Yes, steroids can cause glaucoma. They do so by raising the pressure inside your eye, and the risk depends on the type of steroid, how it’s delivered, and your individual sensitivity. About one-third of people experience a moderate pressure increase when using steroid eye drops, while 4% to 6% are “high responders” whose eye pressure spikes to potentially dangerous levels. The good news: most cases are reversible if caught early, and not all steroids carry equal risk.
How Steroids Raise Eye Pressure
Your eye constantly produces a clear fluid that nourishes its internal structures, then drains that fluid through a tiny mesh-like tissue near the front of the eye. This drainage system keeps the pressure inside your eye stable. Steroids damage this system in several ways: they cause extra material to build up in the drainage mesh, the mesh cells die off, and the drainage channels narrow and thicken. The result is that fluid gets trapped, pressure builds, and the optic nerve at the back of the eye starts taking damage. This is glaucoma.
These changes are essentially the same ones that happen in the most common form of glaucoma (open-angle glaucoma) that develops with age. The difference is that steroids can accelerate the process dramatically, sometimes in just a few weeks.
Who Is Most Sensitive
Not everyone’s eyes respond to steroids the same way. Classic studies using potent steroid eye drops divided people into three groups based on how their eye pressure changed over four to six weeks:
- Non-responders (about 60% to 66% of people): Eye pressure stays below 20 mmHg or rises less than 6 mmHg. No significant concern.
- Moderate responders (about 29% to 36%): Pressure rises 6 to 15 mmHg. Worth monitoring but not usually dangerous during short courses.
- High responders (4% to 6%): Pressure jumps more than 15 mmHg, often exceeding 31 mmHg. This is the group at real risk for optic nerve damage.
You’re more likely to be a high responder if you already have open-angle glaucoma, have a family history of glaucoma, are highly nearsighted, have type 1 diabetes, or are very young (children are particularly susceptible). People with connective tissue disorders are also at higher risk. There’s no simple test to predict your response before starting steroids, which is why eye pressure monitoring matters during treatment.
Which Forms of Steroids Carry the Most Risk
Steroid eye drops pose the highest risk because they deliver the drug directly to the eye’s drainage tissue. Potent formulations like dexamethasone and prednisolone are the worst offenders. Steroid injections around or inside the eye also carry significant risk, and the pressure increase can be harder to manage because the drug can’t simply be stopped and washed away.
Oral steroids (pills like prednisone) can raise eye pressure too, particularly with long-term use at higher doses. The risk is lower than with eye drops but still real, especially in people who are already predisposed.
Inhaled steroids for asthma, on the other hand, appear to be far less concerning than previously thought. A large meta-analysis of 18 studies covering over 31,000 people found no significant increase in glaucoma risk from inhaled steroids. Eye pressure changed by an average of just 0.01 mmHg during treatment, which is essentially zero. Even long-term, high-dose inhaled steroid use in children followed for an average of nearly 16 years showed no adverse effects on eye pressure in adulthood. If you use an inhaler for asthma or COPD, this is reassuring: the glaucoma warnings on inhaled steroids appear to be overstated.
Not All Steroid Eye Drops Are Equal
Newer “soft” steroid eye drops were specifically designed to reduce the pressure problem. Loteprednol, for example, controls inflammation about as well as prednisolone after cataract surgery but causes meaningfully less pressure increase. In a study of known steroid responders (people already identified as sensitive), prednisolone raised eye pressure by an average of 9 mmHg over six weeks, while loteprednol raised it by only 4.1 mmHg. By day 14, the prednisolone group already had a significant pressure spike. The loteprednol group’s increase wasn’t even statistically different from their baseline.
Fluorometholone and rimexolone also cause less pressure elevation than the older, more potent drops. In steroid responders, prednisolone raised pressure by 12.1 mmHg on average, while rimexolone caused 6.2 mmHg and fluorometholone just 3.5 mmHg. The time it took for pressure to start climbing was also significantly longer with these gentler options (compared to about 2.5 to 3 weeks with dexamethasone or prednisolone). If you need anti-inflammatory eye drops and you know you’re a steroid responder, these alternatives are worth discussing.
How Quickly Pressure Can Rise
With potent steroid eye drops, pressure increases typically show up within two to six weeks. High responders tend to spike sooner and more dramatically. With oral or injected steroids, the timeline can stretch longer, sometimes weeks to months. Steroid implants placed inside the eye for conditions like macular swelling can cause sustained pressure elevation for months because the drug slowly releases over time.
The speed matters because steroid-induced glaucoma often produces no symptoms until real damage has occurred. You won’t feel the pressure building. There’s no pain, no blurred vision in the early stages. By the time you notice vision changes, some optic nerve damage may be permanent. This is why regular eye pressure checks during steroid treatment are so important, particularly in the first several weeks.
Reversibility and Treatment
The most important thing to know about steroid-induced glaucoma is that it’s usually reversible. In most cases, stopping the steroid or switching to a less potent formulation brings eye pressure back to normal within days to weeks. If the steroid can’t be stopped (because the underlying condition requires it), pressure-lowering eye drops can typically control the situation.
The picture is different when steroid use has been prolonged and the drainage tissue has sustained lasting structural damage. In these cases, the pressure elevation may persist even after the steroid is discontinued, and the condition behaves more like chronic open-angle glaucoma requiring ongoing treatment. Rarely, surgery to improve fluid drainage becomes necessary when medications alone can’t control the pressure.
Any optic nerve damage that occurred before the pressure was brought down is permanent. Glaucoma doesn’t give back lost vision. That’s what makes early detection the whole game: catch the pressure rise before nerve damage happens, and you walk away with no lasting harm.