[madengr]

You mean physician. An optometrist typically has a Doctor of Optometry degree. One can argue if that's really a Dr. (I'd say it more like an MS), but nonetheless they could be called Dr. They also write prescriptions for lenses.

An optician fits the glasses, which is more like the technician.

[opo]

An optometry program lasts four years, so that is equivalent to the schooling needed for an MD. (After schooling there is a state and national examination in order to get the license.)