Avastin Eye Injection: How It Works, Results and What to Expect

An Avastin eye injection is an anti-VEGF treatment that can reduce fluid leakage and abnormal blood vessel growth in the retina. It is a brief outpatient procedure, and most people return to usual activities within a day while attending scheduled eye follow-up visits.

Overview: What Is an Avastin Eye Injection?

An Avastin eye injection is a treatment in which bevacizumab, the active medicine in Avastin, is injected into the vitreous, the clear gel inside the eye. It is used by retinal specialists to reduce the effects of vascular endothelial growth factor (VEGF), a protein that can cause fragile abnormal blood vessels to grow or fluid to leak into the retina.

By reducing VEGF activity, treatment may lessen retinal swelling, reduce bleeding or leakage, and help preserve vision. The injection is usually performed in an outpatient clinic under local anaesthetic eye drops. Although the procedure itself is brief, the overall care plan includes eye examinations and retinal imaging to guide the timing of future treatment.

In eye care, bevacizumab is commonly used off-label, meaning it is prescribed based on clinical evidence and specialist judgement rather than a specific regulatory approval for every eye condition. A retinal specialist can explain why it is appropriate in an individual situation and discuss alternative anti-VEGF medicines when relevant.

How Avastin Works and Who May Be a Candidate

VEGF helps form new blood vessels. In some retinal diseases, too much VEGF leads to blood vessels that are abnormal and prone to leaking. Leakage can cause swelling in the macula, the central part of the retina responsible for detailed vision. Avastin binds to VEGF and limits its effects, which can help the retina dry and stabilize.

Specialists may recommend an Avastin eye injection for wet age-related macular degeneration, diabetic macular edema, diabetic retinopathy, macular edema caused by retinal vein occlusion, or abnormal blood vessels related to other retinal disorders. It may also be used before certain retinal surgeries in selected cases.

Candidacy depends on the diagnosis, retinal scan findings, current vision, previous treatment response and overall health. The eye is examined for active infection or inflammation before an injection. People should tell their eye doctor about pregnancy, breastfeeding, allergies, recent illness, anticoagulant medicines and any prior eye surgery or injection reactions.

Avastin is one option within a wider group of medicines known as anti-VEGF therapy. Treatment decisions are individualized because the expected benefit, treatment interval and suitable medicine can differ between retinal conditions and between individuals.

What Happens During the Avastin Eye Injection Procedure?

Before the procedure, the eye care team checks the treatment eye and may measure vision and eye pressure. Dilating drops and optical coherence tomography (OCT), a non-invasive retinal scan, are often used at appointments to assess fluid and retinal structure. The skin around the eye is cleaned, and antiseptic drops are placed on the surface of the eye to lower the risk of infection.

Numbing drops, and sometimes additional local anaesthetic, are used so that most people feel pressure rather than pain. A small eyelid device may be used to help keep the eye open. The specialist then gives the injection through the white part of the eye. The injection takes only seconds.

Afterward, the eye may be checked briefly, including vision or eye pressure when indicated. The person can usually go home the same day. Vision may be temporarily blurry from dilating drops, tears or air bubbles, so arranging transport home is sensible.

The specialist provides individual aftercare instructions and schedules follow-up. For people who need ongoing retinal treatment, appointments may be monthly at first or spaced further apart according to retinal imaging, symptoms and disease activity.

Benefits, Limitations and Possible Risks

The main goal of an Avastin eye injection is to protect vision by controlling leakage and abnormal blood vessel activity. Some people notice clearer or more stable vision as fluid decreases, while others may primarily experience prevention of further sight loss. The degree of benefit depends on the underlying diagnosis, how long the retina has been affected and the condition of the macula and optic nerve.

Avastin does not reverse every type of retinal damage, and it usually does not provide a permanent one-time cure. Many retinal conditions need repeated treatment and monitoring. Regular visits are important even when vision seems stable, because retinal fluid or blood vessel activity can return before symptoms become obvious.

Common short-term effects include mild eye discomfort, a gritty sensation, tearing, light sensitivity, a small red area on the white of the eye, and temporary floaters or blurred vision. These often improve over several hours to a few days.

Serious complications are uncommon but can include infection inside the eye, retinal tear or detachment, significant bleeding, raised eye pressure, inflammation or cataract progression. Systemic complications are considered when anti-VEGF therapy is prescribed, particularly in people with vascular health concerns, although the amount used in the eye is small. A clinician can discuss personal risks and benefits before treatment.

How Can You Tell if Avastin Is Working?

Improved or more stable central vision can be a sign that Avastin is helping, but symptoms alone do not give the full picture. Some people notice less distortion, fewer blurred areas or improved ability to read and recognize faces. Others may not notice an immediate change despite a meaningful improvement in retinal swelling.

The most reliable assessment is made by the retinal specialist using vision testing and OCT imaging. The scan can show whether fluid in or under the retina has reduced, remained stable or returned. In some conditions, photographs or dye-based imaging may also help assess abnormal blood vessels and bleeding.

