Originally Posted by

**jaan** I'm having eye surgery next week to correct a long standing problem. Now, talking to my eye doctor he said the chance of success is about 90% per eye. I'm having both eyes done at the same time, and knowing how slippery probability can be something tells me that the success / failure rate might not be 90% / 10% for *both* eyes together.

Assuming the success rate is truly 90% each eye, what is the probability that both eyes will be fixed successfully?

What is the probability that at least one eye will be unsuccessful?

Thank you ahead of time...as you can imagine, this is something that's worrying me a great deal (c: