An OD is a Doctor of Optometry, an eye care specialist who examines, diagnoses, and treats conditions affecting your eyes and vision. ODs are not medical doctors (MDs), but they complete a rigorous four-year doctoral program focused specifically on the eyes after earning an undergraduate degree.
What ODs Are Trained to Do
Optometry school is a four-year program covering ten semesters of coursework and hands-on clinical training. By the time they graduate, OD students have directly examined roughly 1,800 patients. The curriculum covers eye anatomy, disease, optics, pharmacology, and the full range of diagnostic and treatment skills needed to manage eye health independently.
After graduation, some ODs pursue an additional year-long residency to specialize in areas like pediatrics, ocular disease, low vision rehabilitation, contact lenses, or binocular vision. Others go straight into practice as general eye care providers.
Conditions an OD Can Diagnose and Treat
ODs do far more than write prescriptions for glasses and contacts. They diagnose and manage a wide range of eye diseases, including glaucoma, macular degeneration, diabetic eye disease, cataracts, dry eye, and corneal ulcers. If you show up with red painful eyes, sudden vision loss, flashes of light, or floaters, an optometrist can evaluate the problem, determine the cause, and in many cases prescribe medication or other treatment on the spot.
Modern optometry offices use advanced imaging technology to see inside your eye in remarkable detail. One common tool, optical coherence tomography (OCT), uses infrared light to create cross-sectional images of the retina and optic nerve, layer by layer. This lets an OD detect early signs of conditions like retinal tears, macular edema, and even eye cancer before you notice any symptoms.
Some ODs also provide vision therapy and neuro-optometric rehabilitation for people recovering from concussions, strokes, or brain injuries. These services address problems with eye tracking, double vision, and visual processing that often follow neurological events. Care is typically coordinated with occupational, physical, and speech therapists.
Surgical Privileges Vary by State
Whether an OD can perform surgical or laser procedures depends on where they practice. States like Alaska, Colorado, Indiana, Kentucky, Louisiana, and Oklahoma grant optometrists authority to perform laser procedures such as capsulotomy, peripheral iridotomy, and trabeculoplasty. Other states, including Georgia, Idaho, Oregon, and Tennessee, allow ODs to remove small lumps and bumps from the eyelid and surrounding tissue. Some states limit optometrists to non-surgical treatment only. The trend over the past decade has been toward expanding what ODs are authorized to do.
OD vs. Ophthalmologist vs. Optician
These three titles sound similar but represent very different levels of training and scope.
- OD (Optometrist): Completes a four-year doctoral program in optometry. Provides comprehensive eye exams, prescribes glasses and contacts, diagnoses eye diseases, and prescribes medications. Can perform certain surgical and laser procedures depending on the state.
- Ophthalmologist (MD or DO): A medical doctor who completes medical school plus a multi-year surgical residency focused on the eyes. Can perform all eye surgeries, including cataract removal, retinal repair, and LASIK. Treats the full spectrum of eye disease.
- Optician: Not a doctor. Fills prescriptions written by an OD or ophthalmologist, helps you select frames, fits glasses, and adjusts contacts. Does not examine eyes or prescribe medication.
For routine eye care, disease screening, and ongoing management of conditions like glaucoma or dry eye, most people see an OD as their primary eye care provider. If you need eye surgery or have a complex condition requiring surgical intervention, an OD will refer you to an ophthalmologist.
How Often to See an OD
The American Optometric Association recommends that infants have their first eye exam between 6 and 12 months of age. Children should be examined at least once between ages 3 and 5, then before first grade and every year after that. Adults ages 18 to 64 with no risk factors should go at least every two years. Once you hit 65, annual exams are recommended for everyone. If you have diabetes, a family history of glaucoma, or other risk factors, annual exams are recommended regardless of age.
These visits go well beyond checking whether you need a new glasses prescription. A comprehensive eye exam can reveal early signs of systemic conditions like diabetes and high blood pressure, since the blood vessels in your retina are among the few that can be observed directly without surgery.