Overview of progression
Diabetic retinopathy progresses gradually as a result of ongoing effects of diabetes on the retinal microvasculature. These changes occur over time and may initially be subtle, becoming more extensive as the condition advances.
Staging is based on the degree of blood vessel damage, the extent of retinal involvement and the presence of more advanced structural changes.
Non-proliferative diabetic retinopathy (NPDR)
Non-proliferative diabetic retinopathy represents the earlier stages of the condition and is characterised by progressive damage to the small blood vessels within the retina.
These vessels may become weakened, leak fluid or become partially blocked, affecting the stability of the retinal environment.
Mild NPDR
In mild NPDR, small changes begin to develop within the retinal blood vessels. These may include tiny areas of vessel wall weakness and minimal leakage.
At this stage, visual function is usually unaffected, and changes are typically detected during routine examination.
Moderate NPDR
As the condition progresses to moderate NPDR, changes become more widespread. Blood vessel damage increases, and there may be greater disruption to normal retinal circulation.
Although vision may still appear stable, the underlying retinal environment becomes more compromised.
Severe NPDR
Severe NPDR is characterised by significant disruption of retinal blood flow. Larger areas of the retina may be affected by reduced circulation, increasing the risk of progression to more advanced stages.
At this stage, the retina is under greater stress due to inadequate oxygen supply.
Describes the occurrence of Non-Proliferative Diabetic Retinopathy when high-blood sugar damages small blood vessels within the retina, leading to edema, and blurred vision.Proliferative diabetic retinopathy (PDR)
Proliferative diabetic retinopathy represents a more advanced stage of the condition. It develops when the retina responds to reduced blood supply by forming new blood vessels.
These new vessels are abnormal and fragile, and they can affect the stability of the retina.
The presence of these vessels indicates a more advanced level of retinal involvement and a higher risk of further complications.
Shows how blood vessels growing abnormally from the retina into the vitreous lead to Proliferative Diabetic Retinopathy (PDR), requiring immediate treatment.Transition between stages
Progression from NPDR to PDR does not occur at a fixed rate. Some individuals may remain in earlier stages for extended periods, while others may progress more rapidly.
Factors such as overall diabetic control and systemic health can influence how quickly these changes occur.
Retinal environment changes
As diabetic retinopathy progresses, the retinal environment becomes increasingly unstable. Changes in blood flow, oxygen supply and fluid balance contribute to the structural and functional alterations seen at each stage.
These changes affect how the retina processes visual information.
Relationship between staging and vision
Earlier stages of diabetic retinopathy often do not significantly affect vision, which is why the condition may go unnoticed without examination.
As the condition advances, the likelihood of visual impairment increases, particularly if central retinal areas become involved.
Importance of staging in clinical care
Identifying the stage of diabetic retinopathy is essential in guiding monitoring and management. It helps determine how frequently assessments are required and when intervention may become necessary.
Staging provides a framework for tracking progression over time.
Role of regular monitoring
Because progression can occur without symptoms, regular retinal assessment is essential. Monitoring allows for early detection of changes and timely adjustments in care.
This video helps people with diabetes understand why it’s extra important for them to get regular eye check ups. We appreciate the help of Christina Curran of Tidewater Eye for suggesting this video and Dr. Steve Wilson of Wilson Eyecare Associates who had valuable feedback.