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Blurry vision can occur with both low blood sugar (hypoglycemia) and high blood sugar (hyperglycemia). While temporary blurry vision from these fluctuations usually resolves when blood sugar levels stabilize, consistently high blood sugar can lead to long-term complications like diabetic retinopathy or diabetic macular Show Full Answer
@A DiabetesTeam Member toss a coin - both low (hypo) and high (hyper) blood sugar can cause blurry vision
However, in the overwhelming majority of incidence it's High Blood Sugar that will cause blurred vision
If low blood sugar is the cause you are almost always experiencing the more common "low" effects - cold sweats, disoriented, shaking - when blurred vision gets in on the party you are not too far away from losing consciousness
Higher blood sugar over the course of the disease leads to Retinopathy, Diabetic Macular Degeneration and increases the risk of cataracts
(anytime our sugar levels remain higher than 8.7 mmols/157 points for longer than an hour it starts to damage our microvascular system which includes the small blood vessels in the Eyes, Kidney's and Brain which can ultimately lead to blindness, end stage kidney disease, or Diabetic Dementia - none of which can be reversed and at best, all treatment can do is slow down the progression a little - the blood sugar "destroys" the vessels and they can't heal or regenerate so they must be protected)
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