Ophthalmology — Find Specialists & Top Hospitals Worldwide | MyMedicPlus

Ophthalmology is the medical and surgical specialty concerned with the comprehensive care of the eye, visual system, and surrounding orbital structures. Ophthalmologists are unique among medical specialists in that they are both physicians and surgeons — trained to diagnose and manage a vast range of ocular conditions medically, and to perform intricate surgical procedures when intervention is needed.

The eye is a complex sensory organ whose health is intertwined with systemic conditions including diabetes, hypertension, autoimmune disease, and neurological disorders. Ophthalmologists therefore serve as important diagnostic windows into systemic health, frequently detecting diseases through their ocular manifestations before they are diagnosed elsewhere.

Ophthalmology encompasses several subspecialties. Retinal specialists manage diseases of the retina including diabetic retinopathy, age-related macular degeneration (AMD), and retinal detachment, and perform complex vitreoretinal surgery. Cornea and external disease specialists treat corneal infections, dystrophies, and perform corneal transplantation. Glaucoma specialists manage the group of diseases damaging the optic nerve through elevated intraocular pressure. Paediatric ophthalmologists treat amblyopia (lazy eye), strabismus (squint), and congenital eye conditions in children. Neuro-ophthalmologists manage visual pathway disorders caused by neurological disease. Oculoplastic surgeons reconstruct the eyelids, orbit, and lacrimal system. Refractive surgeons perform laser vision correction and lens-based refractive procedures.

Ophthalmologists diagnose and treat the full spectrum of eye diseases and visual disorders:

• Cataract: Progressive clouding of the natural crystalline lens causing gradually worsening vision, treated with phacoemulsification surgery and intraocular lens (IOL) implantation.
• Glaucoma: A group of conditions damaging the optic nerve — usually from elevated intraocular pressure — leading to irreversible peripheral and eventually central vision loss.
• Age-related macular degeneration (AMD): Degeneration of the central retina (macula) causing central vision loss; wet AMD is treated with intravitreal anti-VEGF injections (ranibizumab, aflibercept).
• Diabetic retinopathy: Damage to retinal blood vessels from diabetes, ranging from background retinopathy to vision-threatening diabetic macular oedema and proliferative retinopathy.
• Retinal detachment: Separation of the retina from the underlying pigment epithelium, a surgical emergency requiring urgent vitreoretinal surgery.
• Corneal diseases: Including keratoconus (progressive corneal thinning), Fuchs endothelial dystrophy, and infectious keratitis requiring antifungal or antiviral treatment.
• Dry eye syndrome: Chronic inadequacy of tear film quality or quantity causing surface inflammation and discomfort, managed with lubricants, cyclosporine drops, and punctal plugs.
• Uveitis: Intraocular inflammation affecting the uveal tract; may be infectious or autoimmune in origin and can lead to glaucoma and cataract if poorly controlled.
• Amblyopia (lazy eye): Reduced visual acuity in one eye due to abnormal visual development in early childhood, treated with patching and corrective lenses.
• Strabismus (squint): Misalignment of the eyes due to extraocular muscle imbalance, managed with glasses, patching, and surgical correction.
• Refractive errors: Myopia (short-sightedness), hyperopia (far-sightedness), astigmatism, and presbyopia corrected with spectacles, contact lenses, or refractive surgery.

Ophthalmologists perform a wide range of diagnostic tests and surgical interventions:

