Korea Retinal Vascular Occlusion Center: When Is the Trip Worth It?
Has your father or mother just been told a blood vessel in the retina is blocked, and you're wondering whether a Korea retinal vascular occlusion center is worth the flight, or whether there's even time for one?
On this page
Vein or artery: why the timetable differs
Before you book anything, read this through.
You'll know which kind of occlusion can wait for a planned visit and which can't, which treatment methods are used, what reviews of eye injections get right and wrong, and what decides the cost. That's what you need to choose between care at home and a trip to Seoul.
Hello, I'm Dr. Yu Hyeong-Gon, Center Director at Sky Eye Clinic in Seoul. I'm a retina specialist, and I was a professor at Seoul National University Hospital from 2001 to 2022.
At our Retina Center I see patients directly. The center has CIRRUS OCT 6000, CLARUS and OPTOS wide-angle fundus imaging, and the EasyRet retinal laser. Interpreters on site speak English, Japanese and Chinese, and overseas patients pay the same fees as patients from Korea.
I wrote this because families often treat every 'eye stroke' as one problem with one timetable, and that mix-up matters most when the blocked vessel is an artery.
Briefly: a retinal vein occlusion usually leaves time to plan, because treatment focuses on controlling swelling in the macula over months. Sudden vision loss from an artery occlusion is an emergency to be handled as a possible stroke wherever your parent is, that same day.
The retina has arteries bringing blood in and veins carrying it out. A block on either side is called a retinal vascular occlusion, and people use the word 'stroke' for both. The urgency is very different.
In a vein occlusion, the main vein or one of its branches is blocked, usually by a clot. The American Academy of Ophthalmology explains that blood and fluid then leak into the retina and the macula can swell, which blurs central vision. It mostly affects people 50 and older, and high blood pressure, diabetes, glaucoma and hardening of the arteries raise the risk.
In an artery occlusion, blood stops reaching the retina. A 2017 EyeNet article from the Academy calls central retinal artery occlusion an ocular emergency and the eye's equivalent of a cerebral stroke, and says prompt referral for stroke evaluation is necessary, preferably within hours of the first symptoms. Nobody should board a plane for that. Our own retina page puts it in plain words: sudden vision loss or a dark curtain across part of your sight can mean a detachment or a vessel occlusion, so don't wait for it to pass.
| Vein occlusion | Artery occlusion | |
|---|---|---|
| What's blocked | A vein draining the retina | An artery feeding the retina |
| How it starts | Blur, sudden or over hours to days | Sudden loss, often without pain |
| First step | Eye exam and scans, then a plan | Emergency stroke evaluation where you are |
| Room for a planned trip | Often, once assessed | Not for the acute event |
What does a retina visit check first?
For a vein occlusion, the Academy describes a dilated eye exam and OCT scans, with fluorescein angiography or OCT angiography to look at blood flow. People under 40 may also have blood tests for clotting problems.
At our Retina Center the doctor chooses the tests that match the symptoms, from OCT and wide-angle fundus photos to VUNO Fundus AI. The imaging has to answer two things: how swollen the macula is, and whether the retina is short of blood in a way that could lead to new, fragile vessels. Our retinal vascular disease page covers the artery and vein types in more detail.
Dilating drops blur near vision and make light glare for a few hours, so your parent shouldn't plan to drive or read fine print that afternoon.
Which treatment methods are used for retinal vein occlusion?
The goal is to keep vision stable by limiting swelling and sealing leaking vessels. The Academy lists three main tools.
Anti-VEGF injections into the eye reduce swelling in the macula. Many people need a series of them over months rather than a single dose, with the gap between them guided by how the scans respond.
Steroid injections into the eye also reduce swelling. They can raise eye pressure or speed up a cataract, so they're weighed against those effects, especially in someone who already has glaucoma.
Panretinal photocoagulation, a laser treatment, is used in severe cases where new abnormal vessels are growing. It lowers the risk of bleeding inside the eye and of eye pressure climbing too high. When a bleed doesn't clear, vitrectomy is a surgical option; our center has EVA Nexus vitrectomy equipment as well as the EasyRet laser.
The Academy also notes it usually takes a few months after treatment before vision starts to improve. How far it improves follows how severe the occlusion was. Our retina care works by one principle: treatment for the patient, not for volume. In practice that means avoiding treatment an eye doesn't need, and a branch occlusion with little swelling may simply be watched.
Who is a trip to Seoul right for?
A visit to a Korea retinal vascular occlusion center fits best when the blocked vessel is a vein, the diagnosis has been made, and the family wants a full assessment and a clear plan, such as a second view on whether injections are needed now. It fits poorly for any sudden, fresh loss of vision, and for an artery occlusion that still needs its stroke workup.
