Eylea Injection: How It Works, Results and What to Expect

An Eylea injection is a prescription treatment placed into the eye to lower the effects of excess vascular endothelial growth factor (VEGF), a protein that can cause abnormal blood vessels and retinal swelling. It is used for several retinal diseases and is given by an ophthalmologist as part of an individualized monitoring and treatment plan.

Overview: What Is an Eylea Injection?

An Eylea injection is an intravitreal injection of aflibercept, a medicine used to treat retinal conditions involving abnormal blood vessel growth or fluid leakage at the back of the eye. It is most commonly used for wet age-related macular degeneration, diabetic macular edema, diabetic retinopathy, macular edema following retinal vein occlusion, and some other retinal vascular conditions.

The injection is performed by a trained ophthalmologist, usually a retina specialist, in a sterile clinical setting. Although the idea of an eye injection can feel worrying, the eye is numbed first and the procedure itself is typically brief. The purpose is to preserve vision where possible, reduce retinal swelling, and lower the risk of further vision loss.

Eylea is not a cure for the underlying retinal disease. Many people need repeat treatment and regular eye imaging so their specialist can assess retinal fluid and make decisions about the timing of future injections.

How Does Eylea Work?

Eylea injection works by blocking the activity of vascular endothelial growth factor, usually called VEGF. VEGF is a naturally occurring signaling protein, but in certain retinal diseases it can become overactive. This may lead to fragile, abnormal blood vessels, leakage of fluid or blood, and swelling within the retina or macula.

Aflibercept acts as a VEGF inhibitor. By binding to VEGF, it helps limit abnormal vessel growth and leakage. In practical terms, this can reduce fluid seen on retinal scans and help protect the central vision used for reading, recognizing faces, and detailed tasks.

Response varies between individuals. Some people notice a change in vision relatively soon, while for others the earliest evidence of benefit is seen on optical coherence tomography (OCT), a scan that shows whether fluid and swelling are decreasing. The best results often depend on attending planned monitoring visits and receiving treatment before retinal damage becomes permanent.

Related retinal conditions can include diabetic retinopathy and retinal vein occlusion. A retina specialist considers the diagnosis, scan results, overall health, and previous treatment response when recommending anti-VEGF therapy.

Who May Be a Candidate for Eylea?

Eylea may be considered for adults with retinal diseases in which VEGF-driven leakage or abnormal blood vessels are contributing to vision problems. Symptoms can include blurred or distorted central vision, a dark or missing area in the visual field, difficulty reading, reduced color contrast, or a rapid change in sight in one eye.

Before treatment, the ophthalmologist usually checks visual acuity, examines the retina after dilating the pupils, and performs OCT imaging. Fluorescein angiography or other tests may sometimes be used to clarify the pattern of leaking blood vessels. These assessments help confirm whether anti-VEGF treatment is suitable and provide a baseline for follow-up.

Eylea may not be appropriate for an eye with an active infection or significant inflammation. People should tell their eye specialist about previous eye surgery, glaucoma, eye infections, allergies, pregnancy or breastfeeding, and all medicines they use. This allows the care team to discuss potential benefits, limitations, and relevant safety considerations.

For people with diabetes, good management of blood glucose, blood pressure, and cholesterol remains important alongside retinal treatment. In some circumstances, laser treatment or surgery may also be considered, depending on the retinal diagnosis and severity.

What Happens During an Eylea Injection?

Eylea injection should only be given by a qualified eye-care professional; it is not an injection that a person should attempt to administer at home. The appointment commonly begins with a vision check and, when needed, retinal imaging. The eye is cleaned carefully with an antiseptic solution to reduce the risk of infection.

Local anesthetic drops, gel, or a small anesthetic injection are used to numb the eye. The clinician may use a small device to keep the eyelids open. The medicine is then injected through the white part of the eye, called the sclera, into the vitreous cavity. Most people feel pressure, mild discomfort, or a brief sensation rather than significant pain.

Afterward, the eye may be checked for immediate complications, and the patient receives aftercare instructions. Vision may be temporarily blurred from dilating drops, antiseptic, tears, or small air bubbles. It is sensible to arrange help getting home if vision is not clear enough to travel safely.

Intravitreal anti-VEGF treatment is part of retina treatment that may include monitoring with OCT scans, management of contributing health conditions, and other procedures when clinically indicated.

How Often Is Eylea Given and How Quickly Can It Work?

How often an Eylea injection is given depends on the condition being treated, the treatment stage, and the response shown by vision tests and retinal scans. Some treatment plans begin with injections at regular short intervals, followed by longer intervals once the retina is stable. Other people may continue frequent treatment or have their schedule adjusted over time.

There is no single answer to how long Eylea takes to work. The medicine begins acting on VEGF after it is delivered into the eye, but meaningful clinical improvement may be noticed over days to weeks, and retinal changes are often evaluated at follow-up visits. Some eyes improve after early injections, while others need several treatments before fluid reduces or vision stabilizes.

It is important not to judge treatment success only by day-to-day eyesight. Retinal conditions can fluctuate, and a person may have improved OCT findings even if visual improvement is subtle. Conversely, vision may not fully recover when the retina has already developed scarring or long-standing damage.

Missing appointments can allow retinal fluid or abnormal vessel activity to return. Patients should discuss any difficulty attending follow-up care with their ophthalmology team so that a safe, realistic treatment plan can be arranged.

How Do You Know EYLEA Is Working?

