Which GP design vaults over the cornea with a large diameter?

Which GP design vaults over the cornea with a large diameter?

• A. Hybrid
• B. Corneal GP multicurve
• C. Scleral
• D. Corneal GP spherical

Answer: (C)

Vaulting over the cornea with a large diameter is a defining feature of scleral GP lenses. These lenses are much bigger than standard corneal lenses, so their edge lands on the sclera rather than on the cornea. The entire central portion clears the corneal surface, creating a space between the cornea and the lens that fills with tear film. That tear-filled vault acts as a smooth optical and therapeutic reservoir, which is especially helpful when the cornea is irregular or damaged. In contrast, corneal GP designs (whether spherical or multicurve) and hybrid lenses sit on the corneal surface or have a soft component that blends with the cornea. Their smaller diameters mean they don’t vault the cornea; they contact the corneal surface instead, so they don’t create the same post-lens tear reservoir.

Vaulting over the cornea with a large diameter is a defining feature of scleral GP lenses. These lenses are much bigger than standard corneal lenses, so their edge lands on the sclera rather than on the cornea. The entire central portion clears the corneal surface, creating a space between the cornea and the lens that fills with tear film. That tear-filled vault acts as a smooth optical and therapeutic reservoir, which is especially helpful when the cornea is irregular or damaged.

In contrast, corneal GP designs (whether spherical or multicurve) and hybrid lenses sit on the corneal surface or have a soft component that blends with the cornea. Their smaller diameters mean they don’t vault the cornea; they contact the corneal surface instead, so they don’t create the same post-lens tear reservoir.