Most people experience mild, short-lived discomfort and some temporary visual disturbances right after a steroid injection in the eye, with the treated eye gradually settling down over the first day or two. The injection itself takes only seconds, but the follow-up period matters: your eye doctor will monitor you for two well-known side effects, elevated eye pressure and cataract progression, both of which are manageable but worth understanding before your appointment.
What You See and Feel Right After the Injection
The needle used for an intravitreal injection is extremely fine, and the procedure is done under local anesthesia (usually numbing drops, sometimes a small anesthetic injection around the eye). Still, the moment after the injection can feel strange. A study of 75 eyes found that about a third of patients reported seeing floaters immediately afterward, and roughly a quarter saw flashes of light.1PubMed Central. Visual perceptions induced by intravitreous injections of therapeutic agents These visual effects are caused by the medication entering the gel-like vitreous humor inside your eye, and they generally fade within hours to a couple of days.
You can also expect some redness at the injection site and a gritty, irritated feeling for the rest of the day. A little tearing or watering is normal. If your doctor used an iodine-based antiseptic to sterilize the eye surface before the injection (which is standard), you might notice a yellowish tinge to your tears for a short time. Most people describe the pain during and after the procedure as mild to moderate. Research has found that anxiety levels play a real role in how much pain you feel: patients with higher state anxiety scores reported higher pain levels, and interestingly, smokers tended to report more pain than nonsmokers.2PubMed Central. Factors Associated with Pain Level in Patients Receiving Intravitreal Injection
Your doctor will usually ask you to stay for a few minutes afterward so they can check that the injection went smoothly and that your eye pressure hasn’t spiked. You can typically go home the same day. Most people return to normal activities within a day, though you may be told to avoid rubbing the eye or swimming for a short period.
Why Steroid Injections Are Used in the Eye
Steroid injections into the eye are used to treat conditions where swelling, inflammation, or abnormal blood vessel growth threatens your vision. The most common reasons include diabetic macular edema, macular edema from retinal vein occlusion, certain types of age-related macular degeneration, and non-infectious uveitis (inflammation inside the eye).3PubMed Central. Intravitreal steroids for the treatment of retinal diseases These conditions all involve swelling or inflammation in the retina, the light-sensitive tissue at the back of your eye. Left untreated, they can cause serious, sometimes permanent, vision loss.
Corticosteroids work against these problems on multiple fronts: they reduce inflammation, decrease swelling, and inhibit the growth of abnormal blood vessels.4Survey of Ophthalmology. Intravitreal Steroids for Macular Edema: The Past, the Present, and the Future Injecting the steroid directly into the eye delivers a concentrated dose right where it is needed, which avoids flooding the rest of your body with the drug. Among the conditions that respond best to this approach are diffuse diabetic macular edema, branch and central retinal vein occlusion, pseudophakic cystoid macular edema (swelling that develops after cataract surgery), and various forms of non-infectious uveitis.5PubMed. Intravitreal triamcinolone acetonide for treatment of intraocular oedematous and neovascular diseases
Types of Steroid Injections and How Long They Last
Not all intravitreal steroid treatments are the same. The three you are most likely to encounter are triamcinolone acetonide, the dexamethasone implant (often known by the brand name Ozurdex), and the fluocinolone acetonide implant (often known as Iluvien or Retisert). They differ in how they release medication and how long they remain active.
Triamcinolone acetonide is a liquid suspension injected directly into the vitreous. It is the oldest and least expensive option. The drug particles gradually dissolve over several weeks. Different formulations of triamcinolone exist, and they can behave slightly differently in terms of side effects. One study comparing three formulations found that sterile inflammation rates varied: one brand showed a rate of about 5% while a preservative-free compounded version came in under 1%.6PubMed Central. Sterile endophthalmitis rates and particle size analyses of different formulations of triamcinolone acetonide Your doctor’s choice of formulation can therefore affect your experience.
The dexamethasone implant is a tiny biodegradable rod, about the size of a grain of rice, inserted into the eye through an applicator. Dexamethasone concentrations peak at around two months, and more than 90% of the implant dissolves by three months, with the overall therapeutic effect lasting up to about six months.7PubMed Central. Retained, Non-Dissolving, Tubular Foreign Bodies in the Vitreous Cavity after Intravitreal Dexamethasone (Ozurdex) Implantation Because the implant breaks down on its own, it does not need to be removed. If the implant fragments inside the eye, research shows the pieces release medication at the same rate as an intact implant, so fragmentation is not a concern.8PubMed Central. Comparison of the release profile and pharmacokinetics of intact and fragmented dexamethasone intravitreal implants in rabbit eyes
The fluocinolone acetonide implant is designed for much longer use. It releases a very low dose of steroid continuously for up to three years, making it a good option for people with chronic conditions like non-infectious posterior uveitis who would otherwise need frequent re-injections. Over a 36-month period, the fluocinolone implant has been associated with fewer episodes of uveitis recurrence, longer time between flare-ups, and improved visual acuity compared to standard care.9PubMed Central. Preventing relapse in non-infectious uveitis affecting the posterior segment of the eye – evaluating the 0.2 μg/day fluocinolone acetonide intravitreal implant (ILUVIEN®) Real-world data have confirmed these benefits hold up outside of clinical trials as well.10PubMed Central. The effectiveness of the 0.19 mg fluocinolone acetonide implant in treating non-infectious posterior uveitis: a real-world experience The trade-off is that side effects like pressure elevation and cataract progression accumulate over that longer timeframe, so closer monitoring is necessary.