Eylea may be working when OCT scans show less fluid or swelling in the retina, when abnormal blood vessel activity is reduced, or when vision remains stable rather than declining. Some people also notice clearer central vision, less distortion of straight lines, improved reading ability, or better contrast. These changes can be gradual and are not identical for every person.

Regular monitoring is essential because retinal imaging can detect changes that are not yet obvious to the patient. The ophthalmologist compares current scans and vision measurements with earlier results to determine whether the eye is responding and whether the injection interval should be maintained, shortened, or extended.

A stable result can be clinically valuable. In progressive retinal disease, preventing additional vision loss may be an important treatment goal even if there is not a dramatic improvement in sight. Patients should continue reporting new symptoms between appointments rather than waiting for their next planned injection.

Does Vision Improve After EYLEA Injection?

Vision can improve after an Eylea injection, particularly when retinal swelling or active leakage is reduced before it causes irreversible damage. The degree of improvement depends on the underlying condition, how long it has been active, the condition of the macula, and whether scarring or other retinal injury is present.

For some people, the first benefit is stabilization: vision stops worsening and retinal fluid decreases. Others experience clearer vision over subsequent weeks or after a series of injections. It is also possible for vision to remain limited despite good control of fluid, especially when damage from the disease occurred before treatment began.

Ongoing treatment and monitoring offer the best opportunity to protect remaining vision. People should contact their eye-care team promptly if they notice sudden distortion, a new central dark spot, or a marked change in vision, as early reassessment may be needed.

Recovery, Aftercare and What Not to Do After an EYLEA Injection

Recovery from an Eylea injection is usually quick. Mild scratchiness, tearing, a gritty sensation, redness, and temporary blur can occur for a day or two. A small red patch on the white of the eye is common and may take longer to fade; it is usually caused by a small surface blood vessel and is not the same as bleeding inside the eye.

After the injection, people should avoid rubbing or pressing on the treated eye. They should not drive until their vision is clear enough to do so safely, particularly if dilating drops were used. It is also sensible to avoid getting unclean water, makeup, or other potential irritants directly into the eye until the clinician’s instructions allow. Patients should use prescribed drops only as directed and should not use leftover antibiotic or steroid drops unless advised.

Normal light activity is often possible the same day, but individual instructions may differ. A person should follow the eye specialist’s guidance about exercise, swimming, contact lenses, and work. If there is uncertainty about an activity, it is best to ask the treating clinic rather than relying on general advice.

Acibadem International’s multidisciplinary specialists and JCI-accredited hospitals support international patients needing assessment and treatment for retinal conditions, including eye treatment tailored to the individual diagnosis.

Risks, Benefits and When to Seek Medical Care

The potential benefit of Eylea is reduced retinal leakage and a better chance of maintaining or improving vision in appropriate conditions. However, all eye injections have risks. Common short-term effects include redness, irritation, floaters, tearing, light sensitivity, and blurred vision. A temporary rise in eye pressure can also occur after the injection.

Rare but serious complications include infection inside the eye, called endophthalmitis, retinal detachment, significant bleeding, inflammation, and injury to the lens. Anti-VEGF medicines may also have systemic safety considerations, particularly for people with a history of stroke, heart attack, or blood-clotting conditions. The treating doctor can explain how these considerations apply to the individual.

Urgent medical assessment is needed after an injection for increasing eye pain, worsening redness, marked light sensitivity, pus-like discharge, a sudden or substantial loss of vision, a curtain or shadow in the visual field, or a sudden increase in floaters or flashing lights. These symptoms do not always indicate a serious complication, but they should not be ignored.

People should also seek prompt eye care for new distortion or vision loss before their next planned visit. Timely review helps the specialist identify recurrent fluid, disease activity, or a complication and recommend appropriate next steps.

Frequently asked questions

How do you know EYLEA is working?

The clearest signs are usually seen during follow-up eye examinations and OCT retinal scans. Less retinal fluid, reduced swelling, stable vision, or improved vision can all indicate a response. Some people notice less distortion or clearer central vision, but symptoms alone do not reliably measure treatment success.

What not to do after an EYLEA injection?

Do not rub, press, or touch the treated eye with unwashed hands. Avoid driving until vision is clear enough to do so safely, and follow the clinician's advice about swimming, contact lenses, makeup, and strenuous activity. Do not use eye drops unless they were recommended by the treating eye specialist.

Does vision improve after EYLEA injection?

Vision may improve when the medicine reduces retinal fluid or leakage, but the outcome varies. Some people mainly achieve stable vision, which can still be an important result. Vision may not fully return when there has already been lasting damage to the retina or macula.

How long does it take to recover from an EYLEA injection?

Most people recover from the procedure itself within a day or two. Mild irritation, tearing, blur, or a scratchy sensation can occur briefly, while a small red patch on the white of the eye may last longer. Severe or worsening symptoms should be assessed urgently.

How often are EYLEA injections needed?

The schedule depends on the eye condition and how the retina responds on follow-up scans. Treatment may start at shorter intervals and later be extended if the eye remains stable, while some people require ongoing frequent injections. The ophthalmologist determines the safest schedule for each eye.

Can someone inject EYLEA at home?

No. Eylea is injected into the eye using sterile technique by a trained ophthalmologist or appropriately qualified eye-care clinician. Attempting to inject it at home could cause severe infection, injury, or vision loss.

References

• American Academy of Ophthalmology
• National Eye Institute
• U.S. Food and Drug Administration
• Royal College of Ophthalmologists
• European Medicines Agency

This article is for general information only and is not a substitute for professional medical advice. Please consult a qualified doctor about your individual situation.