Ask an Eye Doctor and Get an Answer ASAP
what is your age? do you wear glasses or contacts?
my initial thought was that perhaps your upclose accomodation was not allowing the eyes to relax and thus experience some midl blurring, but the way you describe it makes me think there may be something subtle in your retina that becomes more apparent when you focus up close. My suggestion is to have a dilated eye exam just to be sure all is normal, Regards XXXXX