Visual problems
There’s an overall change in the proportion and concentration of liquid in different tissues, including the eye. In early diabetes, high blood glucose affects the lens of the eye, a particular structure that changes its thickness according to the images we are seeing to focus the image and get a clear view. When blood glucose is high, the lens starts absorbing fluid and swelling up, changing its thickness. Thus, patients with an early onset of diabetes typically experience blurry vision as the structure of the lens changes.
This type of blurry vision is reversible when blood sugar levels go back to normal, but throughout the disease, it is possible to experience serious eye problems that might not go back to normal. Diabetes usually affects the retina, a special layer of the eye with nervous cells transmitting visual images to the brain. However, these are a late manifestation of diabetes, and one of the most common complications.