Scleral contact lenses are increasingly used in advanced keratoconus. The primary reason for their superior comfort and vision compared to corneal RGP lenses is that they:

• A Prevent corneal neovascularization
• B Are made of higher Dk material
• C Correct higher degrees of astigmatism optically
• D Vault the entire cornea and rest on the sclera ✓

Explanation

Scleral lenses are large-diameter rigid lenses (typically 15-22 mm) that vault the entire cornea and land on the less sensitive sclera. The fluid-filled reservoir between the lens and cornea neutralizes irregular astigmatism, while the scleral bearing surface eliminates mechanical irritation of the cone that makes corneal RGP lenses intolerable in advanced keratoconus.

Reference: Contact Lenses, 6th Edition (Phillips, Speedwell), 6th ed.

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Written and medically reviewed by the StethoPrep medical team.