Say your mother is 68, lives in Los Angeles, takes medicine for blood pressure, and was told three weeks ago she has a branch vein occlusion with some macular swelling. Her vision is blurred but stable. I'd want the scans to answer whether that swelling needs injections now. If it does, the practical question becomes who gives the follow-up injections, because a series every few weeks can't mean a series of long-haul flights.
If instead your father lost the sight in one eye suddenly this morning, none of that planning applies. The trip is to the nearest emergency department.
Many retinal diseases cause no early symptoms, and by the time vision drops, the right moment for treatment may have passed. With an occlusion I think about the other eye too. The same blood pressure, blood sugar and artery health that blocked one vessel are still at work, so I want both eyes examined and those risks managed with your parent's family doctor at home.
What can go wrong, during treatment and after the flight home
Risks and side effects to know
After an injection into the eye, a scratchy or bloodshot eye for a day or two and a few new floaters are common. Eye pressure can rise for a short time. Infection inside the eye is rare but serious, and it shows up as pain, redness and falling vision that get worse in the days after.
Laser treatment for new vessels can reduce side and night vision to some degree, which is the trade for lowering the risk of bleeding and pressure problems. The disease itself carries a risk too: when the retina is starved of blood, new vessels can grow at the front of the eye and push pressure up, a form of glaucoma that needs its own treatment.
Who should raise it before any injection: anyone with an active eye infection or inflammation, recent eye surgery, pregnancy, or a recent stroke or heart attack. Tell the doctor before treatment, not after.
Once you're home, pain that gets worse rather than better, a red eye, or a sudden drop in vision after treatment needs an ophthalmologist that same day. The CDC's medical-tourism guidance advises planning follow-up care at home before you travel. How much vision returns varies from person to person.
Before booking flights, find out what can continue at home. Send your parent's latest scan report and their current medication list on WhatsApp, and ask the question that shapes the whole plan: could treatment carry on near where you live?
What do reviews of eye injections get right?
Forum threads about eye injections tend to repeat three claims.
'The needle sounds terrifying, but it's over in seconds.' Broadly true. Numbing drops are used, and most people describe pressure more than sharp pain. The worry beforehand is often the hardest part.
'One injection and my vision came back.' It happens, but it isn't the usual pattern for swelling from a vein occlusion. A series over months is more common.
'Once the swelling went down, my sight was normal again.' Sometimes. If the macula was swollen for a long time or short of blood, some blur can remain even after the scan looks dry.
What decides the cost?
The type of occlusion and how severe it is come first. Then which tests the eye needs (OCT, wide-angle imaging, angiography), whether treatment means injections, laser, watching, or occasionally surgery, and how many sessions. The number of days in Seoul and the visits that fit into them matter, as does the follow-up you arrange at home.
Overseas and domestic patients pay the same fees here. Ask on WhatsApp what it would cost for your parent's case, with a photo of the latest eye report.
Planning a visit with your parent
We're open Monday to Wednesday and Friday from 10:00 to 16:30, with lunch from 13:00 to 14:00. Thursdays are closed for equipment inspection, and Saturday runs 10:00 to 14:30 for exams and surgeries only. Sundays and public holidays are closed, and every exam and consultation is by appointment.
The clinic is about a five-minute walk from Nonhyeon Station (Line 7 Exit 5, Sinbundang Line Exit 4) or Sinnonhyeon Station (Line 9 Exit 2). If someone traveling with your parent is weighing vision correction on the same trip, our vision-correction team wrote about how corneal thickness decides between LASIK and LASEK.
On WhatsApp, send a photo of the most recent eye report and the date your parent's vision changed, plus the one decision your family is stuck on. When you come, I examine your parent's eyes myself and recommend the treatment that fits them, even when that means less treatment.
Results vary by individual.
Sources
Questions answered
Is a retinal vein occlusion the same as an eye stroke?
People call both vein and artery occlusions an eye stroke. The artery type is the one treated like a cerebral stroke and needs emergency evaluation. A vein occlusion is serious too, but it usually allows time for scans and a treatment plan.
Can my parent fly home after an injection into the eye?
An injection on its own doesn't usually rule out flying, unlike some retinal surgeries that leave a gas bubble in the eye, where flying has to wait. Confirm with the treating doctor before you book the return flight.
Who treats retinal disease at Sky Eye Clinic?
Retina specialist Dr. Yu Hyeong-Gon sees patients at the Retina Center. He was a professor at Seoul National University Hospital from 2001 to 2022.
Does an occlusion in one eye put the other eye at risk?
The risk factors behind it, such as high blood pressure, diabetes and hardening of the arteries, affect both eyes. Keeping them under control with a doctor at home, along with not smoking and staying active, lowers the risk.
Is there an interpreter for international patients?
Yes. Interpreters on site speak English, Japanese and Chinese, and overseas and domestic patients pay the same fees.
Get your free consultation before you decide
- Free consultation and checkup, even if you decide against surgery
- Same price as Korean patients, no overseas surcharge
- Interpreters in English, Japanese and Chinese
