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In page Retinopathy:

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Blood sugar control: If someone has diabetes, or is at high risk for diabetes, it is important for them to have their blood sugar levels checked. The gold standard blood sugar test is the HbA1C test. Many studies have suggested that lowering HbA1C levels in someone with elevated HbA1C levels can lower the incidence and progression of retinopathy. Fortunately, blood sugar control can have benefits beyond just the eye. A primary care physician can help with blood sugar control strategies.[citation needed]