Most people who come to us saying "my eyes are dry" have eyes that are producing plenty of tears. The problem isn't the volume of tears. It's that the tears are evaporating off the surface of the eye within seconds of a blink.
That's meibomian gland dysfunction, and it's behind the majority of dry eye we see.
What the meibomian glands actually do
There are roughly 25–40 glands running vertically through your upper eyelid and about 20–30 in the lower, opening in a neat row just behind your lashes. Every time you blink, they squeeze a small amount of oil — meibum — onto the surface of the tear film.
That oil layer is what stops your tears evaporating. Without it, a healthy tear film that should last ten seconds between blinks breaks up in three or four.
When the glands get blocked, or the oil in them thickens from a clear liquid to something closer to toothpaste, you get evaporative dry eye. Left long enough, the glands themselves can shorten and drop out — and that part is not reversible, which is the honest reason to deal with it early rather than waiting.
How to tell MGD from ordinary dry eye
A few patterns point towards the glands rather than tear volume:
Your eyes water. This sounds backwards, but it's the most common presentation. A dry, irritated surface triggers reflex tearing — a flood of watery tears with no oil in them, which evaporate just as fast. Watering eyes and dry eyes are frequently the same condition.
It's worse in the evening, and worse on screens. Blink rate drops by more than half when you concentrate, so the glands get expressed less often.
Your lid margins look slightly red or thickened, and the row of gland openings behind your lashes may look capped or crusted.
Drops help for twenty minutes, then stop. If you're instilling a lubricant several times a day and getting only brief relief, you're topping up a tear film that has no lid to keep it in.
You get recurrent styes or lumps. A blocked gland that becomes inflamed is a chalazion — a firm, painless lump in the lid, distinct from a stye at the lash line.
What actually helps
MGD is managed, not cured. The glands don't get permanently unblocked and stay that way; this is a routine you keep, like flossing. Anyone selling you a one-off fix is overselling it.
1. Heat, properly
This is the part almost everyone does wrong. Normal meibum melts across roughly 19–45°C — healthy oil at the lower end, while in MGD the thickened meibum sits at the higher end, often above normal body temperature (37°C), which is why body heat alone never clears a blocked gland. The target is an eyelid temperature of at least 40°C, and a facecloth run under the hot tap holds the lid above 40°C for only about the first minute and drops below target within two minutes — you would have to reheat it every two minutes to keep it there.
You need sustained heat, held against closed lids for at least 10 minutes, once daily. That is what the current evidence review in Ophthalmology and Therapy (2024) settles on: 40°C is the identified temperature of therapeutic efficacy, and once daily is the recommendation specifically because adherence drops as the frequency rises. Done properly alongside lid hygiene and lubricants, most people notice a difference within two to three weeks — and if you've done it consistently for three weeks with no change, that's worth acting on rather than pushing through. A proper compress does this far more reliably than a cloth:
- Bruder Moist Heat Eye Compress — reusable, microwaves in seconds, holds heat for the full session. The one we use in practice.
- iFlo USB Heated Eye Mask — holds a set temperature from the mains, so nothing cools mid-session. Best for daily long-term use.
- Opti-Soothe Moist Heat Mask or the Eye Heat Wheat Bag — lower-cost reusable options.
- Lula Self-Warming Eye Masks — single-use and air-activated, for travel and the office.
Follow the heat immediately with a gentle massage — roll a clean fingertip from the base of the lid towards the lash line, upper lid downwards and lower lid upwards. Heat without expression softens the oil and leaves it exactly where it was.
2. Lid hygiene
Warm the glands, then clean the margin. A dedicated lid cleanser or a hypochlorous acid spray keeps the bacterial load and debris at the gland openings down. Ordinary facial cleansers and baby shampoo are not designed to go near the ocular surface and tend to strip the very oils you're trying to preserve.
Our full range sits in Lid Hygiene & Blepharitis.
3. A drop that replaces oil, not just water
This is where the choice of drop matters, and where most people default to the wrong bottle:
- Systane BALANCE is formulated specifically for dry eye associated with MGD — it carries a lipid component intended to supplement a deficient oil layer, rather than simply adding water. If your dryness is gland-driven, start here rather than with a standard lubricant.
- NovaTears is a water-free, preservative-free drop that spreads as an ultra-thin layer across the tear film. It's designed for evaporative dry eye, and a single drop goes a long way — most people over-instil it at first and find it blurs briefly.
- Optimel Manuka Honey Forte Eye Gel is an option where lid margin inflammation is part of the picture. Fair warning, and this is the mechanism rather than a fault: it stings. People who aren't told this in advance stop after two days.
- Systane GEL is thicker and better suited to overnight use, when evaporation is at its worst and blur doesn't matter.
The broader range is in Dry Eye Drops NZ and Systane Eye Drops NZ. If you'd rather not assemble it yourself, the Complete Dry Eye Kit puts the heat, lid and drop steps together in one order.
4. Omega-3, with realistic expectations
There is reasonable evidence that omega-3 supplementation can influence meibum quality, and equally there are trials that found no meaningful benefit over placebo. If you try it — Lacritec is the formulation we stock — give it three months, and treat it as an adjunct to heat and hygiene rather than a replacement for them.
When to stop self-managing and get the lids examined
Book an appointment rather than buying another bottle if you have: pain rather than irritation, light sensitivity, any drop in vision, a lump in the lid that hasn't settled in a fortnight, or lid margins that are still red and crusted after two to three weeks of consistent heat and hygiene.
There's also a limit to what any product can tell you about yourself. We can look at the gland openings under magnification, express a gland to see what comes out, measure how fast your tear film breaks up, and image the glands to see how many are still structurally intact. That last one changes the conversation — if the glands are healthy but blocked, the outlook with treatment is good; if there's significant dropout, the goal shifts to protecting what's left.
If you're still uncomfortable after several doses a day, the drop isn't the problem — the diagnosis is.
→ Book a Dry Eye Evaluation · paid, in-depth assessment · fee confirmed when you book — we'll work out what's actually driving it and what your options are.
The full pathway, start to finish, is in our dry eye guide.
Rose Optometry has been looking after eyes in Hamilton since 1969. Everything above is in stock and dispatched from our practice, with free NZ shipping on orders over $100.
Written by Jagrut Lallu — BOptom (Hons), MSc Specialty Lenses (Hons), FIAOMC. Therapeutic Optometrist & Contact Lens Specialist. Founder, New Zealand Eye Research Centre; Partner, Rose Optometry; WCO Asia-Pacific Myopia Ambassador; International Myopia Institute NZ Ambassador; Clinical Senior Lecturer, Deakin School of Optometry; Honorary Teaching Fellow, University of Auckland.
General information, not a diagnosis — if your eyes are painful or your vision has changed, book an examination.
Related: Blepharitis: how to actually treat it · Which dry eye drop suits which eye