I don't know if this helps any, but I found some resouces on FIP:

http://www.vet.cornell.edu/fhc/brochures/fip.html

http://www.newmanveterinary.com/fip.html

http://www.peteducation.com/article....&articleid=212

Information on eye problems in cats:

http://hubpages.com/hub/Cat-Eye-Problems

http://www.petmedsonline.org/cat-eye-health.html


Have you asked your vet about FIP? How long have your other cats been exposed to this one with the recent eye issues? If not long, consider seperating them - different food bowls, water bowls, and litter, till you have a better understanding of whats going on