My sister is having cataracts surgery next week

My sister is having cataracts surgery next week
 

I we want to paraphrase this sentence with operated how can I say it.
My sister is going to be operated on catarats next week.
My sister is going to have a cataracts operation next week.
Are these correct?
If not how do we use to be operated on?

"My sister is going to be operated on for cataracts next week."

Or "My sister is going to have a cataract* operation next week."

* Sing.