I am assuming he is mentioning about "cotton wool" spots. When you have uncontrolled diabetes
you develop what is called diabetic retinopathy
which is basically due to damage to the blood vessels that supply the part of the eye that captures vision(called as retina
There are two types of damage:Both can occur without symptoms, like in your case.
1.Proliferative retinopathy: abnormal blood vessels proliferate and over a period of time causes damage to normal parts. there are 4 stages in terms of severity. If it's upto stage 3 u don't need laser treatment
2. Macular edema: causes blurring of vision. You need laser treatment if macula is involved.
In either case you need eye examination once a year and tight control of your blood sugar. Also if your eyes are getting retinopathy, it's time to check your urine albumin
because you are at high risk of nephropathy which means your kidney cells might be starting to get damaged too. For that you need to do a Spot albumin/cr ratio and if it is increased you might need treatment for that.