Hi
@sarah k,
It may be important to find out exactly what the eye specialist thinks is the cause of your eye problems.
It could be the diabetes but maybe there are other factors like ? blood pressure etc etc.
Until you and your other doctors have a better idea of what is causing what it is difficult to pin point what may help your eyes or at least slow down any progression, there it is going to be difficult to know what to do.
Diabetes-wise i sense
losing weight is a battle for you. In addition to the low carb diets etc ( and ensuring in that diet you are taking in sufficient protein, minerals and vitamins etc - something a
dietician could help you with), Metformin may be of help to some (as
@Rachox points out above).
Another 'tack' may be to think about
'bowel bugs". - Think for a moment about making yoghurt - you take milk, heat it, add 'bugs' of a certain type and then enjoy the product. If the incorrect 'bugs' are used the results are something that looks and tastes vile and is unlikely to be healthy.
So it has been shown that the 'right' bowel bugs improve diabetes and wrong ones make it worse. Sources of foods reputed to have good bowel bugs ( these foods are collectively called 'pro-biotics') include live culture yoghurt, sauerkraut, tempeh (the refrigerated variety is low in salt) as examples and the food for these 'probiotics are called 'pre-biotics' and include onion, garlic and the like, berries and honey (both In moderation) dark chocolate, Jerusalem and other artichokes, apples (in moderation) etc.
You should of course check such additions to your diet out with your doctor/nurse,/dietitian.
I do hope you find ways to improve your health and what forum members have provided is all of help.
You might, on the basis of your eye troubles, be eligible for a glucose meter to measure your blood sugar levels. If so, or you find a cheap reliable model to purchase (others on here know the best brands) and you take advice about WHEN is/are the best time(s) to check your blood sugars, that might help you with what foods etc suit you best.
With HBA1C - that is a measurement of the amount of sugar in your blood which accumulates on the haemoglobin - a natural substance in our blood cells which makes blood red. ( do not know how royals are supposed to have blue blood - that is beyond my (retired) pay grade !!!). The higher the amount of sugar in the blood over the life of a red blood cell, which is about 100 days, the higher the HBA1C reading BUT if one's blood sugar has been yo-yoing say from between 4.0 mmol/l and 12 mmol/l the average over the 3 month ( = approx. 100 days) may well be about 8 to 9 mmol/l) The question is whether it is the levels above say 9 mmol/l (among other things) which might over time be affecting your eye health.
The level of 46 to 48 you quoted are probably your HBA1C test results as they report these in different ways to blood sugar levels. See what your doctor says is the ideal target level for you.
Best Wishes !!