Elevated Eye Pressure
This is probably the side effect you will hear the most about, and for good reason: it happens fairly often. In a study of 428 eyes treated with various intravitreal steroids, about 39% developed elevated intraocular pressure, typically appearing at a median of around five and a half months after treatment.11PubMed Central. Incidence and treatment approach of intraocular pressure elevation after various types of local steroids for retinal diseases The rate varied depending on which steroid was used and whether drugs were combined, ranging from about 39% with dexamethasone alone up to about 57% when triamcinolone and dexamethasone were combined.
The reassuring part is that most cases are controllable. In that same study, about 71% of pressure elevations were managed with eye drops alone, and roughly 69% of those patients achieved adequate pressure control with topical therapy. Only about 13% of the elevated-pressure cases needed a surgical procedure.11PubMed Central. Incidence and treatment approach of intraocular pressure elevation after various types of local steroids for retinal diseases Data from diabetic macular edema trials similarly show that pressure-lowering drops are sufficient for the large majority of patients.12PubMed Central. Elevated Intraocular Pressure After Intravitreal Steroid Injection in Diabetic Macular Edema: Monitoring and Management
With the dexamethasone implant specifically, repeated injections do not seem to dramatically increase the risk each time. A four-year study tracking patients through multiple rounds of the implant found that about 5% developed elevated pressure after the first injection, with additional small percentages after the second and third rounds. All of those cases were managed with drops alone.13PubMed Central. Effects of Repeated Intravitreal Injections of Dexamethasone Implants on Intraocular Pressure: A 4-Year Study Still, your doctor will check your eye pressure at every follow-up visit, and you should not skip those appointments. Uncontrolled high pressure inside the eye can damage the optic nerve and lead to glaucoma.
Cataract Progression
If you still have your natural lens (meaning you haven’t had cataract surgery), steroid injections into the eye will accelerate cataract formation over time. This is not a question of “if” so much as “when” and “how fast,” especially with repeated injections. The type of cataract most strongly linked to steroids is a posterior subcapsular cataract, which forms on the back surface of the lens.
A controlled study comparing triamcinolone-injected eyes with untreated eyes found that even a single injection caused significantly more posterior subcapsular cataract progression. Multiple injections made the difference substantially larger and also affected the nuclear (central) portion of the lens.14American Journal of Ophthalmology. Cataract Progression After Intravitreal Triamcinolone Injection In rare cases, progression can be dramatic: one case report documented a patient whose lens went from mild clouding to a fully mature cataract just three weeks after a dexamethasone implant.15PubMed Central. Rapid progression of cataract to mature stage after intravitreal dexamethasone implant injection: a case report That is an extreme case, but it underscores why monitoring matters.
The silver lining is that cataracts are surgically treatable, and cataract surgery after intravitreal steroid injections follows a well-established pathway. A case series of 22 patients who developed cataracts after triamcinolone injections underwent successful cataract removal.16Eye. Cataract surgery after intravitreal injection of triamcinolone acetonide If you are already pseudophakic (you already have an artificial lens from prior cataract surgery), this particular side effect is a non-issue for you.
Rare but Serious Complications
Two rare complications deserve mention because, while uncommon, they require urgent attention if they occur: endophthalmitis (infection inside the eye) and retinal detachment.
Endophthalmitis after intravitreal steroid injection comes in two forms. True bacterial infection is the most feared. One large study of 922 triamcinolone injections found an incidence of about 0.9%, with patients typically presenting around a week after the injection with pain, redness, pus in the front of the eye (hypopyon), and worsened vision.17American Journal of Ophthalmology. Acute endophthalmitis following intravitreal triamcinolone acetonide injection The other type is sterile endophthalmitis, an inflammatory reaction that mimics infection but involves no actual bacteria. This typically appears within the first two days, often resolves on its own, and is thought to be a reaction to the drug particles or preservatives rather than an infection.18Retina. INFECTIOUS AND PRESUMED NONINFECTIOUS ENDOPHTHALMITIS AFTER INTRAVITREAL TRIAMCINOLONE ACETONIDE INJECTION The tricky part is that the two can look similar early on. If you notice increasing pain, significant redness, or a sudden drop in vision in the days after your injection, contact your doctor immediately. The distinction between the two is made in the clinic, not at home.
Retinal tears and retinal detachment from the injection itself are exceptionally rare. A large analysis found that retinal breaks or detachments occurred in fewer than 0.08% of injections.19PubMed Central. Retinal tears and rhegmatogenous retinal detachment after intravitreal injections: its prevalence and case reports Another study of over 180,000 injections calculated a rate of about one retinal detachment per 7,500 injections, and found that when tears did occur, they were often in the same quadrant where the needle had entered.20PubMed. Rhegmatogenous Retinal Detachment after Intravitreal Injection of Anti-Vascular Endothelial Growth Factor Warning signs include a sudden increase in floaters, flashes of light, or a shadow or curtain creeping across your visual field. Any of these warrant a same-day call to your ophthalmologist.
