I run two Walmart leases right now with close to those #'s. I employee one full time secretary, one PT secretary, and an associate OD part time. Overhead is around 70k a year.
KHE is correct the best money is holding the leases, or owning your own office. I normally see up to three patients an hour. An optometrist would burn out very fast seeing 8/hr. The only way I would consider seeing 8 is to have techs doing retractions, & coming in to do SL exam, DFE's. Similar to Ophthalmology work flow.