This could be neurological reaction to your eye condition changes. The phone sent certain rays, which means that your eye was getting too much light and then you went asleep. Then you went outside and sun was sending harmfull rays to your eyes. If blurry vision has passed. Its that.
It could especially if you are in your late 30's or early 40's I would suggest you see an ophthalmologist as a perfectly healthy eye not in need of glasses it would not be a problem. Find an Eye MD near you at www.aao.org
JCH MD