Glaucoma Medications: A Guide to Eye Drops and Side Effects
What every glaucoma patient in Seoul should know about their eye drops
Q. What are glaucoma eye drops, and do they have side effects?
Glaucoma eye drops lower intraocular pressure (IOP) to prevent optic nerve damage. Yes, they can have side effects — from mild eye irritation to systemic effects on heart rate or breathing. Knowing what to expect helps patients in Yeongdeungpo, Guro, Gasan, and Gwanak stay consistent with treatment and report problems early.
Q. What is glaucoma and why are medications needed?
Glaucoma is a group of eye diseases that damage the optic nerve, usually due to elevated intraocular pressure (IOP). It is the leading cause of irreversible blindness worldwide. In South Korea, glaucoma affects an estimated 3–4% of adults over 40, yet many cases go undetected because early-stage glaucoma causes no pain and no obvious vision loss. By the time symptoms appear, significant damage has already occurred. This is why glaucoma eye drops — the first-line treatment — are so critical: they must be used consistently, even when patients feel completely fine.
Glaucoma in Korea: Key Statistics
- ▸ Glaucoma affects approximately 3.4% of Koreans over age 40 (Korean Ophthalmological Society)
- ▸ Normal-tension glaucoma accounts for over 75% of cases in Korea — higher than Western populations
- ▸ Only about 50% of glaucoma patients in Korea are aware of their diagnosis
- ▸ High myopia (common in Seoul) significantly increases glaucoma risk — myopia rates exceed 95% in Korean young adults
Q. What types of glaucoma eye drops are prescribed in Korea?
Several drug classes are used to treat glaucoma. Prostaglandin analogues (latanoprost, travoprost, bimatoprost) are the most commonly prescribed first-line agents — they reduce IOP by increasing aqueous outflow. They are typically applied once daily at night. Beta-blockers (timolol, betaxolol) reduce aqueous production and are often combined with prostaglandins for additive effect.
Other classes include alpha-2 agonists (brimonidine), carbonic anhydrase inhibitors (dorzolamide, brinzolamide), and ROCK inhibitors — a newer class now available in Korea. At Nunehim Eye Center in Guro, Dr. Daniel Baik tailors the drop regimen to each patient’s IOP levels, corneal thickness, and systemic health profile.
Q. What are the common side effects of glaucoma eye drops?
Side effects vary by drug class. Prostaglandins can cause increased iris pigmentation (darkening of the eye colour), eyelash growth, periorbital fat loss, and red/itchy eyes. These changes are usually cosmetic and reversible upon stopping the medication.
Timolol (a beta-blocker) can be absorbed systemically and may slow heart rate, lower blood pressure, and worsen asthma or COPD. Patients in Gasan and Gwanak with respiratory or cardiovascular conditions should inform their ophthalmologist before starting timolol. Alpha-2 agonists like brimonidine can cause drowsiness and dry mouth. Many side effects can be minimized by practising nasolacrimal occlusion — pressing the inner corner of the eye after instillation to reduce systemic absorption.
Q. When should I contact my eye doctor about side effects?
- Sudden severe eye pain, redness, or vision changes — seek care immediately
- Shortness of breath or wheeze after starting beta-blocker drops
- Significant slowing of pulse (under 50 bpm) or dizziness
- Persistent eye irritation or allergic reaction (swelling, discharge)
- Noticeable colour change in iris — discuss with your ophthalmologist
- You feel the drops are not working or notice worsening peripheral vision
Prostaglandins
Latanoprost, travoprost, bimatoprost. Once-daily (night). Most effective IOP reduction. Watch for iris colour change and lash growth.
Beta-Blockers
Timolol, betaxolol. Twice-daily. Often combined with prostaglandins. Systemic absorption can affect heart and lungs — use with caution in cardiac/asthma patients.
CAI / ROCK Inhibitors
Dorzolamide, brinzolamide, ripasudil. Newer ROCK inhibitors now available in Korea. Good add-on therapy with fewer systemic effects.
A Note from Dr. Daniel Baik
“Glaucoma is a silent thief of vision. The most important thing I tell my patients — whether they come from Yeongdeungpo, Guro, or Gasan — is that their eye drops are protecting vision they cannot get back. Side effects are real and we manage them together, but missing doses is the one thing we cannot undo. I offer English consultations so expat patients fully understand their diagnosis and feel confident using their medications correctly.” — Dr. Daniel Baik, board-certified ophthalmologist, Nunehim Eye Center
❓ Frequently Asked Questions: Glaucoma Eye Drops
Q. How long do I need to use glaucoma eye drops?
Glaucoma is a chronic condition, so most patients need drops indefinitely. The goal is to maintain safe IOP levels long-term to preserve the optic nerve. Your ophthalmologist will monitor your IOP at regular check-ups (typically every 3–6 months in Seoul) to ensure the medication is working.
Q. Can I switch glaucoma eye drops if I have side effects?
Yes. If a particular drop causes intolerable side effects, there are often alternatives within the same class or different drug classes. Never stop drops suddenly without consulting your ophthalmologist, as IOP can spike rapidly. Dr. Baik at Nunehim Eye Center in Guro helps patients find a well-tolerated regimen.
Q. Can I use glaucoma drops if I wear contact lenses?
Most glaucoma drops contain preservatives (especially benzalkonium chloride) that should not be deposited on soft contact lenses. The standard recommendation is to remove contacts, instil the drops, and wait 15 minutes before reinserting lenses. Preservative-free formulations are available for sensitive eyes.
Q. What happens if I forget to use my glaucoma drops?
If you miss a dose, apply it as soon as you remember — unless it is almost time for the next dose. Never double-dose. Consistent daily use is essential because IOP can rise within 24 hours of missing a dose, especially with once-daily prostaglandins. Phone reminders or a bedtime routine help patients in busy Gasan and Gwanak maintain consistency.
Q. Do glaucoma eye drops cure glaucoma?
No. Glaucoma eye drops control IOP but do not cure the underlying optic nerve disease. They prevent further damage. Vision already lost to glaucoma cannot be recovered. This is why early diagnosis through regular comprehensive eye exams — available at Nunehim Eye Center — is critical, especially for patients in Yeongdeungpo with high myopia or a family history of glaucoma.
Q. Are laser or surgical treatments available instead of drops?
Yes. Selective laser trabeculoplasty (SLT) is increasingly used as a first-line alternative to drops in Korea. For advanced cases, surgical options such as trabeculectomy or MIGS (minimally invasive glaucoma surgery) are available. These options are discussed at Nunehim Eye Center based on disease severity and patient preference.
Q. Can normal-tension glaucoma be treated with the same drops?
Yes. Even though IOP is in the “normal” range in NTG, lowering it further by 30% or more slows progression. The same prostaglandin analogues and other glaucoma drops are used. NTG is particularly common in Korea — accounting for over 75% of glaucoma cases — so Korean ophthalmologists are very experienced in managing it.
Book a Glaucoma Consultation in Seoul
Serving patients from Yeongdeungpo, Guro, Gasan, Gwanak and beyond. English consultations available.
📍 Visit Nunehim Eye Center — Guro, Seoul
Convenient access from Guro, Gasan, Gwanak & Dongjak. Near Guro Digital Complex Station (Line 2).
🏥 Address
Yeongdeungpo-gu, Seoul
nunehim.com
🕘 Hours
Mon–Fri: 9:00–18:00
Sat: 9:00–13:00
🌐 Languages
Korean & English consultations available
Leave a comment