Which DK category is described as the most rigid due to dimensional stability and optical surface wettability?

Which DK category is described as the most rigid due to dimensional stability and optical surface wettability?

• A. High-DK
• B. Hyper-DK
• C. Low-DK
• D. Medium-DK

Answer: (C)

The main idea is that a lens material’s oxygen permeability (Dk) directly affects its stiffness. Low-DK materials transmit less oxygen, which makes the lens more rigid and less prone to bending on the eye. That rigidity brings dimensional stability and a consistently shaped optical surface, producing stable, predictable vision. Higher Dk materials are more flexible and tend to warp or conform to the cornea, reducing rigidity and stable optics. So describing the most rigid lens due to dimensional stability and a reliable optical surface points to the low-DK category.

The main idea is that a lens material’s oxygen permeability (Dk) directly affects its stiffness. Low-DK materials transmit less oxygen, which makes the lens more rigid and less prone to bending on the eye. That rigidity brings dimensional stability and a consistently shaped optical surface, producing stable, predictable vision. Higher Dk materials are more flexible and tend to warp or conform to the cornea, reducing rigidity and stable optics. So describing the most rigid lens due to dimensional stability and a reliable optical surface points to the low-DK category.