Hylo vs Thealoz Duo: Which Dry Eye Drops Are Right for You?
If you've stood in front of a pharmacy shelf full of preservative-free eye drops, you've probably wondered what actually separates all the different bottles. Two of the most popular ranges — Hylo and Thealoz Duo — both do an excellent job of relieving dry eye, but they take slightly different approaches. Understanding that difference can help you pick the right drop the first time, instead of working through the whole shelf by trial and error.
The Short Answer
Hylo drops are built around hyaluronic acid (sodium hyaluronate), sometimes combined with an extra ingredient like ectoine or dexpanthenol. They work primarily by hydrating and cushioning the eye’s surface, and the range is graded from mild to intensive.
Thealoz Duo drops combine trehalose with hyaluronic acid. Trehalose adds a protective, cell-supporting element on top of the hydration, which is why Thealoz is often positioned for surface stress, healing, and reducing how often you need to reapply.
Neither is “better” outright — they’re built on different science, aimed at slightly different needs. Here’s the detail.
What’s Actually in Each Range?
Hyaluronic acid: the shared ingredient
Both ranges use hyaluronic acid as a base. It’s a naturally occurring substance that holds onto water and coats the eye’s surface, providing lubrication and comfort. Where the two ranges diverge is what’s added to it — or how concentrated it is.
The Hylo range — mildest to strongest
- Hylo-Fresh — 0.03% hyaluronic acid plus eyebright (euphrasia) extract, for minor, occasional dryness and quick refreshment
- Hylo-Tear — 0.1% sodium hyaluronate, for standard everyday relief
- Hylo-Care — 0.1% hyaluronic acid plus dexpanthenol, for daily eye strain and surface support
- Hylo-Forte — 0.2% sodium hyaluronate (double the strength of Hylo-Tear), for severe or chronic dry eye and post-surgery care
- Hylo-Dual — 0.05% hyaluronic acid plus 2% ectoine, aimed at dry eye and irritation linked to allergies
- Hylo-Dual Intense — 0.2% hyaluronic acid plus 2% ectoine, for chronic, severe dry eye with inflammatory symptoms like itching and burning
The logic of the Hylo range is essentially a ladder: as your symptoms get more severe or persistent, you move up to a thicker, more concentrated formula.
The Thealoz range
- Thealoz Duo — 3% trehalose plus 0.15% hyaluronic acid, for moderate to severe dry eye. Trehalose is a natural substance found in plants and organisms that survive extreme dryness; combined with hyaluronic acid it provides hydration, bioprotection, and supports regeneration of the eye’s surface.
- Thealoz Duo Gel — a thicker version of the same combination, formulated for night-time use. Designed to stay in contact with the eye for extended periods without causing significant blurring.
Hylo vs Thealoz Duo: Side-by-Side
| Hylo | Thealoz Duo | |
|---|---|---|
| Core ingredient(s) | Hyaluronic acid (± ectoine, dexpanthenol or eyebright depending on variant) | Trehalose + hyaluronic acid |
| How it works | Hydration and cushioning — viscosity does most of the work | Hydration plus cell protection and surface support from trehalose |
| Best suited to | Those wanting a thicker, longer-lasting cushion; Hylo-Forte or Hylo-Dual Intense for severe/chronic cases | Those reapplying thin drops frequently; the combination tends to hold comfort longer |
| Contact lens use | Most variants are lens-compatible; Hylo-Dual Intense generally is not | Preservative and phosphate-free; can be used with contact lenses |
| Delivery system | COMOD® preservative-free multidose pump | ABAK® preservative-free multidose pump |
| Night-time option | Hylo-Night | Thealoz Duo Gel |
Which Should You Choose?
Choose Hylo if:
- Your main issue is a lack of lubrication or moisture
- You want a range that scales up as your symptoms get worse, from Hylo-Fresh through to Hylo-Dual Intense
- Your dry eye is linked to allergies (Hylo-Dual) or you need intensive, chronic relief (Hylo-Dual Intense)
Choose Thealoz Duo if:
- You’re already using a basic lubricating drop several times a day and it’s not lasting
- You want a formula that supports the health of the eye’s surface, not just moisture — useful after eye surgery or during periods of surface stress
- You want the option to step up to Thealoz Total if itching or redness is part of the picture
Why Thealoz Duo lasts longer
One of the most frequent complaints from dry eye sufferers is having to apply drops every hour. Clinical data shows that a single drop of Thealoz Duo can provide comfort for up to 4 hours — compared to many standard high-concentration drops which may only stay active for around 40 minutes.
300 drops per bottle — up to 50 days of treatment
Thealoz Duo uses the ABAK® bottle system, which keeps the solution 100% preservative-free and delivers a consistent drop size every time. Each 10ml bottle provides 300 drops — more than many similar-looking bottles that offer only 225 — giving up to 50 days of treatment per bottle, making it one of the most cost-effective premium drops available.
Both ranges are:
- Preservative-free and phosphate-free — suitable for frequent, long-term use and sensitive eyes
- Safe to use alongside most other dry eye treatments, such as warm compresses or omega-3 supplements
- Available in day and night formulations
Still Not Sure Which One Is Right for You?
Because Hylo and Thealoz Duo work slightly differently, the right choice often comes down to what’s causing your dry eye in the first place — not just how severe it feels. If you’re regularly reapplying drops without lasting relief, or you’re not sure whether your symptoms come from a lack of water, evaporation, or inflammation, it’s worth having your eyes assessed by an optometrist or pharmacist rather than guessing between bottles.
Shop the full range of Hylo and Thealoz Duo eye drops, including night-time gels and intensive formulas.
This article is for general information only and is not a substitute for personalised advice from your optometrist, pharmacist or GP. We are always happy to answer any questions you may have if you phone us on 066 7131111.