Scleral Lenses for Dry Eye

A scleral lens is a large-diameter rigid gas-permeable contact lens. But unlike a conventional contact lens, it is designed to vault over the cornea. Instead of resting primarily on the cornea, the lens lands on the sclera — the white part of the eye.

That creates a space between the back surface of the lens and the cornea. Before the lens is inserted, this space is filled with sterile preservative-free solution. Once the lens is on the eye, that liquid remains trapped between the lens and the cornea.

So instead of the cornea being exposed directly to the normal tear film and environment, it sits beneath a fluid reservoir. This reservoir is one of the central reasons scleral lenses are used in severe ocular-surface disease.

Very different. A conventional soft contact lens lies directly over the cornea and interacts continuously with the tear film. It can also lose water and become dehydrated during wear.

A scleral lens is much larger and designed to vault the corneal surface. So the central cornea is not simply rubbing against the lens. Instead:

lens→fluid reservoir→cornea

This creates a protected microenvironment over the ocular surface.

Think about what happens in severe dry eye. The corneal surface may repeatedly experience:

• •tear-film breakup
• •evaporation
• •friction from blinking
• •exposure to air
• •hyperosmolar stress
• •and sometimes epithelial damage.

Artificial tears can temporarily improve that environment. But then you blink. The drop drains. Some evaporates. The unstable tear film returns.

A scleral lens changes the situation much more dramatically. The cornea can remain immersed in fluid while the lens is being worn. At the same time, the lens shields it from direct environmental exposure.

This is why scleral lenses can provide both hydration and physical protection. Reviews describe benefits including protection from evaporation, support of corneal epithelial healing and improved visual function in selected ocular-surface disease.

Not necessarily. This is an important difference from the normal tear film. With an ordinary eye:

tears are produced→spread by blinking→evaporate or drain→are replenished

Under a scleral lens, tear exchange can be relatively limited. The fluid reservoir therefore creates a much more protected and comparatively stable environment. But this also creates some of the challenges of scleral-lens wear, which we will come back to.

It can essentially shield the covered corneal surface from direct tear evaporation while the lens is in place. That is one reason scleral lenses can be particularly useful when exposure and evaporation are severe.

But this does not mean the entire ocular surface stops evaporating. The conjunctiva outside the lens remains exposed. And the eyelids, meibomian glands and natural tear film still exist around the device.

So it is better to say that the scleral lens creates a protected fluid environment over the cornea, rather than that the eye no longer experiences evaporation.

Usually, no. And this may be the most important concept in this article.

Suppose someone has severe MGD. A scleral lens can protect the cornea from the consequences of tear-film instability. But it does not necessarily unblock the meibomian glands, normalize meibum or restore lost glands.

Suppose someone has severe aqueous deficiency. The lens can provide a fluid reservoir. But it does not necessarily make the lacrimal gland produce more tears.

Suppose someone has exposure from incomplete eyelid closure. The lens can protect the cornea. But it does not make the eyelid close normally.

So scleral lenses are often a powerful example of compensatory treatment. And compensatory treatment is not inferior treatment. Sometimes protecting tissue from the consequences of a disease is enormously valuable even when the original cause cannot yet be corrected.

Treating Dry Eye: Start with the Target

Scleral lenses are used across a wide range of ocular-surface and corneal conditions. These include severe ocular-surface disease associated with conditions such as:

• •dry eye disease
• •Sjögren disease
• •graft-versus-host disease
• •Stevens-Johnson syndrome
• •neurotrophic corneal disease
• •exposure-related disease
• •and other complex ocular-surface disorders.

They are also widely used for corneal irregularity, including conditions such as keratoconus, because the fluid reservoir can create a smoother optical surface.

So scleral lenses can potentially serve two functions: ocular-surface protection and visual rehabilitation.

Historically, they have generally been considered an advanced treatment. But there is increasing interest in whether selected patients with dry eye could benefit earlier.

This is an area where we need to be careful. A 2024 review specifically examined scleral lenses for dry eye without associated corneal irregularity and concluded that the evidence remains relatively sparse, despite reported benefits and increasing clinical interest.

So “scleral lenses can help dry eye” is well supported clinically. But “everyone with moderate dry eye should move to scleral lenses early” is not established.

Remember something important from our earlier articles: the tear film is part of the optical system of the eye. If the corneal surface or tear film is irregular, light entering the eye is distorted.

A scleral lens creates a smooth front optical surface while the fluid reservoir fills the space over the irregular cornea. That can dramatically improve visual quality in patients with corneal irregularity. Even in dry eye without major structural corneal irregularity, reducing tear-film breakup can potentially make vision more stable.

