Optometry is a career that involves examining eyes to detect vision defects, injuries, diseases or other abnormalities. Optometrists are trained to perform health assessments, offer clinical advice, prescribe corrective lenses and refer patients to specialists when needed. Optometry school encompasses four years of rigorous study including optics, physiology, anatomy, pharmacology, eye disease, refraction techniques and clinical examination skills. After becoming an optometrist, there are opportunities to work for multinational companies, own an optometry practice, teach, or start an optical shop.