Scleral lenses and traditional rigid gas-permeable (RGP) lenses are both made from the same family of firm, oxygen-friendly plastics. Yet they feel worlds apart on the eye. If your doctor has offered you a choice — or if you've struggled with "hard" lenses before — here's how the two compare.
Size and where they land
A traditional corneal RGP lens is small, about 9–11 mm, and sits directly on the cornea. A scleral lens is much larger and vaults over the cornea to rest on the sclera. That's the root of nearly every other difference between them.
Comfort
This is where scleral lenses tend to win. Because a corneal RGP sits on the cornea and moves with each blink, many wearers feel the lens edge and need weeks to adapt. Scleral lenses rest on the far less sensitive white of the eye and stay put, so most patients find them comfortable almost immediately — even people who couldn't tolerate corneal RGPs.
Stability
Small RGP lenses can slide, decenter, or pop out during sports or vigorous activity. Scleral lenses are large and stable, making them a better choice for active lifestyles and for eyes where lens position is critical.
Dry eye protection
Corneal RGPs do nothing to hydrate the eye. Scleral lenses carry a fluid reservoir that keeps the cornea bathed in saline all day — a decisive advantage for anyone with dryness.
When an RGP still makes sense
Corneal RGPs aren't obsolete. They're less expensive, quicker to fit, easier to handle for some patients, and perfectly adequate for many mild-to-moderate irregular corneas. For a smaller cone or modest astigmatism, an RGP may be all you need.
The takeaway
Think of it as a spectrum: corneal RGPs are the compact, economical option for milder cases, while scleral lenses are the premium, high-comfort option for complex eyes and dry-eye sufferers. Dr. Salley fits both at CFE Memphis and will recommend whichever gives you the best combination of comfort, clarity, and value.
Want an expert opinion on which rigid lens fits your eyes? Schedule a specialty lens consult in Memphis today.