Nasal sprays, particularly steroid-based ones like fluticasone and mometasone, are not a known cause of eye floaters. In clinical trials involving thousands of patients, intranasal corticosteroids showed no significant increase in the types of eye changes that produce floaters. That said, there is a narrow, indirect pathway worth understanding if you’re a long-term user.
What Actually Causes Eye Floaters
Floaters are shadows cast on your retina by tiny clumps or strands floating inside the gel-like substance (called the vitreous) that fills your eye. The most common cause is posterior vitreous detachment, where that gel gradually shrinks and pulls away from the back of the eye. This is largely an age-related process, becoming increasingly common after age 50, though it can happen earlier in people who are nearsighted, have had eye surgery, or have experienced eye trauma.
Other causes include bleeding inside the eye from a retinal tear, inflammation from eye infections, and, rarely, certain injected medications. None of these causes are linked to nasal spray use.
How Steroid Nasal Sprays Affect the Eyes
The concern around nasal sprays and eye problems comes from the fact that corticosteroids, as a drug class, can raise pressure inside the eye. Steroid eye drops are well known for this effect. Nasal sprays deliver a much smaller dose, and very little of it reaches the eye. But because the nasal passages sit close to the eye’s drainage system, the question of whether some steroid could migrate there is reasonable.
A systematic review and meta-analysis looking at over 2,800 patients found the numbers reassuring. The increased rate of elevated eye pressure in people using intranasal corticosteroids compared to placebo was just 0.8%. There were zero cases of glaucoma in either group at 12 months. The rate of developing a specific type of lens clouding (posterior subcapsular cataract) was 0.02% higher than placebo, a difference that was not statistically significant. A separate meta-analysis also found no significant difference in eye pressure elevation between corticosteroid users and non-users overall.
The Indirect Connection to Floaters
While nasal sprays don’t directly cause floaters, there is one theoretical chain of events worth knowing about. If a steroid nasal spray were to raise your eye pressure significantly over a long period, and that pressure increase went undetected, it could eventually contribute to secondary glaucoma. Cleveland Clinic lists a sudden appearance or increase in floaters as one possible symptom of acute glaucoma, alongside eye pain and pressure changes.
This scenario is extremely unlikely with nasal sprays at standard doses. The clinical data shows the eye pressure increase, when it occurs at all, is small. But it’s the reason you’ll sometimes see glaucoma and cataracts mentioned in the fine print of steroid nasal spray packaging. FDA guidance documents for these products list pre-existing glaucoma and cataracts as exclusion criteria for clinical studies, which reflects caution rather than a documented pattern of harm.
Who Might Have Higher Risk
Certain people are more susceptible to steroid-related eye pressure changes. If you have a family history of glaucoma, already have elevated eye pressure, or are using other steroid medications at the same time (inhalers, skin creams, eye drops), the cumulative steroid exposure could matter more. Close follow-up with eye exams is generally recommended for these higher-risk groups if they use intranasal steroids long-term, though current evidence suggests newer-generation nasal steroids carry less systemic absorption than older formulations.
If you don’t fall into any of those categories and you’re using an over-the-counter nasal spray like fluticasone for allergies, the odds of it affecting your eyes in any measurable way are very low.
When Floaters Deserve Attention
If you’re noticing new floaters, the timing with starting a nasal spray is most likely coincidental. Floaters are extremely common and usually harmless. However, certain patterns signal something more urgent: a sudden shower of new floaters, flashes of light in your peripheral vision, or a shadow or curtain effect creeping across your visual field. These can indicate a retinal tear or detachment, which needs prompt evaluation by an eye doctor regardless of what medications you’re taking.
A routine eye exam can check both your eye pressure and the health of your retina and vitreous, which would address concerns on both fronts: ruling out any steroid-related pressure changes and identifying the actual source of your floaters.