An optometrist is a healthcare professional who specializes in the examination, diagnosis, and treatment of vision problems and eye diseases. They work in optometry clinics or optical stores, where they conduct comprehensive eye exams to assess the overall health of the eyes, prescribe corrective lenses such as glasses or contact lenses, and provide treatment for common eye conditions. Optometrists also play a crucial role in identifying systemic diseases that can affect the eyes, and they may refer patients to other healthcare providers for further evaluation or treatment when necessary.