Intravitreal Injection: What to Expect During Treatment
What Intravitreal Injections Are Used For
Intravitreal injections treat conditions that affect the retina and the structures at the back of your eye. By placing medication exactly where it is needed, we can achieve higher concentrations of the drug at the disease site than oral or intravenous medications could provide.
Wet AMD (age-related macular degeneration) occurs when abnormal blood vessels grow beneath the retina and leak fluid or blood, threatening central vision. Anti-VEGF injections block the protein that drives this abnormal vessel growth, helping to stabilize or improve vision in many patients. AMD is the leading cause of irreversible vision loss among adults over age 50 in the developed world (American Academy of Ophthalmology). Wet AMD is one of the most common reasons intravitreal injections are prescribed, and consistent treatment is essential to maintaining results.
Diabetes can damage the small blood vessels in the retina, leading to swelling in the macula (diabetic macular edema) or abnormal blood vessel growth (proliferative diabetic retinopathy). Approximately one in three people with diabetes over age 40 has some degree of diabetic retinopathy (National Eye Institute). Intravitreal injections reduce this swelling and slow disease progression. For many patients with diabetic eye disease, regular injections are a cornerstone of preserving functional vision.
A retinal vein occlusion happens when a vein carrying blood away from the retina becomes blocked, causing fluid leakage and swelling. Intravitreal injections help control the resulting macular edema and reduce the risk of complications such as abnormal new blood vessel formation. Treatment frequency depends on how quickly the eye responds and whether swelling recurs.
Beyond the conditions above, intravitreal injections can also be used to treat certain forms of uveitis (inflammation inside the eye), macular edema from other causes, and select cases of retinal infection. Our retina specialists evaluate each patient individually to determine whether an intravitreal injection is the most appropriate approach.
Does the Injection Hurt
One of the most common concerns patients have is whether an intravitreal injection is painful. The short answer is that most patients experience only mild pressure or a brief sensation during the procedure, not the sharp pain they may anticipate.
Before the injection, we apply numbing drops or a small amount of anesthetic gel to the surface of your eye. Some practices also use a cotton-tipped applicator soaked in anesthetic at the injection site. These methods effectively eliminate sharp pain, so the majority of patients describe the sensation as brief pressure lasting only a few seconds.
Once your eye is fully numb, you may notice a slight pressure sensation as the very fine needle enters the eye. Some patients report feeling a mild sting when the medication is released. The entire injection takes only a few seconds, and any discomfort typically resolves within minutes.
It is completely normal to feel nervous before your first injection. Knowing that the needle used is extremely thin and the procedure is brief can help put your mind at ease. We encourage patients to take slow, deep breaths and focus on a fixed point during the injection. If you experience significant anxiety, let our team know ahead of time so we can take additional steps to help you feel comfortable.
How an Intravitreal Injection Is Performed
The injection follows a carefully standardized protocol designed to maximize safety and minimize discomfort. Understanding each step can help you feel more prepared on the day of your appointment.
When you arrive, we begin by dilating your pupil with eye drops so we can examine the retina before and after the injection. We then clean the skin around your eye and apply an antiseptic solution, typically povidone-iodine, to the eye surface. This step is critical for reducing the risk of infection. A small device called a lid speculum may be placed to gently hold your eyelids open.
After confirming that your eye is fully numb, our retina specialists use a very fine-gauge needle to inject the medication through the pars plana, a safe zone in the white part of your eye located a few millimeters behind the cornea. The pars plana provides a clear path into the vitreous cavity without contacting the retina or the lens. The injection itself takes only a few seconds.
Once the medication has been delivered, the speculum is removed and your eye may be rinsed with a sterile solution. We check your eye pressure and use a light to confirm that the central retinal artery is still circulating blood properly. You may notice floaters, mild redness, or a slight scratchy sensation for a few hours. We provide you with aftercare instructions and antibiotic drops if indicated before you leave.
In most cases, a follow-up examination is scheduled within a few weeks to assess how your eye is responding to the medication. During this visit, our retina specialists use optical coherence tomography (OCT) and other imaging to check for changes in fluid levels or retinal thickness. Your treatment plan may be adjusted based on these findings.
What Medications Are Injected Into the Eye
Several categories of medication can be delivered through intravitreal injection. The choice depends on your specific diagnosis, how your eye has responded to previous treatments, and the latest clinical evidence.
Anti-VEGF (vascular endothelial growth factor) drugs are the most commonly injected medications. They work by blocking a protein that triggers the growth of abnormal, leaky blood vessels in the retina. Widely used anti-VEGF agents include ranibizumab (Lucentis), aflibercept (Eylea), bevacizumab (Avastin), and faricimab (Vabysmo). Each has slightly different properties, including how long it remains active in the eye, which helps us tailor the treatment interval to your needs.
Injectable corticosteroids, such as triamcinolone acetonide or the dexamethasone implant (Ozurdex), reduce inflammation and macular swelling. They are often considered for patients who do not respond adequately to anti-VEGF therapy alone, or for certain inflammatory conditions like uveitis. Because corticosteroids can raise eye pressure or accelerate cataract formation, we monitor these factors closely when using them.
Newer medications now target different pathways involved in retinal disease. Complement inhibitors such as pegcetacoplan (Syfovre) and avacincaptad pegol (Izervay) have been approved for geographic atrophy, an advanced form of dry macular degeneration. Research continues to expand the range of conditions treatable through intravitreal delivery, and our retina specialists stay current with these advances to offer you the most effective options.
Frequently Asked Questions
Treatment frequency varies based on your condition and how your eye responds. Many patients begin with monthly injections for the first few months, then transition to a treat-and-extend schedule where the interval between injections is gradually lengthened. Some conditions require ongoing treatment over months or years, while others may stabilize enough to allow longer breaks between visits.
Intravitreal injections are considered safe, but like any medical procedure they carry some risks. The most serious, though rare, complication is endophthalmitis, an infection inside the eye that occurs in roughly 1 in 2,000 to 1 in 5,000 injections. Other possible side effects include temporary eye redness, mild soreness, floaters, a small subconjunctival hemorrhage (a red spot on the white of the eye), and transient elevated eye pressure. Contact us immediately if you experience significant pain, worsening vision, or increasing redness after an injection.
The entire office visit typically lasts 30 to 60 minutes, including check-in, pre-injection preparation, the procedure itself, and a brief post-injection evaluation. The actual injection takes only a few seconds. Most of the appointment time is spent on dilation, cleaning, and the safety checks performed before and after the injection.
Before your appointment, continue taking any prescribed eye drops or medications unless our retina specialists instruct otherwise. Avoid wearing eye makeup on the day of your injection. After the procedure, do not rub your eye and use any prescribed antibiotic drops as directed. You can resume most normal activities the same day, though you should avoid swimming or submerging your face in water for a few days to reduce infection risk.
Most patients can drive themselves home after an injection, though your vision may be temporarily blurry from the dilating drops or the medication itself. If this is your first injection and you are unsure how your vision will be affected, arranging a ride home is a reasonable precaution. By the following day, your vision should return to its baseline.
Missing an injection can allow your condition to worsen, particularly for diseases like wet AMD or diabetic macular edema where fluid can reaccumulate quickly. If you miss an appointment, contact us as soon as possible to reschedule. In many cases, resuming treatment promptly can prevent significant setbacks. Consistent follow-through with your injection schedule gives you the best chance of maintaining or improving your vision over time.
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