alan , I don't want to scare you but my mom had a lot of trouble with the cataract surgery she had. She did have diabetes & that may have been part of the troubles.
Her vision was worse after the surgery than before. She had both eyes done at once.
My advice would be to do one eye at a time & let it heal completely.
See how it goes so to speak.
I think both eyes at once is easier for the doctor & makes them more money.
IMHO it is not best for the patient.