Hi I have been diet controlled type 2 for 3 years. just put onto metformin 500mg x 2 per day, 21st dec 2017. coping with many of the side effects but after about 5 days on meformin, I now have blurred vision. My practice nurse said it is probably caused by my high blood sugar levels. But seems a coincidence that after 5 days i now have blurred vision. have read on some websites, it is because my blood sugars have been so high for so long my eyes have adjusted, now on metformin it is bringing my sugars down and my eyes cannot cope with the drop in sugars, this was backed up by DRS nurse. Anyone else suffer from this and if so is it temp.