Vaulting the Surface: The Medical Physics Behind Custom Scleral Contact Lenses

For patients with keratoconus, irregular corneas, severe dry eye, or other complex vision needs, traditional contact lenses do not always provide the clarity or comfort they need. Custom scleral contact lenses work differently. Rather than resting directly on the cornea, these larger lenses vault over its surface and rest on the sclera, the white portion of the eye. At First Class Eye Care in Duluth, we use advanced measurements to customize scleral lenses to the unique shape of each patient's eyes.

How Scleral Lenses Vault the Cornea

The defining feature of a scleral lens is its vault. The lens is designed with enough depth to clear the cornea rather than touching it. Before insertion, the space beneath the lens is filled with sterile saline solution, creating a fluid reservoir between the lens and corneal surface.

This design can provide several important benefits:

•          Creates a smooth optical surface over an irregular cornea

•          Keeps the corneal surface continuously bathed in fluid while the lens is worn

•          Reduces direct contact with the sensitive cornea

•          Provides a stable lens position by resting on the sclera

•          Helps deliver clearer vision when glasses or standard contacts are insufficient

The Optics Behind Clearer Vision

Conditions such as keratoconus can change the shape of the cornea, causing light to bend unevenly as it enters the eye. This irregular refraction can result in distortion, glare, ghosting, or blurred vision that glasses may not fully correct.

A rigid gas-permeable scleral lens creates a more regular front optical surface. The fluid layer beneath the lens helps neutralize some of the irregularities of the underlying cornea. As light passes through this smoother optical system, it can be focused more consistently toward the retina. This is one reason custom scleral contact lenses can provide significant visual improvement for patients with complex corneal shapes.

Why Precise Scleral Lens Measurements Matter

Successful scleral lens fitting involves much more than selecting a lens diameter and prescription. The shape of the cornea, the contour of the sclera, lens clearance, and overall alignment all influence how the lens performs.

At First Class Eye Care, we use the Eaglet Scleral Profiler to capture detailed measurements of both the cornea and sclera. This technology gives us a precise representation of the eye's surface so we can design a more customized fit.

A carefully fitted lens should maintain appropriate clearance over the cornea while distributing its support across the sclera. Follow-up visits allow us to evaluate lens position, vision, comfort, and overall fit before determining whether adjustments are needed.

Custom Scleral Lenses in Duluth, GA

Scleral lenses combine optical science, advanced imaging, and individualized fitting to address vision needs that standard lenses may not adequately manage. For patients with keratoconus, irregular astigmatism, corneal changes, or significant dry eye, a scleral lens evaluation can determine whether this specialized technology is appropriate.

Schedule a contact lens exam with First Class Eye Care to find out if custom scleral lenses are the right fit for your vision needs. Visit our office in Duluth, GA, or call (404) 793-3937 to book an appointment today.