have a level of diabetic retinopathy that is threatening their vision.
In the early form of diabetic retinopathy (called non-proliferative diabetic retinopathy), the blood vessels of the retina start to weaken and can bleed into the retina tissue. This can trigger swelling and damage in nearby tissues, such as the macula. The macula is the central part of the retina that provides our detailed, central vision – any damage to the macula can leave individuals with a permanent black spot in the middle of their vision. This process is called macular oedema. Macular oedema is the number one cause of loss of sight in diabetic retinopathy.
This form diabetic retinopathy can also progress to a more dangerous form, called proliferative diabetic retinopathy. In this form, not enough blood is reaching the cells of the retina and they become deprived of oxygen. In an effort to provide more oxygen, the retina starts to grow new, fragile blood vessels to reach those cells. However, these new blood vessels also have a strong tendency to rupture and bleed, causing further damage to the retina. In extreme cases, these new blood vessels can lead to retinal detachment from the inside of the eyeball altogether, causing blindness.
One of the chief problems in preventing and treating all forms diabetic retinopathy is that you may have no obvious symptoms in the early stages. Unless an eye specialist does a thorough eye examination regularly, diabetic retinopathy may be progressing without you realising it. It is therefore essential that all people with diabetes get regular screening for diabetic retinopathy done by an eye specialist.
Impact of vision loss on quality of life
Blindness is a terrible and destructive complication of diabetes. It can not only have a profound affect on all day-to-day activities, but it has also been shown to have mental health consequences – people with vision-threatening diabetic retinopathy are much more prone to conditions like depression.
While much more research is needed in this area, vision loss due to diabetes can have a wide-ranging, permanent and profound effect on quality of life. Other areas of daily living that can be strongly affected by diabetic retinopathy include reading, driving (especially at night), working, sports, socialising and self-care. People with diabetic retinopathy have reported being much more afraid of having an accident.
Given the terrible lifelong consequences of uncontrolled diabetic retinopathy and its effect on vision, reducing the risk or slowing the progression of the disease is essential for all people with diabetes. People with diabetes should be screened for diabetic eye disease regularly, as well as provided with the best treatment to control their blood sugar levels and blood pressure. This can reduce risk of losing vision by as much as 95%. However, people who have good control of their sugar and blood pressure may still progress to diabetic retinopathy in the long term. Vision loss can be identified early by frequent eye examinations. By treating diabetic retinopathy or macular oedema as early as possible, further progression of the disease can be prevented.
Eye doctors recommend eye examinations every 2 years for people with any form of diabetes. If diabetic retinopathy is diagnosed, patients should be examined even more frequently. People who have a higher risk of progressing to diabetic retinopathy, are those who have poor control of their blood sugar levels or blood pressure and/or have had diabetes for many years should also be screening more regularly.
Treatment for diabetic retinopathy aims to slow the progression of the disease to reduce the risk of macular oedema occurring. This is achieved by controlling blood sugar, blood pressure and cholesterol levels using medication, as well as a eating a healthy diet and getting regular exercise.
Patients with proliferative diabetic retinopathy require more aggressive treatment to stop the growth of new, fragile blood vessels in the retina. This can be achieved using a procedure known as laser photocoagulation. This procedure uses short bursts of laser light fired into the eye at these new, developing vessels to stop them from growing. Laser photocoagulation has been very effective in stopping diabetic retinopathy from progressing to blindness.
In the last few years, the use of a new treatment called anti-vascular endothelial growth factor (anti-VEGF) therapy has also been very successful in treating proliferative diabetic retinopathy. Anti-VEGF drugs are injected into the affected eye and can act directly on these blood vessels to stop them from growing. Often a combination of laser therapy and anti-VEGF therapy is used for diabetic retinopathy or for macular oedema.
In extreme cases, diabetic retinopathy that doesn’t improve with laser photocoagulation therapy may require a surgical procedure on the eye to remove the blood due to these bleeding retinal vessels, called a vitrectomy. This procedure can also allow a detached retina to be repaired.
Source: HEALTH ENGINE
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