Hi,
First of all Fuchs endothelial dystrophy is a bilateral condition ie. it affects both eyes. It is a relatively common condition, it usually presents in later years and is a slowly progressive condition which involves the back surface of the cornea, the clear structure at the front of the eye.
As this progresses those with the condition can experience a variety of symptoms from mild blurring which is often worse on waking to painful eyes with reduced vision. However this usually a very slow process.
Fuchs is not something that be cured as such but can be managed from treating with something as simple as eye ointments but some do need surgical treatment.
The most common problem with Fuchs is that it can cause problems with cataract surgery and given that Fuchs is a condition that is usually seen in older people this is usually the most common complication with Fuchs.
The thing that you have to remember is that just because your wife may have fuchs is that it may be in its early stage and not actually be the cause of any of your wife's symptoms. It certainly has nothing to do with the floaters and there are so many minor problems that can cause the mild blurring or misting that it could be something as simple as dry eyes or mild cataract.
Relax, wait until you see the consultant and ask as many pertinent questions at your appointment.
Hope all goes ok.