Registered Nurse:What registered nurse does relies mostly on where they work, for example a pediatric nurse will work with kids wheres geriatric nurse works with elderly patients.
Nurses usually do not work on their own they have a team made up of doctors, nurses aids, and maybe some home health care nurses as well.
Lost of nurses will look over some home heath care nurses, nurse aids, and practical nurses to make sure they are doing their jobs correctly.
Optometrist:An optometrist job is to check your eyes and make sure that everything looks right they are what you call the eye doctor. A lot of people think that all optometrists do is to determine wether you need glasses or not.
They do this, but they do more than just that they may look at your eye if you have a disease, they may also check your eyes if your have an injury.
Doctor: A doctor is called Physician their jobs is to basically help in any way they can mostly what their job consists of is diagnosing and treating illness and injury.