5 Key Takeaways

• 1

  Rigid gas permeable (RGP) materials are defined by oxygen permeability, surface chemistry, hardness/modulus, and specific gravity, impacting patient comfort.

• 2

  Higher-Dk materials optimize oxygen transmissibility, making them preferable for higher-plus and higher-minus power lenses.

• 3

  Surface wettability, influenced by lens chemistry, enhances comfort and reduces deposits, especially for patients with ocular surface disease.

• 4

  Balancing Dk and modulus is crucial for patients with higher degrees of corneal toricity to prevent lens flexure.

• 5

  Specific gravity affects lens mass and centration; reducing SG can improve fit for high-plus lenses.