I heard somewhere that moving along the metabolic disease path from pre-diabetic to diabetic can cause structural deformation of the eye lens rather dramatical

I heard somewhere that moving along the metabolic disease path from pre-diabetic to diabetic can cause structural deformation of the eye lens rather dramatically due to increased blood sugar content and can be the cause of a symptom like, "I woke up one morning and couldn't read." Anyways, worth looking at diabetic markers in that age range even if my previous sentence is bunk.