Response can take time and may require several injections. If there is little improvement, the doctor may review the diagnosis, injection schedule, disease activity and whether a different anti-VEGF medicine or another treatment approach is appropriate. Patients should continue scheduled monitoring rather than judging success only by day-to-day vision changes.

What Not to Do After Avastin Eye Injection?

For the rest of the day, people should avoid rubbing or pressing on the treated eye. They should also avoid driving until their vision is clear enough to do so safely, as dilating drops and temporary blur can affect visual function. Hands should be washed before using any prescribed eye drops.

Unless the eye specialist gives different instructions, normal light activity can usually resume the next day. It is generally sensible to avoid swimming pools, hot tubs and potentially unclean water around the eye for a short period, because the eye surface may be irritated after the procedure. Eye makeup and contact lens use should follow the clinic’s specific advice.

People should not stop prescribed systemic medicines, including blood thinners, unless the clinician managing those medicines advises it. A small red patch on the white of the eye may look noticeable but is often harmless. However, worsening redness with pain, light sensitivity or reduced vision should not be assumed to be routine irritation.

How Long Does It Take to Recover From an Avastin Eye Injection?

Most people recover from the procedure itself within one to two days. Mild scratchiness, watering, a red spot and temporary floaters are common in the first hours or days. Blurred vision caused by dilation or surface irritation often improves by the following day, although the underlying retinal condition may take longer to respond.

The timeline for visual improvement varies widely. When retinal swelling is present, improvement may become noticeable over days to weeks, but some eyes need repeated injections before the retina is adequately dry or vision stabilizes. In longstanding disease, treatment may prevent deterioration even if vision does not noticeably improve.

Recovery should be monitored against the specialist’s plan rather than compared with another person’s experience. Retinal imaging at follow-up appointments helps determine whether the eye is responding and whether further injections are needed.

Acibadem International’s multidisciplinary specialists and JCI-accredited hospitals provide assessment and treatment planning for international patients with retinal conditions, including anti-VEGF injection care when clinically appropriate.

What Is the Success Rate of Avastin Eye Injection?

There is no single success rate for Avastin eye injection because outcomes depend on the condition being treated, its severity, the timing of treatment and the person’s retinal health. In clinical practice, success may mean reduced retinal fluid, stable vision, improved vision, or a lower risk of future vision loss. These are different outcomes and should not be treated as interchangeable.

Many people with VEGF-related retinal disease benefit from anti-VEGF treatment, particularly when they receive monitoring and injections as recommended. However, not every eye responds in the same way, and some people require frequent ongoing treatment. Vision that has already been lost from permanent scarring or retinal damage may not fully return.

A retinal specialist can offer the most meaningful estimate after reviewing OCT scans, vision tests and the specific diagnosis. Follow-up results after the first injections often provide more useful individualized information than a general percentage.

When to Seek Medical Care

Contact the treating eye clinic promptly if discomfort, redness or blurred vision is not improving as expected. Seek urgent eye assessment for increasing eye pain, marked redness, worsening light sensitivity, a sudden decrease in vision, increasing floaters, flashing lights, or a curtain-like shadow in the vision. These symptoms can indicate a complication that needs timely evaluation.

Patients should also contact their care team if they develop symptoms of an allergic reaction or have concerns about prescribed aftercare. It is better to ask about a worrying symptom early than to wait for the next routine appointment.

New distortion, blurred central vision or unexplained vision loss should be assessed by an eye professional even in people who have not had injections before. Early evaluation can help identify retinal problems that may benefit from treatment.

Frequently asked questions

Is an Avastin eye injection painful?

Numbing drops are used before the injection, so most people feel pressure or a brief sensation rather than significant pain. Mild irritation or a scratchy feeling afterward is common and usually temporary. Increasing pain should be reported promptly to the eye clinic.

How often are Avastin eye injections needed?

The frequency depends on the retinal condition and how the eye responds on examination and OCT imaging. Some people start with injections at regular monthly intervals, while others can extend the time between treatments once the condition is stable. The specialist adjusts the plan individually.

Can vision be blurry after an Avastin eye injection?

Yes. Temporary blurred vision can occur from dilating drops, tear film changes, surface irritation or floaters after the injection. It often improves within hours to a day, but sudden or worsening vision loss requires urgent medical advice.

Can I work after an Avastin eye injection?

Many people can return to non-strenuous work the following day. It is best to avoid driving or tasks requiring sharp vision until the eye feels comfortable and vision is clear. The treating team may give additional advice based on the eye condition and type of work.

Does Avastin cure macular degeneration or diabetic eye disease?

Avastin can control abnormal blood vessel growth and fluid leakage, but it does not cure the underlying retinal disease. Ongoing monitoring is important because disease activity can return. Treatment can help protect vision and, in some cases, improve it.

What symptoms after an Avastin injection are an emergency?

Urgent assessment is needed for severe or increasing eye pain, worsening redness, marked light sensitivity, sudden vision loss, new flashing lights, many new floaters or a shadow or curtain in the field of vision. These are not symptoms to wait on until the next appointment. Contact the treating eye service or seek urgent eye care.

References

• American Academy of Ophthalmology
• National Eye Institute
• National Institute for Health and Care Excellence
• Royal College of Ophthalmologists

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.