Which eye condition can be directly caused by diabetes?

Cataracts are a significant eye condition that can be directly influenced by diabetes. High blood sugar levels associated with diabetes can lead to changes in the eye lens, causing it to swell and eventually leading to the formation of cataracts. This condition results in cloudiness of the lens, impairing vision over time.

While astigmatism is primarily related to the shape of the cornea and is not a direct outcome of diabetes, and glaucoma, which involves increased pressure in the eye, can also be associated with diabetes, these connections are more complex and not as directly correlated as cataracts. Myopia, or nearsightedness, primarily stems from the eye's physical shape rather than metabolic conditions like diabetes. Thus, cataracts stand out as the eye condition most directly caused by diabetes due to the physiological effects of the disease on the lens of the eye.