I was recently discharged from an NHS Opthamology department (satisfyingly my peripheral vision has improved). I mentioned that I am still bothered by quite blurry vision some days - the Consultant said this is due to dry eyes (pre-dated Interferon treatment, but obvs one to keep an eye on, no pun intended).
She gave me some eye drops (thick and more like a gel) to apply before going to sleep. I've only used them a few times but am really impressed by how much difference they are making. I thought I'd mention in case it helps someone else - in the UK these are Viscotears 2mg/g Carbomer (apparently you can buy them so I'm off to find out where).
Mazcd - if you're not allowed to post a specific product on here please remove this; I'm in no way affiliated, it's just something that I've found helpful. There are other eye drops!