How common is blurred vision in type 2 diabetes?

Changes in blood glucose can alter fluid balance in the lens of the eye, making focus fluctuate. Vision can also be affected by diabetes-related changes in the retina over time. A blurred image may come and go, or it may become more noticeable when glucose is not in your usual range. Because eye symptoms can have several causes, a clinician or eye professional should assess visual changes rather than assuming they are due to diabetes.

Check glucose according to your care plan and take diabetes medicines as prescribed. Record when the blurring occurs and any related symptoms, such as thirst, frequent urination, headache, eye pain, flashes, or floaters. Keep scheduled diabetes and eye appointments, since an eye examination can look for changes that may not be obvious to you. Avoid driving when you cannot see clearly enough to do so safely.

Seek urgent assessment for sudden vision loss, a dark curtain or shadow, new flashes or many floaters, severe eye pain, or a rapid worsening in sight. Emergency help is needed if a visual change comes with facial drooping, weakness, numbness, confusion, trouble speaking, or a severe sudden headache. Contact your usual clinician promptly for persistent or recurrent blurring.

Ask whether your glucose pattern or medicines could be contributing to your changing sight. It may also help to ask when your next eye examination is due, which vision symptoms need urgent action, and who to contact outside usual clinic hours.