Which department should I see for a narrowing field of vision?

2026-09-17 · Neutral information that names no hospital, doctor or region. No rankings, recommendations or reviews.

Which department

1. 1Ophthalmology(안과)
   Visual field narrowing is most often caused by conditions affecting the eye's internal structures — such as the optic nerve, retina, or drainage system — all of which fall within the scope of ophthalmology. This department uses specialized equipment to assess the visual field objectively and evaluate the health of eye structures that cannot be checked by simple inspection. — First / second line: In most cases, starting at an ophthalmology clinic(의원) is appropriate for a first visit. If the clinic determines that the cause may be outside the eye — for example, related to the brain or optic pathway — a referral letter(진료의뢰서) to a secondary or tertiary hospital is generally issued.
2. 2Neurology(신경과)
   The visual pathway runs through the brain, and lesions at certain points along this pathway can cause characteristic patterns of visual field loss. Neurology evaluates whether the narrowing originates from the brain or optic nerves rather than the eye itself. — First / second line: A visit to neurology is generally prompted by a referral from ophthalmology, or when neurological symptoms — such as persistent headache, dizziness, numbness, or cognitive changes — appear alongside the visual field change. In such cases, a secondary or tertiary hospital setting is more common.
3. 3Neurosurgery(신경외과)
   Certain structural causes in the brain — such as tumors or vascular abnormalities pressing on the optic pathway — may require neurosurgical evaluation. This department typically becomes involved after imaging or neurological assessment points to a structural lesion. — First / second line: Neurosurgery is usually reached via referral from neurology or ophthalmology rather than as a first visit. It is generally accessed at a hospital(병원) or tertiary medical center level.
4. 4Internal Medicine(내과) — Endocrinology focus
   Systemic conditions such as diabetes or hypertension can gradually damage blood vessels supplying the retina or optic nerve, contributing to visual field changes over time. If a known systemic condition is suspected as the underlying cause, internal medicine may be involved in the overall care. — First / second line: Internal medicine is typically consulted in parallel with ophthalmology when a systemic disease is already known or suspected, rather than being the first point of contact for this symptom alone.

Go to the ER / call 119 if

Before your visit

• Note when you first noticed the narrowing — whether it came on suddenly or gradually over days, weeks, or months.
• Observe whether the narrowing affects one eye or both, and whether it is more pronounced on a specific side (left, right, upper, or lower field).
• Record any accompanying symptoms such as headache, eye pain, flashes of light, floating spots, nausea, or changes in color perception.
• Bring a list of all medications and supplements you are currently taking, as some can affect vision or eye pressure.
• If you have a history of eye conditions, diabetes, hypertension, or previous eye or brain injuries, prepare a brief summary or bring any prior medical records.
• If you wear glasses or contact lenses, bring them to the appointment along with your most recent prescription if available.

General principles

Narrowing of the visual field — sometimes described as tunnel vision or a sense that peripheral vision is shrinking — can originate at several points along the visual pathway, from the eye itself to the optic nerve and into the brain. Because the most common causes involve the eye directly (such as elevated intraocular pressure affecting the optic nerve, or retinal conditions), ophthalmology is generally the starting point for evaluation.

In a typical care flow in Korea, a patient would first visit an ophthalmology clinic(의원) for an initial assessment. The clinic may perform basic visual field testing and examine the eye structures. If the cause is unclear or a systemic or neurological origin is suspected, the clinic will generally issue a referral letter for a secondary or tertiary hospital, where more advanced imaging or specialist consultation can be arranged.

Visual field testing in ophthalmology typically involves automated perimetry, which maps the boundaries of what each eye can detect without moving. This kind of objective measurement helps distinguish patterns associated with eye-origin causes from those associated with brain-pathway causes, guiding whether the next step involves further ophthalmic investigation or neurological imaging — all decisions made by the consulting physician after evaluation.

Korea's national health insurance(건강보험) generally covers diagnostic evaluations for medically indicated symptoms. Visiting a primary clinic before a large hospital is generally encouraged in practice, though direct visits to secondary hospitals (병원/종합병원) are covered under normal insurance rules without a referral. A referral letter is required for standard insurance coverage only at tertiary hospitals (상급종합병원).

FAQ

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Find a clinic (external directories)

External directories for finding a clinic by region once you know the department (public data, no rankings or recommendations).

• Eye clinic directory (koreaeyeclinics.com)
• Hospital directory by region (koreahospital.org)