Contact Lenses and Dry Eye

Normally, the tear film spreads directly across the ocular surface. A contact lens changes that arrangement. Once a lens is placed on the eye, the tear film is divided into two compartments:

• •the pre-lens tear film: in front of the contact lens
• •the post-lens tear film: between the contact lens and the cornea

That may sound like a small change. Physically, it is not. The lens creates an entirely new surface over which tears must spread and remain stable. Research has shown that contact-lens wear can alter the biophysical and biochemical properties of the tear film.

The Tear Film: how a healthy one works

It can. The pre-lens tear film is generally less stable than the normal tear film over the cornea. During contact-lens wear, researchers have observed changes including:

• •faster tear-film breakup
• •increased tear evaporation
• •changes in tear volume and flow
• •changes in the lipid layer
• •changes involving tear mucins and proteins

These changes can help explain why lenses may feel perfectly comfortable when first inserted but become increasingly noticeable later in the day. The system has to maintain a stable tear layer over an artificial surface for hours.

Contact lens discomfort frequently increases with wearing time. As the day progresses, the tear film over the lens may become less stable, the lens surface can change, and deposits can accumulate. Environmental conditions also matter. Long periods of screen use, reduced blinking, low humidity, air conditioning or heating can add additional evaporative stress.

So the lens may not be the only factor. A more realistic picture may be:

contact lens + unstable tear film + reduced blinking + dry environment→increasing discomfort

This is one reason why someone can wear the same lenses comfortably on one day and struggle with them on another.

Environment, Humidity, Wind and Dry Eye

No. TFOS defines contact lens discomfort as adverse ocular sensations associated with lens wear, with or without visual disturbance, resulting from reduced compatibility between the lens and the ocular environment and potentially leading to reduced wearing time or discontinuation. That overlaps enormously with dry-eye symptoms. But the two diagnoses are not interchangeable.

Someone may feel dry and uncomfortable only while wearing lenses and feel completely normal without them. Another person may already have dry-eye disease and simply notice that lenses make it worse. And another may develop symptoms during lens wear and later continue experiencing symptoms even without lenses. Those are not necessarily the same clinical situation.

Yes. Contact-lens wear is recognized as a potential contributor to dry eye, and TFOS has historically classified contact lenses among iatrogenic factors associated with DED. But this does not mean that contact lenses inevitably cause dry eye. Many people wear them for decades without developing clinically significant DED.

The more useful question is: does contact-lens wear push this particular ocular surface beyond what it can comfortably compensate for? That may depend on the tear film, meibomian glands, blinking, lens material and fit, wearing time, environment and other individual factors.

They can. Contact-lens wear changes the lipid layer and the physical properties of the tear film, and increased evaporation during lens wear has been associated with poorer comfort. This does not mean that every lens produces exactly the same amount of evaporation. Lens material, surface characteristics, water content, fit and environmental conditions can all influence what happens.

But it explains why simply having “enough tears” does not guarantee comfortable contact-lens wear. Those tears also have to remain stable over the lens surface.

The lipid layer normally sits at the air–tear interface and helps regulate evaporation and tear-film behaviour. When a contact lens is inserted, that normal tear-film architecture changes. TFOS reports alterations in the tear lipid layer during contact-lens wear, and impaired lipid-layer characteristics have been associated with worsening comfort. This becomes especially relevant when someone already has abnormal meibomian gland function.

The ocular surface may have less reserve to tolerate the additional tear-film disturbance created by the lens.

Meibomian Glands & Lipids

Yes. Blinking and contact lenses interact in both directions. The eyelid has to move across the lens surface with every blink. Lens discomfort can alter blink behaviour, while incomplete or reduced blinking can make the tear film over the lens less stable. Altered blinking patterns are among the clinical findings described in contact-lens discomfort.

This becomes particularly relevant during screen use. When someone is concentrating on a computer or phone, blink rate and blink completeness can change. Add a contact lens to an already stressed tear-film system, and symptoms may become much more noticeable. We will look at Screens, Reduced Blinking & Dry Eye separately in the next article.

Screens, Reduced Blinking & Dry Eye

Why Blinking Matters

This is where the answer becomes much less certain. There is evidence of an association between contact-lens wear and meibomian-gland abnormalities. Some studies have found greater gland loss, altered meibum quality or poorer gland function among contact-lens wearers.

One frequently cited study found greater meibomian gland loss in contact-lens wearers and an association between the amount of gland loss and duration of lens wear. More recent studies have also reported greater meibomian gland loss among contact-lens wearers compared with controls. But that is not the end of the story.

No. A review specifically examining contact lenses and MGD found conflicting evidence. Of 22 studies included in the review, 15 reported an effect on meibomian gland morphology or function, while 7 did not find a significant effect. The authors concluded that better prospective long-term studies are needed to clarify the relationship.

That distinction matters. An association between longer contact-lens wear and more gland abnormalities does not automatically prove that contact lenses caused those abnormalities. There may be differences between lens wearers and non-wearers that are difficult to completely control. Different lens materials, wearing schedules and care systems may also matter. So the evidence is concerning enough to take seriously, but not strong enough to tell every long-term lens wearer:

“Your contact lenses damaged your meibomian glands.”

Meibomian Gland Dysfunction (MGD) — coming soon

Several mechanisms have been proposed. The interaction between the eyelid and lens during blinking may create mechanical changes at the lid margin. Altered blinking may influence normal meibum delivery. Changes in the tear film and ocular-surface environment could potentially affect gland function.

