Which issue is more common with high modulus lenses?

Which issue is more common with high modulus lenses?

• A. Corneal staining
• B. Softer edge
• C. Greater hydration
• D. Edge lift, edge fluting, increased risk of certain complications

Answer: (D)

When a lens material has a high modulus, it is stiffer and less able to contour smoothly to the eye. That stiffness at the peripheral edge means the edge doesn’t settle flush against the cornea and sclera during wear. Instead, the edge tends to lift away from the surface—edge lift—and can form ridges or folds in the tear film along the edge, known as edge fluting. Blinking emphasizes this mismatch, increasing friction at the lens edge, disrupting tear exchange, and creating localized irritation. This combination raises the risk of corneal staining near the edge and other mechanical complications such as inflammation or discomfort. Softer, more conforming edges associated with lower modulus reduce these edge-related issues, and hydration level or edge softness alone don’t explain the edge complications seen with high modulus materials.

When a lens material has a high modulus, it is stiffer and less able to contour smoothly to the eye. That stiffness at the peripheral edge means the edge doesn’t settle flush against the cornea and sclera during wear. Instead, the edge tends to lift away from the surface—edge lift—and can form ridges or folds in the tear film along the edge, known as edge fluting. Blinking emphasizes this mismatch, increasing friction at the lens edge, disrupting tear exchange, and creating localized irritation. This combination raises the risk of corneal staining near the edge and other mechanical complications such as inflammation or discomfort. Softer, more conforming edges associated with lower modulus reduce these edge-related issues, and hydration level or edge softness alone don’t explain the edge complications seen with high modulus materials.