I did a residency with an Ophthalmology clinic, and it was not out of the question to see 20-40 patients in any given day. However, not all of these patients were refractive cases, only a handful of them were.
Most of the cases were short visits such as post operative follow up exams, glaucoma pressures checks, sometimes just 5-10 minute quick exams with each patient.
Before I would go see these patients, a technician had already worked the patient up with all applicable entrance testing including VAs, EOMs, pupil assessment, refraction (yes, COTs can refract), Goldmann applanation tonometry, and even case history!
I would pop in, say hello, do a quick slit lamp and fundus lens evaluation of posterior segment - then make an assessment and diagnosis and leave. On very busy days, I had a scribe with me to document all of my findings. The clinic was extremely efficient and would see up to 60+ patients in a day. It's definitely possible to see 35-40 patients a day.
Now back to the original poster's statement about doing 35-40 refractions in a day... I think that is just ridiculous! I can't imagine doing this many refractions in an 8 hour day. I would be exaughsted, and I seriously think that patient care would be compromised. I like to trial frame many of my patients and I like to take the case history myself. Refraction for glasses, and especially contact lenses, needs more than just ~15 minutes to be done properly in my opinion. I think i'd go crazy asking "which lens is better, 1 or 2" all day long on 40 different people.
I work for an ophthalmology clinic right now, as do a few of my colleagues. The pay runs between $80-90,000 a year, with full benefits such as medical, dental, association fees, CE fees, paid vacations, etc. It may not be the most amount of money, but it's definitely an interesting place to work. The diversity of patients and unique cases that come in definitely keep my job exciting and challenging. This, and being able to practice to the highest level of optometry (therapeutics and glaucoma management included) make it a great career for me. Any time an especially challenging case comes in we have OMDs to refer to within the clinic for second opinions.
please, don't be just a refraction machine seeing patients every 15 minutes!!