Optometrists examine patients' eyes, conducting vision tests and diagnosing and treating sight problems. The main responsibilities of an optometrist include examining patients of all ages to detect vision defects, diseases or injuries; producing reports that detail patients' visual exam histories to supply the best care; providing advice to patients who may need lenses or frames; and writing referrals to other vision specialists when appropriate. Additionally, optometrists may have monthly sales goals designated by his or her employer. Higher-level optometrists may manage staff, as well as communicate with sales representatives from various vision product suppliers to maintain product supply for the company. Optometrist generally work in private practice, such as in eye offices and vision centers; they may also teach at the university level.To become an optometrist, prospective employees must obtain an undergraduate degree in anatomy, biology, chemistry or another relevant field. Then, they must complete optometry school. Some employers may require prospective applicants to obtain a doctorate of optometry, which requires an additional four years of education. Upon completion of the optometry program, applicants must obtain a license in the state in which they wish to practice. To gain a license, applicants must pass a clinical and written examination administered by the National Board of Examiners in Optometry.