Scleral Contact Lens

Scleral contacts are noticeably larger than standard gas permeable (GP) contacts and have a diameter equal to or greater than that of soft contact lenses. The smallest sclerals are approximately 14.5 mm in diameter, and the largest can be up to 24 mm.

How a scleral lens vaults over a misshapen cornea to help someone with keratoconus see better.
Scleral lens on the eye.
Large-diameter scleral and semi-scleral GP lenses rest on the sclera and vault over the misshapen cornea of a person with keratoconus, for better vision.

Typically, lenses that are 18 mm or smaller are subcategorized as mini-sclerals.

The average human cornea is approximately 11.8 millimeters in diameter, so even the smallest scleral contacts are designed to cover the entire corneal surface.

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