Patient guide
Dry eye: what it is, and what helps
By Dr. Sam Khoury, Optometrist13 min read
Some symptoms may feel like dry eye but may have different causes. Call the same day if any of these apply: pain rather than burning or grittiness, a change in your vision, new light sensitivity, a single eye affected rather than both, thick discharge, or any changes following an injury. If you wear contact lenses and one eye is red and sore, take the lens out and call now — some conditions can damage the cornea within a day. You can contact the office at (609) 246-0236. If the office is closed, or you cannot reach us, go to a hospital emergency room — most have an ophthalmologist on call.
Dry eye is uncomfortable but slow. Anything that arrives suddenly, hurts rather than irritates, or affects one eye alone is a different problem wearing the same clothes.
What dry eye is
Every time you blink, your lids spread a fresh film of tears across the front of the eye. That film keeps the surface smooth enough to see through clearly, keeps it comfortable, and rinses away dust. It is far thinner than a drop from a bottle, and it is built in three layers, each made by a different part of the eye.
- Oil, the thin outer layer, made by the glands along the edges of the lids. It slows evaporation, like a lid on a pot.
- Water, most of the film, made by the tear (lacrimal) gland above the outer corner of each eye. It keeps the surface moist and nourished.
- Mucin, the inner layer, made by cells on the surface of the eye. It helps the tears cling instead of beading off.
The tear film over the front of the eye, seen from the side. Illustration, not to scale.
Dry eye is what happens when that film stops doing its job. Either there is not enough of it, or it breaks apart too quickly between blinks. Patches of the surface dry out, the surface becomes irritated, and the eye lets you know.
How it feels
Burning, a gritty or sandy feeling, or the sense that something is in the eye. Redness. Eyes that feel tired by the end of the day, especially after reading or screen work. Vision that blurs and then clears for a moment when you blink. It is often worse in wind, in air conditioning or on a long drive, and it usually affects both eyes.
And, confusingly, watering. A dry surface can set off a flood of reflex tears that do not stay on the eye; the questions below explain why.
Who gets it
Anyone can, and it becomes more common with age. It is also more common in women, in people who spend long hours at screens or wear contact lenses, in dry or moving air, with some common medicines, and alongside autoimmune conditions.
For most people it is long-term: something to manage, like a skin or joint condition, rather than something one treatment clears up for good. The rest of this guide is about managing it well.
Two kinds of dry eye
Because the layers are made in different places, dry eye can start in different places.
Some eyes do not produce enough tears. The lacrimal gland underperforms, often with age, sometimes alongside an autoimmune condition or a medication. Adding artificial tears genuinely helps here, because the deficiency is the thing you are topping up.
Most eyes produce enough tears but cannot hold on to them. The oil glands along the lid margin — the meibomian glands — become blocked or their oil thickens. Without a working oil layer the tear film evaporates within seconds of a blink. This is the more common picture, and it is exactly why plain drops disappoint: you are adding water to a surface that has lost the ability to keep water on it.
Nearly everyone has some of both, in a mix that differs from person to person. The current international consensus is explicit that these categories are not mutually exclusive, and that most people need more than one thing addressed at once. Working out your particular mix is what an examination is for, and it is the reason the treatments are not interchangeable.
Why drops stop working
Almost everyone comes in having tried artificial tears. They help for twenty minutes, then nothing. That is not a sign that the drops were cheap. It is usually a sign that the drop was aimed at the wrong problem.
Why it keeps itself going
There is also a reason not to wait it out. An unstable tear film concentrates the salt in what tears remain, that saltiness irritates the surface, irritation drives inflammation, and inflammation makes the tear film less stable again. Left alone it feeds itself, which is why several of the prescription treatments are anti-inflammatory rather than lubricating.
What to do at home
This is worth working through properly before concluding that nothing helps. Most of it takes weeks rather than days, and the part people abandon first is usually the part that matters most.
Choosing a drop
Three to six times a day. Two things decide which bottle, and neither of them is price.
