An optometrist is a healthcare provider who specializes in examining eyes, diagnosing vision problems, prescribing corrective lenses, and managing a range of eye diseases. They hold a Doctor of Optometry (OD) degree and serve as the primary point of contact for routine eye care for most people. If you’ve ever had your vision checked and walked out with a glasses or contact lens prescription, you almost certainly saw an optometrist.
What Optometrists Do
The core of an optometrist’s work is examining the eye for vision problems and prescribing corrective lenses, whether glasses or contacts. But the role extends well beyond reading an eye chart. Optometrists examine, diagnose, treat, and manage disorders of the eye and visual system. That includes common conditions like nearsightedness, farsightedness, and astigmatism, as well as eye diseases such as glaucoma, cataracts, dry eye, macular degeneration, and diabetic retinopathy.
During a comprehensive eye exam, an optometrist uses several specialized instruments. A phoropter is the device you look through while the doctor flips between lenses and asks “which is clearer, one or two?” A slit lamp is a high-powered microscope with a bright light that lets the doctor examine the front structures of your eye in fine detail. A tonometer measures the pressure inside your eye, which is a key screening tool for glaucoma. They may also use an ophthalmoscope to look at the retina and optic nerve at the back of your eye, and a keratometer to measure the curvature of your cornea.
Optometrists are licensed to prescribe medications for eye conditions. The specifics vary by state, but in general they can prescribe topical eye drops (like antibiotics for pink eye or drops to lower eye pressure in glaucoma) and certain oral medications related to eye conditions. Some states limit prescribing authority to topical drugs, while others allow a broader range of oral medications. A handful of states have recently begun authorizing optometrists to perform certain laser procedures as well. Montana, for example, passed legislation in 2025 allowing licensed optometrists to perform laser surgical procedures after completing a 32-hour certification course.
Education and Training
Becoming an optometrist requires a four-year Doctor of Optometry (OD) program, typically entered after completing a bachelor’s degree. Some programs admit students with three years of undergraduate coursework, making it possible to earn both a bachelor’s degree and an OD in seven years total through combined programs. Optometry school does not require a bachelor’s degree uniformly across all schools, but most admitted students have one.
The four-year optometry curriculum covers optics, contact lens fitting, vision sciences, vision therapy, practice management, and coursework in basic medical sciences and eye diseases. After graduating, optometrists must pass the licensing exam administered by the National Board of Examiners in Optometry before they can practice. There is no mandatory postgraduate residency, though optional residency programs exist for those who want to specialize.
Optometrist vs. Ophthalmologist
This is the distinction most people are curious about. An ophthalmologist is a medical doctor (MD or DO) who completed four years of medical school, a one-year internship, and a three-year ophthalmology residency. That adds up to at least eight years of postgraduate training, compared to four for an optometrist. Ophthalmologists are trained to perform eye surgery, including procedures like cataract removal, LASIK, and retinal repair. They also manage complex or systemic diseases that affect the eyes.
An optometrist provides primary eye care and nonsurgical management of eye conditions. Think of it like the difference between your primary care doctor and a surgeon. For routine eye exams, glasses prescriptions, contact lens fittings, dry eye treatment, or monitoring early-stage glaucoma, an optometrist handles all of that. If you need surgery or have a complicated condition involving other body systems, you’ll typically be referred to an ophthalmologist. Medical students rotate through multiple specialties and gain experience managing patients with different systemic diseases, which is training optometrists don’t receive.
Optometrist vs. Optician
An optician is not a doctor and does not examine eyes or prescribe medication. Opticians take the prescription written by an optometrist or ophthalmologist and help you select the right frames, fit your glasses, and adjust them so they sit properly on your face. They also fit contact lenses based on a prescription. If you need an actual eye exam or treatment for an eye condition, you need an optometrist or ophthalmologist, not an optician.
Subspecialties in Optometry
Optometrists who want advanced training can pursue optional residency programs, typically lasting one year. Pediatric optometry focuses on assessing and treating eye and vision conditions in children, including lazy eye and crossed eyes. Cornea and contact lens specialists work with patients who have complex corneal conditions or need advanced contact lens fittings, such as scleral lenses for irregular corneas. Other areas of focused practice include low vision rehabilitation (helping people with significant, uncorrectable vision loss make the most of their remaining sight), neuro-optometry, and ocular disease management.
How Often You Should Get an Eye Exam
The American Optometric Association recommends a first eye exam for infants between 6 and 12 months of age. Children should have at least one exam between ages 3 and 5, then an exam before first grade and annually after that. These early exams matter because children rarely complain about blurry vision if they’ve never known anything different, and undetected problems like amblyopia (lazy eye) are far easier to correct when caught young.
For adults without symptoms or risk factors, a comprehensive exam every one to two years is a common guideline, with annual exams becoming more important after age 60, when the risk of cataracts, glaucoma, and macular degeneration rises sharply. If you have diabetes, a family history of eye disease, or wear contact lenses, annual exams are particularly important regardless of your age. Even if your vision feels fine, a comprehensive eye exam can catch conditions like glaucoma that cause no symptoms until significant damage has already occurred.