An area of expertise in medical subjects such as radiology or anthropology.
A field is an isolated area of treatmnet. A sugical field is the part draped. Where the central part must be exposed for sugery.
The answer varies from state to state. In NY, medical assistants can't administer medications, assess patients, or give injections. They can take vitals and provide other types of services.
Doctor of Optometry (which is an eye doctor) or right eye
It is part of human nature to help those who are hurt or sick. The medical field is just an extension of that.