So the patient may notice not only less burning but also less fluctuating vision.

The Tear Film: why it matters for vision

They can create an environment favorable to epithelial protection and healing. The fluid reservoir continuously bathes the cornea, while the lens provides mechanical protection from the external environment and eyelid interaction. This is one reason scleral lenses and PROSE devices are used in severe ocular-surface disease.

But again, creating an environment that supports healing is not the same as correcting whatever caused the epithelial damage. If severe exposure, infection, inflammation or another destructive process continues, that process may still need separate treatment.

You may encounter the term PROSE when reading about severe ocular-surface disease. PROSE stands for Prosthetic Replacement of the Ocular Surface Ecosystem. It refers to a highly customized therapeutic scleral-device approach used for complex corneal and ocular-surface disease.

The physical concept is closely related to scleral lenses: a gas-permeable device vaults the cornea and maintains a fluid reservoir over it. Modern reviews discuss scleral lenses and PROSE together because they share these fundamental principles.

At first, it can be. Unlike a small contact lens, a scleral lens has to be filled completely with solution before insertion. The patient generally fills the bowl of the lens, keeps it facing upward, bends forward and places it onto the eye without spilling the fluid. If an air bubble becomes trapped beneath the lens, the lens usually needs to be removed and reinserted.

For someone new to scleral lenses, this can feel absurdly complicated. But many patients become proficient with practice. Still, handling ability matters when deciding whether scleral lenses are practical for a particular person.

The reservoir is generally filled with a sterile, preservative-free solution appropriate for scleral-lens filling. This matters because the solution may remain in prolonged contact with the cornea. Preserved multipurpose contact-lens solution is not simply interchangeable with an appropriate filling solution.

The solution placed under the lens becomes part of the ocular environment for hours. There is even research investigating whether the ionic composition of filling solutions affects comfort and symptoms during scleral-lens wear.

Sometimes clinicians modify the filling strategy for particular patients. But this should not turn into “anything soothing can go into the scleral lens.” The substance will be trapped against the cornea for an extended period. So compatibility, sterility, preservatives, viscosity and the specific lens fit all matter.

The filling regimen should be discussed with the clinician fitting the lens.

Artificial Tears & Dry Eye Drops

This is one of the classic scleral-lens problems. A patient puts the lenses in. Vision is clear. Several hours later, everything looks cloudy or foggy. When the lens is removed, the fluid underneath may contain visible debris.

This phenomenon is commonly called midday fogging. It can result from particulate material accumulating in the post-lens fluid reservoir. Some patients need to remove the lens during the day, clean it, refill it and reinsert it. Reviews of scleral lenses for dry eye identify midday fogging as one of the important practical limitations of treatment.

Not necessarily. The material may originate from the ocular surface and tear environment itself. Lens fit, inflammation, tear exchange and other factors may influence how much material enters or accumulates beneath the lens.

So repeated fogging is not always solved simply by cleaning the lens better. The fit and ocular surface may need reassessment.

They can create problems if they are poorly fitted, poorly tolerated or improperly managed. Possible issues include:

• •fogging
• •surface deposits
• •poor lens wettability
• •conjunctival compression
• •redness
• •discomfort
• •difficulty inserting or removing the lens
• •and, importantly, concerns about corneal oxygen supply.

So a scleral lens is not simply a protective bowl of water with no biological consequences. It is a medical device sitting on the eye for many hours.

The cornea has no blood vessels supplying oxygen directly to its center. It relies heavily on oxygen from the atmosphere. A scleral lens creates two additional barriers: the lens itself and the fluid reservoir beneath it.

Modern scleral lenses are made from highly oxygen-permeable materials. But oxygen still has to pass through the lens and the fluid reservoir to reach the cornea. That is why both lens material/thickness and reservoir thickness matter. Excessive clearance beneath the lens can reduce oxygen availability and increase the risk of corneal hypoxia and swelling.

Exactly. This is a beautiful example of why more treatment does not automatically mean better treatment.

It might seem logical that if fluid protects the cornea, then a thicker fluid reservoir must provide even more protection. But an excessively thick reservoir creates a longer diffusion path for oxygen. It can also contribute to:

• •debris accumulation
• •reduced optical quality
• •and fitting problems.

The goal is not maximum fluid. The goal is enough clearance to protect the cornea while maintaining appropriate physiology.

Yes, inadequate oxygen delivery can contribute to corneal swelling. The risk depends on factors including:

• •lens oxygen permeability
• •lens thickness
• •fluid-reservoir thickness
• •wear time
• •lens fit
• •and the health of the patient’s cornea.

