Visine burns because its ingredients irritate the surface of your eye, especially if that surface is already dry or inflamed. The sting you feel is a real chemical reaction, not just a sign the drops are “working.” Understanding why it happens can help you decide whether to keep using these drops or switch to something gentler.
The Preservative Is the Biggest Culprit
Most Visine formulas contain a preservative called benzalkonium chloride, or BAK. This chemical is used in roughly 70% of all eye drop formulas to prevent bacterial contamination, but it comes with a well-documented downside: it damages the cells on the surface of your eye. BAK is toxic to corneal and conjunctival epithelial cells, the delicate layer that lines your eye and keeps it comfortable. Even brief exposure triggers the production of hydrogen peroxide inside those cells, causing oxidative stress and disrupting the energy-producing structures (mitochondria) by more than 90% in some lab studies.
The concentration matters here. Researchers have estimated that BAK becomes toxic to eye tissue at concentrations as low as 0.005%, yet it’s commonly used in eye drops at concentrations of 0.02% to 0.04%, well above that threshold. The clinical result is exactly what you’re feeling: stinging, burning, foreign body sensation, itching, and dryness. A large study of over 9,600 patients found that people using eye drops with BAK preservatives reported burning and stinging two and a half times more often than those using preservative-free formulations. Foreign body sensation was three times more common.
The Active Ingredient Plays a Role Too
Visine’s redness-relieving formula contains 0.05% tetrahydrozoline, a vasoconstrictor that works by squeezing the tiny blood vessels on the surface of your eye. This reduces redness temporarily, but it also reduces blood flow to the tissue, which means less oxygen and fewer nutrients reaching those surface cells. Over time, this creates a cycle: the blood vessels try to compensate by dilating more aggressively once the drop wears off, making your eyes redder than they were before you used the drops.
This rebound redness, called conjunctivitis medicamentosa, can develop after as few as 5 to 10 days of repeated daily use. Once it sets in, you may find yourself reaching for the drops more frequently, which exposes your eyes to more BAK and more vasoconstriction with each application. The burning often gets worse as this cycle progresses because the eye surface becomes increasingly irritated and inflamed.
Dry Eyes Make the Burning Worse
If you already have dry eyes, even mildly, Visine is likely to burn more intensely. A healthy tear film acts as a buffer, diluting the preservative and active ingredient before they fully contact your cornea. When your tear film is thin or unstable, those chemicals hit the eye surface at higher concentrations. Topical eye medications, including their preservatives, can also interfere with the glands that produce the oily and mucous layers of your tear film. This means the drops can actually worsen the dryness that made your eyes uncomfortable in the first place, creating a feedback loop of irritation.
Inflammation is central to this process. BAK-preserved drops can trigger inflammation on the eye surface, and inflammation is one of the primary drivers of dry eye disease. So while you may have picked up the drops to relieve irritation, the drops themselves can push your eyes further into a dry, inflamed state where every subsequent application stings more.
When the Burning Signals a Real Problem
A brief, mild sting when you first put in a drop is common and typically fades within a few seconds. But burning that lasts longer than a minute, gets worse with each use, or is accompanied by increased redness, blurred vision, or discharge is a sign that something beyond normal irritation is going on. The product label advises stopping use if redness or irritation lasts beyond 72 hours or if the condition worsens.
Allergic reactions to BAK or other inactive ingredients are also possible. These tend to produce itching and swelling in addition to burning, and they get worse rather than better with continued use. If your eyelids become puffy or the skin around your eyes turns red and scaly, that pattern suggests a contact allergy rather than simple chemical irritation.
Alternatives That Won’t Burn
The American Academy of Ophthalmology recommends trying preservative-free lubricating drops (artificial tears) before reaching for any redness reliever. These drops come in single-use vials with no BAK, so they skip the most irritating ingredient entirely. If simple lubrication clears the redness, which it often does when dryness is the underlying cause, you avoid the vasoconstriction cycle altogether.
If you specifically need redness relief, a newer active ingredient called brimonidine works through a different mechanism than tetrahydrozoline and carries a lower risk of rebound redness. It’s available over the counter in several formulations. Some versions are also preservative-free, which addresses both the burning and the rebound problem at once.
For everyday eye comfort, preservative-free artificial tears can be used as often as needed without the risks that come with vasoconstrictor drops. The label on Visine limits use to four times daily, and the product is designed for short-term, occasional use, not as a daily habit.