• Slit-lamp biomicroscopy: Detailed examination of the anterior segment (cornea, iris, lens) and posterior segment (retina, optic nerve) using a high-powered binocular microscope.
• Visual field testing (perimetry): Automated measurement of the peripheral visual field to detect and monitor glaucoma, neurological visual deficits, and retinal disease.
• Optical coherence tomography (OCT): High-resolution cross-sectional imaging of the retina, optic nerve, and cornea, essential for monitoring macular degeneration and glaucoma progression.
• Fluorescein angiography: Injection of fluorescent dye to image retinal blood vessels, detecting leakage in diabetic retinopathy and AMD.
• Phacoemulsification cataract surgery: Ultrasonic emulsification of the cloudy lens through a small incision, followed by foldable IOL implantation; the world's most common elective surgical procedure.
• Intravitreal injection therapy: Injecting anti-VEGF medications (ranibizumab, aflibercept, bevacizumab) directly into the vitreous cavity to treat wet AMD and diabetic macular oedema.
• Trabeculectomy and minimally invasive glaucoma surgery (MIGS): Surgical creation of a drainage pathway or implantation of a micro-stent to lower intraocular pressure in glaucoma.
• Vitrectomy: Removal of the vitreous gel to repair retinal detachments, macular holes, and vitreous haemorrhage.
• Corneal transplantation (DSAEK, DALK, PKP): Replacing diseased corneal layers with donor tissue to restore transparency and vision.
• LASIK and PRK refractive surgery: Laser reshaping of the corneal surface to correct myopia, hyperopia, and astigmatism and reduce dependence on spectacles.

Certain symptoms and clinical situations require prompt or urgent ophthalmological assessment:

• Sudden painless vision loss: Any abrupt reduction or loss of vision in one or both eyes may indicate retinal artery occlusion, retinal detachment, or vitreous haemorrhage and requires same-day emergency evaluation.
• Flashes and new floaters: New-onset flashing lights or a shower of floaters suggests posterior vitreous detachment or retinal tear with risk of detachment — urgent ophthalmology review within 24 hours is essential.
• Severe eye pain with redness and halos: Acute angle-closure glaucoma causes severe eye pain, nausea, red eye, and haloes around lights; this is an ocular emergency requiring immediate pressure-lowering treatment.
• Double vision (diplopia): New-onset double vision may indicate a neurological or muscle problem requiring ophthalmological and often neurological assessment.
• Eye injury or chemical exposure: Penetrating eye injury and chemical splashes to the eye are emergencies requiring immediate irrigation and emergency ophthalmological care.
• Annual diabetic eye screening: All patients with diabetes should have annual dilated fundus examination to detect diabetic retinopathy at a treatable stage before visual loss occurs.
• Gradual vision change: Progressive blurring, difficulty with contrast, or distortion of central vision (suggesting AMD) warrants elective ophthalmology referral.

Ophthalmologists complete an extensive medical and surgical training pathway. In the United States, this begins with a four-year medical degree (MD or DO), followed by a one-year internship in internal medicine or surgery, and then a three-year ophthalmology residency accredited by the Accreditation Council for Graduate Medical Education (ACGME). During residency, trainees develop skills in comprehensive eye examination, medical management of ocular disease, and surgical procedures including cataract surgery, laser treatments, and strabismus repair.

Subspecialty fellowships of one to two years are available in retina and vitreoretinal surgery, cornea and external disease, glaucoma, neuro-ophthalmology, oculoplastics, paediatric ophthalmology and strabismus, and refractive surgery. These fellowships provide advanced surgical volume and subspecialty expertise.

Board certification is awarded by the American Board of Ophthalmology (ABO) following a written qualifying examination and an oral examination. In the United Kingdom, ophthalmologists hold FRCOphth (Fellow of the Royal College of Ophthalmologists). Equivalent credentialing bodies exist in all countries. Ophthalmologists must maintain ongoing surgical competency as technology — particularly IOL platforms, anti-VEGF therapies, and MIGS devices — continues to evolve rapidly.

Routine eye examinations can be performed by an optometrist, who can screen for and detect many eye conditions and refer to an ophthalmologist when medical or surgical care is needed. Referral to an ophthalmologist is required for surgical conditions (cataract, glaucoma requiring surgery, retinal detachment), complex medical conditions (uveitis, diabetic retinopathy, AMD), and acute emergencies.

For urgent eye conditions such as sudden vision loss, new flashes and floaters, or acute eye pain, proceed directly to an emergency eye department or call your ophthalmologist's emergency line — do not wait for a routine appointment. When attending your first appointment, bring your spectacles or contact lens prescription, a list of all medications (some can affect eye pressure or the macula), and any prior eye examination records. Diabetic patients should confirm that their most recent HbA1c and blood pressure readings are well controlled before their eye appointment.