My cat is FIV positive...several days ago one of his pupils became dilated..it looks twice as big as the other eye. I took him to the vet, she found nothing wrong, did lab work..then i saw your forum about FIV postive cat..How is FIV causing the diluted pupil..., he is in no pain..I'm sure it's not glaucoma..and it is not cataracts. he can see...