Blurred vision

Diabetes symptoms sometimes involve your vision. High levels of blood glucose pull fluid from your tissues, including the lenses of your eyes. This affects your ability to focus.

Left untreated, diabetes can cause new blood vessels to form in your retina — the back part of your eye — and damage established vessels. For most people, these early changes don't cause vision problems. However, if these changes progress undetected, they can lead to vision loss and blindness.