If the oil glands are the problem, use a drop with a lipid in it. These reinforce the oil layer rather than just adding water, and a plain tear is the wrong tool for an evaporation problem. Blink Triple Care PF combines a castor oil emulsion with hyaluronic acid and no preservative, which covers both jobs at once. Refresh Optive Mega-3 and Systane Complete PF are the other two worth knowing.
Look for hyaluronic acid on the label, sometimes written as sodium hyaluronate. It holds many times its own weight in water, so it keeps the drop on the eye far longer than a simple lubricant does. iVizia, Optase Hylo, Refresh Relieva and Systane Hydration all contain it.
If you are dosing more than four times a day, switch to preservative-free. Above that frequency the preservative starts irritating the surface you are trying to settle. This used to mean fiddly single-use vials; several brands now sell preservative-free in a multidose bottle with a valve that keeps it sterile, which is cheaper per drop and far less wasteful.
Otherwise any basic artificial tear is reasonable — Refresh Tears, Systane Ultra, TheraTears. Use drops through the day and a thicker gel at bedtime, when the eye goes hours without a blink.
If you wear contact lenses, read the label before you reach for a bottle. Rewetting drops, and any drop whose label says it can be used with contact lenses, can go in with the lenses in place. Most other drops tell you to take the lenses out and wait fifteen minutes — worth following, because a preservative trapped under a lens is not diluted by your tears the way it would be on a bare eye, and it accumulates in the lens material. If the label does not say it is for use with lenses, take them out.
Heat, then massage
This is the treatment that matches evaporative dry eye, and it is the one most people do incorrectly or give up on.
The heat has to be genuinely warm and it has to stay warm. The research points to around 40 to 45°C (104 to 113°F) held against the lids — a towel run under the hot tap is cool again inside two minutes and achieves very little. A microwavable mask such as the Bruder holds temperature for the full ten minutes, which is the point of owning one.
Then massage the lids. This is the step that gets missed. Heat softens hardened oil; it does not move it. After the compress, press along the lid margin with a fingertip, rolling from the base of the lashes outward, on both upper and lower lids. Without that, you have warmed the blockage and left it where it was.
Once or twice a day. Then clean the lid margins — and which cleanser depends on what is actually wrong with them, because the common ones are not interchangeable.
A crusty, red, colonized lid margin points toward a hypochlorous acid spray. It is a mild antiseptic that lowers the bacterial load, it needs no rinsing or rubbing, and it stings far less than the alternatives. Avenova, Ocusoft HypoChlor and Optase Protect are the usual ones.
Fine, waxy sleeves around the base of the lashes point to Demodex mites, which need a different cleanser and sometimes a prescription. More on eyelash mites.
For general cleaning without either problem, a plain foam or wipe such as Ocusoft is fine.
Give this six weeks before deciding whether it works.
Screens, air and blinking
Blink rate falls by more than half while reading a screen, and many of the blinks that do happen are partial ones that never fully close — which means the oil layer never gets spread. Every twenty minutes, look at something twenty feet away for twenty seconds and make several deliberate, complete blinks while you do.
Keep moving air off your face: car vents, desk fans, ceiling fans overnight. A humidifier helps through the winter. Smoke makes everything worse.
These sound trivial next to drops and prescriptions. They are not — environmental and behavioral changes are treated as a genuine part of long-term management, not as filler advice.
Omega-3, and what the evidence actually says
Worth trying, with realistic expectations, and you should know the evidence is genuinely mixed rather than settled.
The largest single trial gave 535 patients 2,000 mg of EPA and 1,000 mg of DHA a day for a year and found no difference from placebo. That result is real and it deserves to be said. But the placebo was olive oil, which may not be inert, and a later analysis pooling nineteen trials and more than four thousand patients did find benefit — with better results from higher doses, longer use, and formulations weighted toward EPA rather than DHA.
The current international guidance still includes omega-3 as part of dry eye management. So: 1,000 to 2,000 mg a day of combined EPA and DHA, favoring higher EPA, and give it three months. PRN De3 is the one usually chosen where EPA weighting matters; TheraTears Nutrition and Nordic Naturals are reasonable alternatives. It works by changing the quality of oil the glands make, which is not a fast process.
