Why Do My Eye Drops Burn?

The surface is already irritated

The most common explanation is the least interesting one. If the surface of your eye is inflamed or your tear film is unstable, it is more sensitive than usual, and a drop landing on it registers more strongly than it would on a comfortable eye.

Burning and stinging are themselves symptoms of dry eye, which is why this gets circular. The drop is not creating the sensitivity. It is arriving on an eye that already had it, which is why a drop can sting on a bad day and feel like nothing on a good one.

That kind of sting settles within seconds. If it does, it is usually not the drop's fault.

Preservatives, and the four-times-a-day line

Here is the one worth acting on. Most multi-dose bottles contain a preservative to keep the contents sterile once opened. That is doing a necessary job, and for occasional use it is fine.

Frequency changes the maths. If you use artificial tears more than about four times a day, preservative-free drops are the gentler choice, because repeated exposure to preservatives can irritate the eye surface. Preservative-free options are preferred when drops are used frequently for exactly this reason.

So if your drops started stinging around the time your usage crept up, that is not a coincidence, and it is the single most likely thing to fix the problem.

Sensitive eyes are their own category

Some people react at lower frequencies than others. Preservative-free drops are often preferred for sensitive eyes, contact lens discomfort and screen-related dryness, not only for heavy users.

If your eyes react to a lot of things, treat preservative-free as the starting point rather than the upgrade you move to later.

The drop may be the wrong type

Not all lubricating drops are doing the same job. Thinner artificial tears are easy to use through the day. Thicker gels last longer but briefly blur vision. Ointments are for overnight. And drops aimed at evaporative dry eye, where the oil layer is the problem, are formulated differently again.

A drop that is wrong for your kind of dryness can feel unsatisfying or uncomfortable even when nothing is irritating you, which is a different problem from stinging and worth separating out. Our guide to choosing an eye drop starts from the symptom rather than the brand.

When it is not a lubricating drop at all

Worth checking the bottle. Redness-relief drops, allergy drops and medicated drops are different products with different formulations, and some sting considerably more than artificial tears do.

Redness drops in particular are easy to reach for by mistake. They make eyes look whiter without treating what is causing the redness, which makes them a reasonable choice before an event and a poor choice as a daily habit.

Technique makes a difference

A small thing that changes the experience more than people expect: where the drop lands. Aiming straight at the centre of an open eye guarantees the most sensitive part of the surface takes the full impact.

Pulling the lower lid down slightly and letting the drop fall into that pocket, then closing the eye gently for a moment rather than blinking hard, spreads it across the surface instead of dropping it onto one spot.

What a sting should not do

Some boundaries, because not all stinging is the ordinary kind.

A brief sting that fades in seconds is common. Pain that persists after the drop has settled, burning that gets worse with each dose, redness that increases, swelling, or vision that changes are not the ordinary kind, and none of them should be pushed through by finishing the bottle.

Stop using that product and speak to an eye doctor. That is true even if the bottle is new and expensive.

What to change first

Work in this order. If you use drops more than a few times a day, switch to preservative-free. If you already have, try a single-use vial format, which is the most sterile and the simplest possible formulation. If it still stings, the drop is probably not matched to your type of dry eye, and that is a conversation rather than another purchase.

Storing drops somewhere cool rather than in a hot car or a sunny window also helps more than people expect.

When to see an eye doctor

If drops are not enough, the cause may be meibomian gland dysfunction, inflammation or allergies, and each of those points somewhere different. Persistent stinging despite switching to preservative-free is a good reason to have the cause identified rather than to keep trying bottles.

See someone sooner if your symptoms are severe, painful, affecting one eye only, or affecting your vision. You can find a dry eye specialist near you through our network of more than 5,000 providers.