Artificial Tears: Choosing Preservative-Free Drops and Gels

The quick answer: for everyday dryness, start with a thin lubricating drop; move to a gel if the relief doesn’t last; save ointment for night-time. If you use drops more than about four times a day, or you wear contact lenses, choose preservative-free. And dryness with pain or changes in vision is a job for a doctor, not a new bottle.

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Walk into a pharmacy and ask for “something for dry eyes” and you may well be shown five small boxes that all look alike, with different prices, different colours and almost identical promises printed across the front. Most of them are artificial tears, lubricating drops that top up the thin film of moisture over your eye. Gentle stuff. Still, choosing the right type and the right bottle makes a real difference to how well they work and how your eye feels after weeks of regular use, especially if you’re reaching for them many times a day at a screen.

What artificial tears actually do

Your natural tears are not just water. They come in three layers, an oily top that slows evaporation, a watery middle, and a sticky base that helps the film cling to the eye, and when any layer runs short the surface dries between blinks and feels gritty or burning. Artificial tears add a smooth, slippery layer that fills the gaps for a while. They don’t change how many tears your glands make. Moisturiser, basically.

Common ingredients on the label include carboxymethylcellulose, hypromellose, sodium hyaluronate (hyaluronic acid), carbomer, polyvinyl alcohol, glycerin and, in some, light oils or lipids for people whose tears evaporate too fast.

Drops vs gels vs ointment

Many people end up with two. A light drop for the day, something thicker at bedtime. If you wake with sore eyes, or a family member notices your eyes don’t fully close when you sleep, an ointment before bed often helps. Just don’t drive straight after. Or read.

Why preservative-free matters

Bottles that are opened again and again need something to stop germs growing inside. The commonest preservative is benzalkonium chloride (BAK), and while it does that job well, on the surface of the eye it can be irritating, building up the more often you use it. Once or twice a day? Usually fine. All day? It can make the dryness worse.

Preservative-free options come two ways:

• Single-use vials: small plastic tubes you twist open, use, and throw away. Check the label; some can be recapped for the same day, others are one use only.
• Special multi-use bottles: with a one-way valve or filter that keeps germs out without a preservative. They cost more at first but often work out cheaper than vials.

Some bottles use “vanishing” preservatives that break down into harmless substances once they touch the eye, which makes them gentler than BAK, though still not quite the same as a truly preservative-free drop.

How often is reasonable?

Lubricating drops have no strict upper limit the way medicines do. A reasonable guide: preserved drops up to about four times a day, preservative-free as often as you need. But if you’re reaching for the bottle every hour and still uncomfortable, something is driving the dryness that drops alone won’t fix, such as blocked oil glands in the lids, a medicine side effect, or a condition like thyroid eye disease or Sjögren’s. That’s worth a proper check.

Artificial tears and contact lenses

Not every drop is safe with lenses in. Look for “suitable for contact lenses” on the box, and prefer preservative-free, because soft lenses can soak up preservatives and hold them against the eye. Gels and ointments aren’t used with lenses in. Your eye care routine for lenses matters as much as the drop, and our contact lens care routine covers wear hours and cleaning.

How to choose at the pharmacy

1. Decide when you need it: daytime only, night, or both.
2. Count how often: more than about four times a day means preservative-free.
3. Check for lenses: if you wear them, look for lens-compatible.
4. Read the ingredient, not the promise. A lubricating drop should list only lubricants. Avoid “redness relief” or “whitening” on the box; that’s a decongestant, not a tear.
5. Try one for 2 to 3 weeks before deciding it doesn’t suit you, unless it stings or causes redness, in which case stop and ask a pharmacist.
6. Note the discard time after opening and write the date on the box.

Help drops work better

Artificial tears do more when the room helps. Point the fan or AC away from your face. Blink fully during screen work, and look away every 20 minutes at something across the room or out of the window, which lets the focusing muscle rest and reminds you to blink. A warm compress on closed lids for about 5 to 10 minutes can loosen thick oils in the lid glands. Drink enough water through the day. For a week-long plan built around these habits, try our 7-day screen eye reset, and for the home checks that separate simple dryness from something more, see dry gritty eyes and the red flags. Other guides sit in our Eye Care section.

Artificial tears: common questions