An Optometrist has the job of sorting out people’s eye problems by prescribing the best type of glasses to aid their vision. By conducting a whole bunch or rigorous tests with some really cool equipment you will be able understand exactly what state of condition a patient's vision and eye hygiene is in.
The YouTube clip: The explanation of the Three O’s in Eye Care.
Also check out the FirstStep.me University Guide for institutions that offer a degree/qualification in this field. Along with the FirstStep.me breakdown of employment websites for industry opportunities.