Alvaro,
The seller can delete their ad, so eventhough you copy and paste the link, link doesn't work if the ad is delete. Anyway, Rick Staub had post his opinion once on Kingsnake Boa Forum regarding blindness in Albino and Inbreeding. Here's the link
http://forums.kingsnake.com/view.php?id=29386,30100
In my opinion, people just make excuse w/ blind Albino. While I still don't know what's the reason, I have seen a litter of 16 albino babies, 1 out of 16 was blind, and other were not... Just something that Albino breeder has to deal with... Nothing is perfect, you know...