Welcome to HCM.
Sudden onset of visual blurring in your age could be due to problems in your inner layers of eye (vitreous or retina
,involving macula). Since you have not mentioned any discomfort like redness/pain/drooping of eyelids etc..... I think your front half (anterior half) is okay.
Considering your age, I suggest you to consult your eye doctor at the earliest,as conditions like retinal detachment/ retinal vessel occlusions need immediate intervention to save your vision. There are many conditions which will cause sudden blurring of vision like PVD ( posterior vitreous detachment
, central serous retinopathy
, diabetic/hypertensive retinopathy,vitreous hemorrhage
. All the above mentioned conditions can be confirmed only by a dilated retinal examination.
So don't wait, get an appointment and take care:).