How Old Do Cats Have To Be To Open Their Eyes?

Kittens are able to make a hissing sound even before they open their eyes. They can recognize their mother and humans by the smell, so if they don't recognize the smell of who is near they will sometimes hiss with their mouth opened and even spit—even at one week old.
   
then the eyes open...

Shorthair kittens begin to open their eyes at 5-8 days.

Longhair kittens do not open their eyes until 10-14 days.

Isn't that strange? So if some of your kittens don't have their eyes open yet, but the others do, it may be because they are longhaired. All kittens' eyes are beautiful deep orbs of blue at first. They will look like this until the kittens are three weeks old. Then the iris and pupil will form and the kitten's permanent eye colors will slowly emerge. At first, although the eyes are open, the kittens are still almost completely blind.

Information retrieved from link - KITTEN DEVELOPMENT!

I hope that answers your question.

Usually they don't open their eyes don't start opening around 2 weeks or so.

Mine opened hers/his today at 8 days

Hello to Blurtit! This is my first time here!! Can anyone answer a query that I have about cats? I have seven cats, one spayed Tabby, called Mirror; one all black neutered male, called Magic; one Tortoise-Shell female, called Torty, her four kittens, called Magic, William, Harry and Mia -who are now nine months old.

Mia is a Tortoise-Shell like her mother. The other three are Ginger.

Alas a local Tom-cat, I think a big Ginger Tom-Cat got at the three Ginger females, and possibly Mia too!

One of the Ginger females, Harry just gave birth to four wonderful, healthy, and perfectly formed kittens.

What I want to know is this;  What are the odds of having three breeding Ginger females, as I understood that all are supposed to be sterile!?

Is this true?