Why the Injection Stays Local
One of the advantages of injecting steroid directly into the eye is that very little medication reaches the rest of your body. The eye is tiny relative to overall body volume, so the dose required is minuscule compared to what you would need if you took the steroid orally. Systemic steroid therapy for eye conditions carries the risk of suppressing your whole immune system and causing problems like weight gain, bone thinning, or Cushing’s syndrome. An intravitreal injection largely sidesteps those risks because the drug stays concentrated where it is needed.21British Journal of Ophthalmology. Intravitreal injection of triamcinolone acetonide as treatment for chronic uveitis For patients with uveitis in particular, a single intravitreal injection of triamcinolone has been shown to provide inflammation control comparable to a course of oral steroids taken around surgery, with far fewer systemic side effects.22PubMed. Intravitreal versus Oral Steroids for Inflammation Control in Uveitic Patients Undergoing Cataract Surgery
That said, the two main ocular side effects described above, pressure elevation and cataract progression, are real trade-offs of this localized approach. The steroid is concentrated in the eye, so the eye bears the full brunt of steroid-related effects. Your doctor weighs these risks against the threat the underlying disease poses to your vision.
Managing Anxiety Around the Procedure
Getting a needle in your eye sounds terrifying, and many patients feel genuine anxiety beforehand. Research bears this out: in one study, about 44% of patients scored in the clinically anxious range before their injection.23PubMed Central. Anxiety Levels Before Intravitreal Injections The good news is that anxiety tends to decrease with experience. That same study found a clear negative correlation between the number of previous injections and anxiety levels, meaning the more injections you have had, the less anxious you tend to feel about the next one.
Younger patients tend to report more anxiety than older ones. If you are dreading the procedure, some practical strategies have been shown to help. A survey of patients who had undergone intravitreal injections identified several comfort measures that more than half of patients endorsed:
- Staff presence: having a technician or assistant in the room during the procedure
- Neck pillow: supporting the head and neck so you can relax more fully
- Verbal warning: having the doctor tell you just before the injection happens, so you are not caught off guard
- Same-day bilateral injections: if both eyes need treatment, getting them done in one visit rather than returning twice
Some patients, particularly women and those who had already been through many rounds, also found holding someone’s hand or squeezing a stress ball helpful.24PubMed Central. Strategies for Improving Patient Comfort During Intravitreal Injections: Results from a Survey-Based Study These are simple things, but they can meaningfully change the experience. It is worth asking your clinic what comfort options they offer.
The Cost and Frequency Question
Because many of the conditions treated with intravitreal steroids are chronic, you may need multiple injections over months or years. How often you return depends on which steroid is used and how your eye responds. Triamcinolone typically needs to be repeated every few months. The dexamethasone implant lasts up to about six months before a new one is needed. The fluocinolone implant can last up to three years, which dramatically reduces the number of clinic visits.
From a cost perspective, steroid injections are generally less expensive per injection than the anti-VEGF drugs (like ranibizumab or aflibercept) that are the other main category of intravitreal treatment. A healthcare cost analysis comparing the dexamethasone implant with anti-VEGF therapies for diabetic macular edema found that one-year costs for dexamethasone fell in between the cheapest and most expensive anti-VEGF options, though the exact ranking depended on whether the patient was treatment-naive or switching from a prior therapy.25PubMed Central. Healthcare expenditure of intravitreal anti-vascular endothelial growth factor inhibitors compared with dexamethasone implant for diabetic macular oedema For patients with chronic conditions requiring long-term control, the fluocinolone implant has been found cost-effective compared to both usual care and dexamethasone over a 15-year time horizon in a UK analysis.26PubMed Central. Cost-effectiveness of fluocinolone acetonide implant (ILUVIEN®) in UK patients with chronic diabetic macular oedema considered insufficiently responsive to available therapies The fewer clinic visits and repeat procedures you need, the lower the cumulative cost and the smaller the disruption to your life.
When to Call Your Doctor
After your injection, you will be given specific follow-up instructions, but a few warning signs always warrant an urgent call regardless of how many injections you have had before. Severe or rapidly worsening pain in the first few days is the most important red flag, as it can signal infection. A sudden increase in floaters or flashes of light, a new shadow or curtain in your peripheral vision, or a marked drop in your ability to see clearly are all signs that something may need immediate attention. Redness and mild discomfort that are gradually improving over the first day or two are normal; redness and pain that are getting worse after the first day are not.
Your scheduled follow-up visits, typically within a few weeks of the injection, are important even if everything feels fine. Elevated eye pressure often produces no symptoms at all in its early stages, and your doctor needs to measure it with instruments in the office. The same goes for cataract progression, which tends to be gradual and easy to miss until it starts affecting your daily vision. Keeping those appointments is one of the most important things you can do to protect your eyesight over the course of treatment.