I'm afraid I would would be concerned and want to improve matters, as Nicolas says some people are fortunate that the background changes disappear or never progress but this isn't always the case, so if your diabetes control isn't good then improving it will help matters. However just be careful, if bg control is poor and then tightened up too quickly this is known to make retinopathy worse, so any improvements should be done gradually over a longer period, if your not sure speak with your DSN or diabetes consultant about it first.