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A fluid cushion contact lens is a specialized, rigid gas permeable (RGP) contact lens, often called a scleral lens, that is designed to vault over the entire cornea. The space between the back of the lens and the cornea is filled with a sterile saline solution, creating a protective cushion.
read more about fluid cushion contact lens ...The purpose of the liquid reservoir is to provide constant hydration and a smooth optical surface for the eye. The saline solution bathes the cornea throughout the day, preventing dryness and supporting tissue healing. This is crucial for patients with severe dry eye or corneal diseases, as it prevents friction. The rigid front surface of the lens acts as the new, perfectly shaped refractive surface, correcting distortion caused by the underlying irregularity.
The need for this lens type is defined by severe corneal irregularity or chronic dryness. It is often used to treat advanced keratoconus (cone-shaped cornea), where the irregular surface causes severe visual distortion that cannot be corrected by traditional lenses. It is also used for chronic, severe dry eye that resists standard eye drops. The patient experiences significant improvement in visual acuity and comfort upon fitting, making it a powerful therapeutic tool.
The lens corrects severe astigmatism or keratoconus by masking the irregular corneal surface. The fluid cushion fills the uneven space, and the rigid front surface of the lens becomes the new, perfectly smooth and spherical optical surface. This optical neutrality eliminates the distortion caused by the underlying corneal irregularity. The large size of the lens allows it to rest on the less sensitive sclera, bypassing the damaged or sensitive cornea entirely.
The lenses are made from highly oxygen-permeable, rigid gas permeable materials. This material is necessary because the lens is large and rests on the sclera (the white of the eye), requiring maximum oxygen flow to reach the cornea through the underlying tear film. The saline used is a non-preserved solution, which minimizes irritation.
Patient care involves strict hygiene. The lenses must be removed nightly, cleaned thoroughly, and refilled with fresh, sterile, non-preserved saline solution each morning before insertion. Maintaining saline purity is essential to prevent severe eye infections and protect the vulnerable corneal surface.
Yes, despite its large size, the lens rests on the less sensitive sclera, and the fluid cushion creates a comfortable sensation.
No, only sterile, preservative-free saline should be used to prevent severe irritation or infection.
No, a hybrid lens has a rigid center and a soft skirt. A fluid cushion lens is entirely rigid and vaults the cornea.
Fluid-cushion lenses (Scleral Lenses) are a medical treatment for "Keratoconus" or severe "Graft-vs-Host Disease." If you notice "mid-day fogging" or redness, your lens fit may be causing "Corneal Edema." See your specialist to ensure the lens isn't suctioning too tightly to the eye surface.
Scleral Lens Education Society. Scleral Lens Fit (sclerallens.org). 2024.
AAO. Scleral Contact Lenses (aao.org). 2024.
Review of Optometry. Scleral Lens Management (reviewofoptometry.com). 2023.
AOA. Specialty Contact Lenses (aoa.org). 2024.