But these mechanisms remain incompletely established. This is an area where we should distinguish clearly between a biologically plausible mechanism and a mechanism proven to explain long-term gland changes in humans. We do not yet have all of those answers.

Yes. Contact lenses are not one uniform product. They differ in:

• •material
• •water content
• •surface properties
• •oxygen permeability
• •design
• •fit
• •replacement schedule
• •care system

TFOS identifies lens material, design, fit, replacement frequency and lens-care products among the factors that can influence contact-lens-related discomfort and dry eye. This is why switching lenses can sometimes make a substantial difference even though the person is still technically “wearing contact lenses.”

They can be useful for some people, particularly because a fresh lens is used each day and no reusable-lens care system is required. But a daily disposable is not a guaranteed comfortable lens, and it is not a dry-eye treatment. Comfort depends on the interaction between a particular lens and a particular ocular surface. Someone with significant MGD or unstable tears can still struggle with an excellent daily disposable lens. The lens cannot completely compensate for an unhealthy tear-film system.

Yes. For reusable lenses, the care system is another variable. Solutions contain different disinfecting agents, preservatives and other ingredients, and lens-solution interactions can affect comfort in some wearers. This is why changing or eliminating a lens-care system is among the strategies TFOS has discussed for contact-lens-related discomfort.

Again, this does not mean that contact-lens solutions are inherently harmful. It means they are one more component of the system.

Contact-lens wear has been associated with changes in corneal sensation in some research, but the relationship is not straightforward. TFOS notes that contact-lens wearers can show varying degrees of reduced corneal sensation. However, not every study finds meaningful neurosensory abnormalities. For example, a 2023 study comparing silicone-hydrogel lens wearers with non-wearers found similar sub-basal nerve density and corneal sensitivity between groups, despite more symptoms and worse meibography findings in lens wearers.

So we should not assume that long-term contact lenses mean corneal nerve damage. The neural effects appear considerably more complex.

Corneal Nerves

Absolutely. This is a common pattern. Someone may say:

“I wore contact lenses for 10 or 20 years without any problem. Why can’t I wear them now?”

There may not be one answer. The lens may be the same. But the ocular surface is not necessarily the same. Over time, changes may occur in:

• •meibomian gland function
• •tear production
• •hormones
• •blinking behaviour
• •screen exposure
• •medications
• •environment
• •or other parts of the ocular-surface system

Contact lenses may therefore become less tolerable even though they were not the single cause of everything that changed.

Age, Hormones and Dry Eye

We do not have a simple answer. Contact lenses clearly change the tear film while they are being worn. What is much less clear is whether all of those changes persist after lenses are discontinued. TFOS has specifically highlighted this uncertainty: changes to the tear lipid layer and mucins occur during lens wear, but whether such changes are transient or more permanent has not been adequately established.

That is an important gap in the evidence. It means we should be careful with claims such as:

“Twenty years of contact lenses permanently destroyed my tear film.”

Current evidence cannot establish that conclusion simply from the history of long-term lens wear.

Sometimes symptoms improve considerably. If the contact lens itself is the dominant source of tear-film disturbance and discomfort, removing it removes that stressor. But if dry-eye disease is already present independently, stopping lenses may not make it disappear. For example, someone may have:

• •MGD
• •aqueous deficiency
• •ocular-surface inflammation
• •incomplete blinking
• •or another driver that remains after the lenses are gone

This distinction is extremely important: contact lenses can be a contributor without being the entire disease.

Possibly. And this remains an important unanswered question. TFOS has explicitly raised the possibility that some people who become symptomatic during contact-lens wear may already have been predisposed to dry eye, with the lens effectively pushing the system beyond its compensatory capacity. In other words, two different stories may sometimes look identical:

contact lenses→ocular-surface changes→dry eye

vulnerable ocular surface + contact lenses→symptoms become apparent

And in reality, both processes may occur together.

Not necessarily. Some people with mild or well-controlled dry eye can continue wearing lenses comfortably with appropriate lens selection and management of the underlying ocular-surface problem. TFOS distinguishes between contact-lens-induced dry eye and people who already have DED and want to wear contact lenses. The appropriate approach depends on what is actually wrong.

If the problem is MGD, treating the glands may improve tolerance. If the lens fit or material is contributing, changing the lens may help. If the problem is reduced blinking during prolonged computer work, addressing the lens alone may not be enough. And if the ocular surface is significantly compromised, a temporary or longer break from lenses may sometimes be appropriate.

Interestingly, yes. This sounds contradictory, but it illustrates why “contact lenses are bad for dry eye” is too simplistic. Specialized therapeutic lenses, particularly scleral lenses, can be used in selected patients with significant ocular-surface disease. Rather than functioning simply as ordinary vision-correction lenses, scleral lenses can create a fluid reservoir over the cornea and protect the ocular surface.

Soft bandage lenses can also be used therapeutically in particular circumstances. These applications are very different from ordinary cosmetic or refractive contact-lens wear and require professional management because contact-lens use also carries risks, including microbial keratitis.

Scleral Lenses and Dry Eye

Instead of simply asking “Do contact lenses make my eyes dry?” it is more useful to examine the whole system. For example:

• •What happens to tear-film stability?
• •Are the meibomian glands functioning normally?
• •Are the blinks complete?
• •Is there ocular-surface staining?
• •Do symptoms disappear when the lenses are removed?
• •Does the lens fit appropriately?
• •Does changing lens material or replacement schedule change the symptoms?
• •Are environmental or screen-related factors contributing?

And: was dry-eye disease already present before contact-lens intolerance developed? These questions tell us much more than the simple fact that someone wears lenses.

How Dry Eye Is Diagnosed