Which Department

Which department should I see for a dark curtain over part of your vision?

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

Short answer

Ophthalmology(안과) is the first department to see when you notice a dark curtain or shadow blocking part of your vision. Depending on the underlying cause, your ophthalmologist may refer you to a neurologist or internal medicine specialist, but the eye exam always comes first to rule out vision-threatening conditions.

Which department

  1. 1Ophthalmology(안과)
    Ophthalmologists are trained to evaluate the retina, vitreous, and optic nerve — the structures most commonly linked to a curtain-like visual obstruction. Conditions such as retinal detachment or vitreous hemorrhage are within this specialty's primary scope. — First / second line: In most cases, visiting an ophthalmology clinic(의원) first is appropriate; however, because this symptom can indicate a sight-threatening emergency, many patients are directed to a hospital-level ophthalmology department(병원 안과) for immediate imaging equipment. Secondary hospitals(병원/종합병원) can generally be visited directly with normal health insurance coverage, while a referral letter(요양급여의뢰서) is required for insurance coverage only at tertiary hospitals(상급종합병원).
  2. 2Neurology(신경과)
    When a curtain-like visual loss is accompanied by facial drooping, speech difficulty, or limb weakness, the cause may be neurological rather than ocular, and a neurologist evaluates the visual pathways from the optic nerve to the brain. — First / second line: Generally, a neurologist is consulted after an ophthalmologist has ruled out a purely ocular origin, or when stroke-related symptoms appear alongside the visual change. In urgent neurological scenarios, the emergency department takes priority over scheduling an outpatient appointment.
  3. 3Internal Medicine / Cardiovascular Medicine(내과/심장내과)
    Systemic conditions such as uncontrolled hypertension or cardiovascular disease can cause sudden vascular events affecting blood supply to the retina, which may present as a dark curtain or shadow in vision. — First / second line: This specialty is usually involved as a secondary step after ophthalmology, particularly when a vascular or systemic cause is suspected based on the initial eye examination findings. The ophthalmologist will typically initiate the referral.

Go to the ER / call 119 if

If any of the following applies, do not choose a department — go to an emergency room or call 119 (Korea's emergency number).

  • The dark curtain appears suddenly within seconds or minutes and covers a large portion or all of your vision in one eye
  • You also experience sudden severe headache, facial weakness, arm or leg weakness, or difficulty speaking at the same time
  • You have recently had a significant eye injury or trauma preceding the visual change
  • You experience sudden complete loss of vision in one eye, even briefly, that then partially recovers
  • You notice the curtain spreading rapidly rather than staying in one fixed position over a short period

Before your visit

  • Note the exact time when the dark curtain first appeared and whether it came on suddenly or gradually.
  • Observe whether the shadow is in one eye or both eyes by covering each eye alternately.
  • Record any other symptoms that appeared at the same time, such as floaters, flashes of light, headache, or dizziness.
  • List all medications you are currently taking, including blood thinners or eye drops, as these are relevant to the doctor's assessment.
  • Bring any previous eye examination records, eyeglass or contact lens prescriptions, or imaging results if available.
  • Recall whether you have a history of high myopia, diabetes, hypertension, or prior eye surgery, as these are commonly asked during the consultation.

General principles

A dark curtain or shadow covering part of the visual field is a symptom that ophthalmology evaluates first because the most structurally direct causes involve the retina or vitreous humor inside the eye. The retina is a light-sensitive layer at the back of the eye, and when it is displaced or its blood supply is interrupted, the corresponding area of vision can go dark. An ophthalmologist uses specialized instruments and imaging to examine these structures non-invasively.

The general flow in Korean medical practice begins at an ophthalmology clinic or hospital department, where dilation of the pupil and fundus examination are standard starting points. If the findings point to a systemic or neurological cause, a referral to the appropriate specialty follows. Because large hospital departments often have same-day urgent slots for sudden vision changes, patients with acute onset are generally advised to seek care promptly rather than waiting for a routine appointment.

Not all curtain-like visual symptoms originate from the same structure, which is why the clinical interview about onset speed, location, associated symptoms, and medical history matters greatly. Gradual onset over days may suggest a different mechanism than a sudden onset over seconds. The doctor uses this history together with examination findings to determine the next steps in care — no single symptom alone determines the diagnosis.

FAQ

Should I go to a small eye clinic(의원) or directly to a large hospital(병원) for this symptom?

Generally, if the dark curtain appeared suddenly — especially within the past few hours — seeking care at a hospital-level ophthalmology department is advisable because they tend to have the imaging equipment needed for urgent retinal evaluation. If onset was more gradual and mild, a primary ophthalmology clinic can assess whether a referral is needed. When in doubt about urgency, erring on the side of going to a larger facility is a reasonable approach.

Could this symptom be confused with floaters or a different eye condition?

Eye floaters(비문증) typically appear as moving spots or strings that drift across your vision, whereas a dark curtain tends to be a fixed, non-moving shadow blocking a portion of the visual field. A sudden increase in floaters combined with flashes of light can sometimes precede a curtain-like shadow, and an ophthalmologist can distinguish between these presentations during examination. Reporting the exact character of what you see — moving vs. fixed, transparent vs. dark — helps the doctor narrow down the possibilities.

What kinds of examinations are generally done in ophthalmology for this symptom?

In general, ophthalmologists commonly begin with visual acuity testing and then perform a dilated fundus examination to view the retina and optic nerve directly. Imaging tools such as optical coherence tomography or ultrasound of the eye are sometimes used to assess retinal layers or detect fluid. The specific examinations recommended in any individual case are determined by the doctor based on findings during the initial evaluation.

Is there any difference in how this symptom is handled for elderly patients versus younger adults?

Older adults have statistically higher associations with vascular causes such as retinal vein or artery occlusion, so systemic health factors like blood pressure and cholesterol are often reviewed in parallel with the eye examination. Younger patients with high myopia may have a different risk profile related to retinal structure. Regardless of age, the general principle remains the same: sudden onset of a dark curtain warrants prompt ophthalmological evaluation, and the doctor adjusts the clinical reasoning based on the individual patient's age and background.

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This page is general medical information and does not replace diagnosis, treatment or choosing a clinic. Consult a doctor for any symptom. In an emergency, go to the ER or call 119 immediately.