The cloudy eye in that young one could have a cataract.  Some ferrets
are genetically inclined to juvenile cataracts, and there is some work
from Australia (by Dr. John Lewington) which will be published on DEWs
and a dietary contribution to cataracts in some of the them.
 
Also check for other possible causes such as glaucoma, injury, etc.
Glaucoma can be painful so calls for meds or eye removal.
 
A corneal injury requires PROMPT medical care.
 
The good thing is that ferrets do not usually mind losing their sight.
They are far more oriented to the other senses.
 
"Scent mapping" info is in both the FML and FHL Archives in case sight
is fully lost or greatly compromised.  We have done that for ages --
something around 2 decades or more since the first modest version, I
suspect -- with excellent results.
 
You can find some ferret vet listings in the resources here and
elsewhere:
http://ferrethealth.org/archive/browse.php?msg=SG15794
 
-- Sukie (not a vet)
Ferret Health List co-moderator
http://www.smartgroups.com/groups/ferrethealth
FHL Archives fan
http://ferrethealth.org/archive/
replacing
http://fhl.sonic-weasel.org
International Ferret Congress advisor
http://www.ferretcongress.org
[Posted in FML issue 5099]