A real estate agent is a term used by many that describe a person or an organization whose business is marketing a real estate to their clients. Either they locate some sellers who hope to sell, or they situate a buyer who wishes to buy.
Optometrists are those who are in a line of work that concerns with the eyes including the vision of the eyes, visual systems. They are the ones who prescribe your glasses, treat eye diseases and vision problems. Although they are not allowed to perform surgery, they are the ones who offer pre or post surgical care to the patients.