Check with your cardiologist first if you have a heart condition or take a blood thinner.
What an examination adds
The value of the visit is not a longer conversation about drops. It is measurement. Looking at the lid margins and the gland openings under magnification, timing how fast the tear film breaks up after a blink, staining the surface to see where it is actually damaged and, if the glands have been failing for a while, whether they have begun to shrink.
That is what tells you which mix you have, and therefore which of the following is worth doing.
Prescription drops, matched to the mechanism
If tear production is the problem, the drugs that work on the underlying inflammation are cyclosporine — Restasis, or the newer Cequa and Vevye, which many patients tolerate with noticeably less stinging — and lifitegrast, sold as Xiidra. All of them work over weeks to months rather than days.
If evaporation is the problem, there is now a drop aimed directly at it. Miebo spreads a thin layer across the surface of the tear film to slow evaporation, rather than adding more water to a film that cannot hold it. It was the first prescription drop designed to target evaporation directly. Its approval covers dry eye in general, and the trials behind it enrolled people whose dry eye came from the oil glands.
If mites at the lash base are driving it, Xdemvy treats them directly: a six-week course, then finished. How it works and what to expect.
A short course of a steroid is sometimes used first, to interrupt the inflammatory cycle and give the slower treatments room to work. Which of these fits, or whether any does, depends on what the examination finds — and a steroid in the wrong eye makes things considerably worse, which is why these are prescription and why borrowing someone else's drops or ordering them online is a bad idea.
Punctal plugs. Small plugs placed in the tear drainage openings so the tears you do produce stay on the eye longer instead of draining away. Placed in the office, and removable.
Common questions
Why do my eyes water if they are dry?
It sounds contradictory and it is very common. A dry, irritated surface triggers a reflex flood of watery tears that lack the oil to stay put, so they run down your face instead of coating the eye. Watering is often a dry eye symptom rather than the opposite of one.
Does omega-3 actually work?
The honest answer is that it helps some people and the evidence is mixed. The biggest trial found no benefit over placebo; a larger pooled analysis of nineteen trials did find one, especially at higher doses with more EPA and longer use. Current guidance keeps it as a first-line option, particularly for oil gland problems. It is inexpensive and low-risk for most people, which is why it stays on the list — but it is not the thing that rescues a case on its own.
Are the expensive drops better than the cheap ones?
Not reliably. What matters is whether the drop matches your problem — a lipid-containing drop if the oil glands are failing, preservative-free if you are dosing frequently or wearing lenses. A well-matched inexpensive drop beats an expensive one aimed at the wrong mechanism.
Can dry eye damage my eyes, or is it just uncomfortable?
Long-standing untreated dry eye can damage the corneal surface, and meibomian glands that stay blocked for long enough can waste away in a way that does not come back. That is the argument for treating it properly rather than tolerating it. It also degrades vision quality — blur that clears briefly when you blink is a common sign.
Can my medications be causing this?
Often. Antihistamines, antidepressants, diuretics, beta blockers, isotretinoin and hormonal treatment all reduce tear production or change tear quality. Bring your list. Sometimes the useful change is a dose, a timing, or an alternative — discussed with the doctor who prescribed it, not stopped on your own.
Does dry eye go through my vision plan or my medical insurance?
If dry eye is the reason for your visit, it is a medical visit and goes through your medical insurance, even though you are seeing an optometrist. Vision plans cover routine eye exams and eyewear; medical plans cover conditions, and dry eye is a condition.
Many patients carry both and are not sure which applies. Call with your plan details before you book and it can be sorted out beforehand rather than afterwards.
Book an evaluation
If you have worked through the home care and it has not helped, the next step is finding out which type you have. That is a specific examination, not a longer conversation about which drop to buy.
Khoury Eye Care, Hamilton Mall, 4403 Black Horse Pike, Mays Landing.