> We have a Persian of unknown age who has developed a dark spot on his
> right eye, not opaque, slightly off-center and perhaps a quarter inch
> in diameter.  A week or so ago, he kept this eye closed for a few
> days.  There was no such darkening before then.  We will take him to
> the vet if it persists, but does anyone have a thought as to what it
> could be?