Can High Blood Sugar Cause Blurry Vision?
Medically reviewed by Linda Girgis | MD, Girgis Family Medicine on August 20th, 2026.
Yes, high blood sugar can cause blurry vision by affecting the lens of your eye. When glucose levels rise above normal ranges (typically over 180 mg/dL), excess sugar draws fluid from body tissues, including the eye's lens. This causes the lens to swell and change shape, making it difficult to focus properly. The condition, called diabetic retinopathy, affects approximately 40% of adults with diabetes. Blurry vision from high blood sugar is often reversible when glucose levels return to normal ranges through medication, diet, or insulin therapy. However, chronic high blood sugar can lead to permanent eye damage and vision loss if left untreated.
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