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Intravitreal Injection

A quick office procedure that places medicine inside the eye for retina disease, inflammation, infection, or swelling.

7 min read

An intravitreal injection places medication directly into the vitreous cavity - the gel-filled space inside the eye. Because the medicine is delivered close to the retina, high drug levels can be achieved inside the eye while limiting whole-body exposure. These injections are now routine for macular degeneration, diabetic macular edema, retinal vein occlusions, some infections, and inflammatory eye disease.

Key Takeaways

  • Medication goes directly inside the eye, close to the retina
  • Used for wet AMD, diabetic eye disease, vein occlusions, infections, and inflammation
  • The injection itself takes seconds after numbing and antiseptic prep
  • Done in the office, not usually in an operating room
  • Very safe in experienced hands, with sterile technique doing the heavy lifting
  • Repeat injections are common, depending on the disease and response

Medications Used

Anti-VEGF Agents (Most Common)

Block vascular endothelial growth factor (VEGF) to reduce abnormal blood vessel growth and leakage. See our anti-VEGF injections guide for detailed drug information, mechanisms, and outcomes.

Common Anti-VEGF Drugs:

  • Aflibercept (Eylea)
  • Ranibizumab (Lucentis)
  • Bevacizumab (Avastin)-off-label but widely used
  • Faricimab (Vabysmo)
  • Brolucizumab (Beovu)

Corticosteroids

Reduce inflammation and swelling:

  • Dexamethasone implant (Ozurdex)-slow-release pellet
  • Triamcinolone acetonide
  • Fluocinolone implant (Iluvien)

Other Medications

  • Antibiotics (for endophthalmitis)
  • Antivirals (for viral retinitis)
  • Ocriplasmin (Jetrea) (for vitreomacular traction)

Conditions Treated

Wet AMD:

  • Anti-VEGF injections are primary treatment
  • Dramatically improved outcomes
  • Converted previously blinding condition to manageable one

Diabetic Eye Disease

Retinal Vein Occlusions

  • Central retinal vein occlusion
  • Branch retinal vein occlusion
  • Treats associated macular edema

Other Conditions

  • Myopic choroidal neovascularization
  • Uveitic macular edema
  • Radiation maculopathy
  • Some retinal infections

The Injection Procedure

Preparation

Before the injection:

  • Eye is numbed with anesthetic drops or gel
  • Antiseptic (povidone-iodine, betadine) applied to kill bacteria
  • Eyelid speculum placed to keep eye open
  • You look in a specific direction

During the Injection

  1. The needle is inserted through the white of the eye (sclera)
  2. Enters the vitreous cavity
  3. Medication is injected
  4. Needle is withdrawn
  5. Antiseptic reapplied

Total time: approximately 30 seconds to 2 minutes for the injection itself. Preparation usually takes longer than the injection.

What You'll Feel

  • Pressure sensation, most common
  • Brief stinging from antiseptic
  • A brief awareness that the eye was treated
  • Rarely, a quick sharp sensation

Most patients find the anticipation worse than the actual injection.

While the idea of an eye injection sounds frightening, most patients report minimal discomfort. The eye is thoroughly numbed, and the procedure is very quick.

After the Injection

Immediately After

  • Vision may be blurry from numbing drops, antiseptic, medication, or tiny air bubbles
  • The eye may be red where the needle entered
  • Small floaters or bubbles may be visible temporarily
  • Pressure or scratchiness for a few hours is common

First Few Days

Normal experiences:

  • Mild redness at injection site
  • Scratchy sensation
  • Floaters (especially small bubbles)
  • Slight discomfort

When to call your doctor:

Activity Restrictions

  • Most normal activities can resume immediately
  • Some doctors advise avoiding swimming for a day or two
  • Avoid rubbing the eye
  • Use drops only if your doctor prescribed them; routine antibiotics after every injection are not always used

Risks and Complications

Common (Usually Minor)

  • Subconjunctival hemorrhage (red spot on white of eye)-usually benign and self-limited
  • Floaters-usually temporary
  • Mild discomfort
  • Transient elevated eye pressure

Rare but Serious

Endophthalmitis (Infection Inside Eye):

  • Risk approximately 1 in 2,000 to 1 in 5,000 injections
  • Reduced by strict sterile technique
  • Requires emergency treatment
  • Can cause vision loss if delayed

Retinal Detachment:

  • Very rare
  • Symptoms: flashes, floaters, curtain over vision

Other Rare Complications:

  • Cataract (from needle touching lens)
  • Persistent elevated eye pressure
  • Bleeding inside eye
  • Stroke or heart attack (with anti-VEGF-very rare)

Treatment Schedules

Loading Phase

Many protocols start with monthly injections:

  • Build up drug levels in the eye
  • Gain control of the disease
  • Typically 3 or more monthly injections

Maintenance Phase

After initial control, various approaches:

Fixed Interval:

  • Injections at regular intervals (e.g., every 8 weeks)
  • Predictable but may over- or under-treat

Treat and Extend:

  • Gradually increase interval if stable
  • Decrease if disease recurs
  • Personalized approach

PRN (As Needed):

  • Inject only when disease recurs
  • Requires frequent monitoring visits
  • May result in worse outcomes than regular treatment

How Long?

  • Treatment is often ongoing (years)
  • Some patients achieve stability and can extend or stop
  • Others need continued injections
  • Depends on condition and individual response

What to Expect Over Time

Typical Journey

  1. Diagnosis: Condition requiring injection identified
  2. Loading phase: Monthly injections for 3+ months
  3. Assessment: Check response, adjust plan
  4. Maintenance: Ongoing treatment as needed
  5. Monitoring: Regular visits even if injections spaced out

Realistic Expectations

  • Most patients maintain or improve vision
  • Complete cure is uncommon-management is the goal
  • Treatment burden is real (frequent visits)
  • Benefits outweigh risks for most patients

Frequently Asked Questions

Does the injection hurt?

Most patients experience minimal discomfort, usually pressure, a quick sting, or little sensation at all. The eye is thoroughly numbed before the injection. Many patients report that anticipation is worse than the injection itself.

Will I see the needle?

You may see a blur, shadow, or movement, but you usually will not see the needle clearly. Looking where instructed keeps your vision directed away from the injection site.

How long does the injection take?

The actual injection takes seconds. The entire appointment, including preparation and post-injection check, typically takes 15-30 minutes.

How many injections will I need?

This varies widely by condition and individual response. Some patients need monthly injections for years; others can eventually extend to every few months. Your doctor will develop a personalized treatment plan.

Can I drive after the injection?

Most patients can drive after the effects of the dilating drops wear off (a few hours). Vision may be blurry initially from the drops and procedure. If in doubt, arrange transportation.

Why do I need injections so often?

The medications work locally in the eye and wear off over weeks. Regular injections maintain therapeutic drug levels. Researchers are developing longer-lasting treatments.

Are there alternatives to injections?

For most conditions treated with intravitreal injections, injections are the most effective option. Laser treatment may be an adjunct or alternative in some cases. Discuss options with your doctor.

What if I miss an injection?

Contact your doctor to reschedule as soon as possible. Missing injections can allow the disease to progress. If significant time has passed, your doctor may adjust the treatment plan.

Can both eyes be injected at the same visit?

Many doctors do inject both eyes in a single visit if both are being treated. Some prefer separate visits to reduce the (very small) risk of bilateral infection. Discuss the approach with your doctor.

References

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