Ophthalmologist: What They Do & When to See One

An ophthalmologist is a medical doctor (MD or DO) specializing in comprehensive eye and vision care, including medical and surgical treatment of eye diseases and disorders. They are the only eye care providers trained to provide the full spectrum of eye care—from prescribing glasses to performing complex eye surgery.

Education & Training

• 4 years medical school (MD/DO)
• 1 year internship (transitional/preliminary medicine/surgery)
• 3–4 years ophthalmology residency (surgical and medical)
• Optional: 1–2 year fellowship (retina, cornea, glaucoma, pediatrics, oculoplastics, neuro-ophthalmology, uveitis, oncology, refractive surgery)
• Board certification by the American Board of Ophthalmology

Scope of Practice

• Diagnosis & Medical Management: Refractive errors, cataracts, glaucoma, AMD, diabetic retinopathy, uveitis, dry eye, infections, ocular manifestations of systemic disease (diabetes, hypertension, autoimmune).
• Surgical Procedures: Cataract surgery, LASIK/PRK/SMILE, glaucoma surgery (trabeculectomy, tubes, MIGS), retinal surgery (vitrectomy, scleral buckling), corneal transplant, oculoplastic surgery (eyelids, orbit, tear ducts), strabismus surgery, enucleation.
• Emergency Eye Care: Trauma, chemical burns, sudden vision loss, retinal detachment, acute angle-closure glaucoma, orbital cellulitis.
• Prescribing Authority: Topical and systemic medications, glasses, contact lenses.

Ophthalmologist vs. Optometrist vs. Optician

• Ophthalmologist (MD/DO): Medical and surgical eye care. Can treat all eye diseases and perform surgery.
• Optometrist (OD): Primary vision care (exams, glasses/contacts), diagnose/treat many eye diseases (varies by state), pre/post-op co-management. Not surgeons.
• Optician: Fits and dispenses glasses/contacts per prescription; no diagnostic or treatment role.

When to See an Ophthalmologist

• Sudden vision loss, flashes, floaters, curtain over vision (retinal detachment signs).
• Eye injury, chemical exposure, foreign body.
• Chronic systemic conditions: diabetes, hypertension, autoimmune disease (annual dilated exams).
• Diagnosed eye disease requiring medical/surgical management (glaucoma, AMD, cataract, diabetic retinopathy).
• Considering refractive surgery (LASIK, etc.).
• Pediatric eye problems (strabismus, amblyopia, congenital anomalies, leukocoria).
• Complex contact lens fits (keratoconus, post-surgical).

Regular comprehensive eye exams with an ophthalmologist or optometrist are essential for lifelong eye health. For surgical needs or complex medical eye disease, an ophthalmologist is required.