A professional who examines eyes to determine nature and degree of vision problem or eye disease and prescribes corrective lenses or procedures. Responsibilities include:

• Examines eyes and performs various tests to determine visual acuity and perception and to diagnose diseases and other abnormalities, such as glaucoma and color blindness.
• Prescribes eyeglasses, contact lenses, and other vision aids or therapeutic procedures to correct or conserve vision.
• Consults with and refers patients to ophthalmologist or other health care practitioner if additional medical treatment is determined necessary.
• May prescribe medications to treat eye diseases if state laws permit.
• May specialize in type of services provided, such as contact lenses, low vision aids or vision therapy, or in treatment of specific groups, such as children or elderly patients.
• May conduct research, instruct in college or university, act as consultant, or work in public health field.