Does type 2 diabetes cause blurred vision?

Blur that changes as glucose changes may improve when glucose is brought into the target range, but vision should not be adjusted through self-treatment. Ongoing or recurring blur needs a clinician or eye professional to check the eyes and glucose. A sudden change in sight is different from gradual blur and should be treated as urgent.

Book a timely assessment for new or persistent blurred vision. A clinician may check glucose, blood pressure and the eyes, then arrange a dilated retinal examination when appropriate. Avoid driving if vision is not clear enough to see safely. Bring a list of medicines and note whether the blur affects one or both eyes, varies during the day or comes with pain.

Seek emergency assessment for sudden vision loss, a curtain or shadow, new flashes, a sudden shower of floaters, severe eye pain, marked redness, weakness or trouble speaking. These signs can reflect an eye or neurological emergency and should not wait for a routine diabetes appointment.

Ask whether the blur may be related to glucose, whether you need an eye examination, and how to monitor changes safely. Discuss warning signs, driving, medication effects and the schedule for future retinal checks if diabetes is diagnosed.