The Mechanics of Scleral Lenses: Providing a Continuous Moisture Reservoir for Your Eye

For people with severe dry eye, keratoconus, or irregular corneas, traditional contact lenses may not provide the comfort or visual stability they need. Scleral lenses work differently. Their larger design allows them to vault over the cornea while maintaining a reservoir of fluid between the lens and the eye, helping support hydration and clear vision throughout the day.

How Scleral Lenses Sit on the Eye

Unlike standard soft contact lenses that rest directly on the cornea, scleral lenses are larger and rest on the sclera - the white part of the eye. This design allows the center of the lens to arch over the cornea without placing pressure directly on its most sensitive surface.

Before insertion, the bowl of the scleral lens is filled with preservative-free saline solution. Once the lens is placed on the eye, that liquid remains between the back surface of the lens and the cornea. This creates the fluid reservoir that makes scleral lenses unique.

Why the Fluid Reservoir Matters

The liquid beneath a scleral lens serves several purposes. For patients with significant dry eye symptoms, it creates a consistently moist environment over the corneal surface while the lens is being worn. It can also help smooth an irregular cornea, allowing light to enter the eye more evenly.

The scleral lens design may offer advantages such as:

•          Maintaining moisture over the corneal surface

•          Protecting the cornea from exposure to air, wind, and environmental irritants

•          Creating a smoother optical surface for irregular corneas

•          Improving comfort for patients who struggle with traditional contact lenses

•          Providing more stable vision for certain complex prescriptions

Because the lens rests primarily on the sclera, it can also avoid some of the direct interaction between a traditional contact lens and a sensitive or irregular corneal surface.

Scleral Lenses and Severe Dry Eye

Healthy tears lubricate and protect the surface of the eye. When tear production is inadequate or tears evaporate too quickly, patients may experience burning, grittiness, redness, fluctuating vision, and contact lens discomfort.

Scleral lenses can be particularly useful when dry eye symptoms make conventional contact lenses difficult to tolerate. The saline reservoir helps keep the cornea hydrated while the lens also acts as a physical barrier between the eye and the surrounding environment.

Scleral lenses do not address every underlying cause of dry eye, so a complete evaluation remains important. Our eye doctors can examine the ocular surface, tear film, and overall eye health to determine whether scleral lenses should be part of your care plan.

Why Custom Scleral Lens Fitting Is Important

Scleral lenses require precise fitting because every eye has a different shape. We evaluate the cornea and surrounding scleral surface to determine the appropriate lens size, curvature, vault, and prescription.

The goal is to create enough space for a healthy fluid reservoir without excessive clearance or unwanted pressure on the eye. Follow-up visits allow us to assess vision, comfort, lens movement, and the health of the ocular surface.

If traditional contacts have become uncomfortable or severe dry eye is interfering with your daily vision, schedule an eye exam with Vision Care Associates - Grayslake to learn if scleral lenses are right for you. Contact our office in Grayslake, IL, by calling (847) 223-2000 to book your appointment.