Whether good or bad news you will cope with it, only your vet and subsiquent eye specialist will be able to give you a real diagnosis, I don't think I would like to guess though a cataract is an obvious choice, ( which may be able to be operated on) it may even be nothing at all.
My mum's terrier cross has terrible eyes she is under 6, but she copes so well, she is no different, she does not recognise anyone from a distance except for me, but only if I have my hair down :-D her hearing is top notch she still walks and plays the same, she will probably go blind but will be loved and cared for and still live her life more or less as she does now. It is amazing how well we all cope with our animals and their problems.
I hope that you have good news, don't panic! Let us know there are many on this site with eye impaired dogs and plenty of helpful advice if your dog should have problems. Hopefully it is nothing at all. :-) Keep us informed.