As Grateful says, talk to your medics regarding this issue and take their advice.
My grandmother was blind thanks to Diabetes (Not sure whether it was T1 or T2, we have both scattered throughout our family). My aunt was a social worker for the blind in the north west of Ireland and, as a child, I spent many a time attending festivals etc, selling furniture made by the blind to raise money for this charitable work when back in Ireland on holiday back home from London.
I have background retinopathy (like many Diabetics) and was suspected of having maculopathy but the Moorfields eye consultants cleared me of that some years ago.
Every year I have my retinas photographed and I have my sight reviewed by a trusted optician. I suggest that you follow a similar regime. Once your sight is damaged, there is almost no chance of regaining it.
Of all the nasties that Diabetes throws our way, the loss of sight, for me, is the most frightening. Do whatever you can to look after your sight, do your best to maintain your blood sugar levels at the right levels and listen to what your optician and doctors tell you.
Blindness is awful, yet can be avoided.