My days without anesthesia are slightly slower surgically, but the PACU nurses are much happier and the patient is out the door much quicker. Patients don't have to fast, they don't need an IV, and overall, they rave about it. I very rarely have to abort and can usually tell while draping. You could get an IV on everyone in case you need to add nurse administered drugs, but using oral versed or an MKO melt is fantastic. Our ASC is attached, but I would certainly consider office-based surgery otherwise.
Retina without anesthesia would be much more difficult given longer cases and increased need for an immobile patient.
My days with anesthesia are more profitable to the ASC. 30-35 cases bring about $4k in anesthesia collections, while my non-anesthesia days have additional cost (one extra nurse + the drugs) without any collections beyond the cataract bundle.