An optometrist is a doctor of optometry (O.D.) who serves as a primary eye health care provider, trained to examine, diagnose, treat, and manage diseases and disorders of the eye. Optometrists provide more than two-thirds of all primary eye care in the United States and are recognized as physicians under Medicare. They are not the same as ophthalmologists or opticians, though the three titles are easy to confuse.
What an Optometrist Does
Optometrists are the professionals most people see for routine eye care. They test your vision, prescribe glasses and contact lenses, screen for eye diseases like glaucoma and macular degeneration, and treat many common eye conditions with medication. They can also detect systemic diseases that show up in the eyes, including diabetes, high blood pressure, and autoimmune conditions, sometimes before you have symptoms elsewhere in the body.
Depending on the state, optometrists can prescribe a range of medications for eye-related conditions: antibiotic and anti-inflammatory eye drops, oral pain relievers, and in some states, certain controlled substances like hydrocodone combinations for short-term pain relief (often limited to a 72-hour or five-day supply). They can also administer vaccinations.
In certain states, the scope has expanded to include specific laser and minor surgical procedures. California, for example, now allows certified optometrists to perform laser treatments for glaucoma, laser procedures after cataract surgery, removal of small noncancerous lesions near the eye, corneal foreign body removal, and tear duct procedures like punctal plug placement and lacrimal irrigation. These expanded surgical privileges vary significantly from state to state.
Education and Training
Becoming an optometrist takes a minimum of seven to eight years of higher education. The path starts with a bachelor’s degree (some programs accept three years of undergraduate coursework), followed by a four-year doctoral program at an accredited college of optometry. The first two years of optometry school focus on the science of eye health, pharmacology, and the clinical procedures optometrists may perform. The final two years shift to hands-on training: learning to conduct eye exams, fit corrective lenses, and treat eye diseases and disorders. At some schools, the entire fourth year is spent in clinical rotations.
After graduating with an O.D. degree, a small number of optometrists pursue an additional one-year residency to gain more experience with complex eye diseases. All practicing optometrists must pass a licensing exam, and maintaining certification through the American Board of Optometry requires 100 hours of continuing education and passing at least 7 out of 9 mini-assessments during each four-year certification cycle.
Optometrist vs. Ophthalmologist
This is the distinction that trips most people up. An ophthalmologist attends four years of medical school (earning an M.D. or D.O.), then completes a residency specifically focused on eye and vision care, including surgery. That residency is where they learn to perform operations like cataract removal, retinal repair, and LASIK. Some ophthalmologists subspecialize even further in areas like pediatric eye surgery, glaucoma surgery, or retina surgery.
An optometrist attends four years of optometry school (earning an O.D.) rather than medical school. They can diagnose and medically treat many of the same conditions an ophthalmologist handles, but their surgical scope is far more limited. If you need a major eye surgery, you will be referred to an ophthalmologist. For routine vision care, disease screening, managing chronic conditions like dry eye or early-stage glaucoma, and prescribing corrective lenses, an optometrist handles all of it.
In practical terms, your optometrist is typically the first professional you see for eye health. They refer you to an ophthalmologist when a condition requires surgical intervention or falls outside their scope.
Optometrist vs. Optician
An optician is not a doctor. Opticians are technicians who fill your lens prescription, fit your glasses or contact lenses, and make sure your frames sit correctly. They do not examine eyes, diagnose conditions, or prescribe medications. Think of the relationship like a pharmacist and a physician: the optometrist writes the prescription, and the optician helps you get the right product.
Specialty Areas
All optometrists graduate as primary eye care providers, but many develop focused expertise. Common specialties include pediatric eye care (working with children who have learning disabilities or developmental challenges), geriatric optometry, sports vision, low vision rehabilitation for people with significant sight loss, contact lens fitting for complex cases, and neuro-optometry for patients recovering from brain injuries or stroke. Optometrists also frequently serve as post-operative care providers following cataract and refractive surgeries, managing healing and recovery while the ophthalmologist who performed the surgery steps back.
What Happens During an Eye Exam
A comprehensive exam with an optometrist covers far more ground than reading letters on a wall chart. It typically starts with a detailed health history: your current symptoms, medications, work and environmental conditions that affect your eyes, and your family’s history of eye disease.
From there, the exam moves through a series of assessments. Visual acuity testing measures how clearly each eye sees at various distances. Preliminary screening checks depth perception, color vision, peripheral vision, eye muscle coordination, and how your pupils respond to light. Keratometry maps the curvature of your cornea by reflecting a circle of light off its surface, which is important for contact lens fitting and detecting conditions like astigmatism.
Refraction is the part most people recognize: you look through a series of lenses while the optometrist narrows down the prescription that gives you the sharpest vision. You’ll hear “which is better, one or two?” repeatedly during this step. The optometrist also evaluates how well your eyes focus, track moving objects, and work together as a pair.
The eye health evaluation is arguably the most medically important part. Using specialized microscopes, imaging technology, and sometimes dilating drops to widen your pupils, the optometrist examines the internal structures of your eye, including the retina, optic nerve, and blood vessels. Eye pressure is measured to screen for glaucoma. This is also where signs of diabetes, high blood pressure, and other conditions outside the eye can show up. Additional testing may follow if anything looks unusual or needs a closer look.