A healthy cornea and a compromised cornea may tolerate the same device differently. This is one reason scleral lenses require professional fitting and follow-up rather than simply ordering the correct diameter online.

Generally, scleral lenses used for ocular-surface disease are designed for daily wear, not routine overnight wear. Closing the eyelids already reduces oxygen availability to the cornea. Adding a lens and fluid reservoir introduces additional resistance to oxygen transmission.

Specific therapeutic situations may involve specialized medical protocols, but routine overnight wear should not be assumed to be safe simply because the lens feels protective.

As with contact-lens wear generally, poor hygiene can increase infection risk. The lens is repeatedly handled, filled, inserted, removed and stored. The filling solution also comes into prolonged contact with the cornea.

So appropriate hygiene and sterile filling practices matter. A lens that protects the ocular surface when used correctly can become a source of complications if handling is unsafe.

That can happen. And biologically it makes perfect sense. While the lens is in place, the cornea is protected. Remove the lens, and the original tear-film environment returns. If the underlying MGD, aqueous deficiency, exposure or other driver has not changed, symptoms can return.

This does not mean the scleral lens failed. It means the device was doing exactly what it was designed to do: creating a temporary protected environment.

Sometimes the ocular surface itself may become healthier because it is no longer repeatedly exposed to the same degree of desiccating stress and mechanical trauma. Epithelial healing may occur. Inflammation associated with ongoing surface injury may decrease. That can produce improvement beyond immediate comfort while the lens is worn.

But we should distinguish that from claiming that the lens has necessarily corrected MGD, lacrimal gland dysfunction, abnormal blinking or another upstream cause. Those may remain.

Potentially, yes. This is one of their particularly intuitive uses. If part of the cornea is inadequately protected because of lagophthalmos, facial nerve dysfunction or another eyelid-closure problem, a scleral device can physically shield the cornea and maintain fluid over it.

TFOS DEWS II described scleral-lens use as an alternative to tarsorrhaphy in a small case series of patients with lagophthalmos and corneal anesthesia after facial nerve paralysis. Again, the lens does not repair the facial nerve. It protects the tissue affected by the problem.

Eyelid Closure, Lagophthalmos & Exposure Dry Eye

This is more complicated. A scleral lens can reduce environmental and mechanical stimulation of the ocular surface. Some patients with pain therefore experience significant relief. But others with neuropathic pain may not tolerate a lens at all, or their pain may persist despite excellent surface protection.

That makes sense because neuropathic pain can involve altered sensory processing rather than simply ongoing surface damage. So “scleral lenses help my pain” does not prove that the pain was purely caused by dryness. And “scleral lenses do not help my pain” does not necessarily mean the ocular surface is healthy.

We will discuss this distinction more fully in the nervous-system article.

When Dry Eye Symptoms May Involve the Nervous System

For some patients, remarkably so. This can seem counterintuitive. How could an enormous rigid lens be comfortable in an eye that cannot tolerate ordinary contact lenses?

Because the mechanics are completely different. A well-fitted scleral lens does not behave like a dehydrating soft lens moving directly across the cornea. It vaults the sensitive corneal surface and lands on less sensitive scleral/conjunctival tissue. And the cornea remains immersed in fluid. For a severely compromised ocular surface, that can actually feel much better than having nothing on the eye at all.

But comfort varies greatly between individuals.

No. Some patients struggle with:

• •lens awareness
• •insertion and removal
• •fogging
• •conjunctival sensitivity
• •lens surface dryness
• •cost
• •or simply the daily burden of using them.

The 2024 review of scleral lenses for dry eye emphasizes both potential benefits and practical challenges, and also notes that evidence specifically for uncomplicated dry eye remains limited.

This is important because an impressive medical technology is only useful if the patient can realistically live with it.

Unlike buying ordinary glasses, scleral-lens fitting can require multiple measurements, trial lenses and adjustments. The clinician evaluates things such as:

• •corneal clearance
• •limbal clearance
• •scleral alignment
• •lens centration
• •fluid-reservoir thickness
• •conjunctival compression
• •and visual performance.

And the lens needs to be evaluated not only immediately after insertion but after it has settled on the eye. This is why scleral-lens fitting is a specialized process.

Again, start with the treatment target. Possible outcomes include:

• •less pain and dryness
• •less corneal staining
• •healing of epithelial defects
• •better visual stability
• •greater tolerance of wind or dry environments
• •longer comfortable visual activity
• •better quality of life.

But we should also monitor:

• •corneal health
• •edema
• •lens fit
• •fogging
• •redness
• •and wear tolerance.

A lens can feel comfortable while still requiring physiological monitoring.

How to Make Treatment Decisions