Which process adds stability to contact lens materials?

Which process adds stability to contact lens materials?

• A. Irradiation
• B. Crosslinking
• C. Hydrogenation
• D. Plasticization

Answer: (B)

Stability in contact lens materials comes from forming a crosslinked polymer network. Crosslinking creates covalent bonds between adjacent polymer chains, forming a three‑dimensional scaffold that resists dissolution in tear fluid and limits excessive swelling. This network also boosts mechanical strength and helps the lens maintain its shape during blinking, handling, and wear, all while balancing water content and oxygen permeability. While irradiation can be used to initiate crosslinking or sterilize the material, the key process that directly adds stability is crosslinking itself. Hydrogenation saturates double bonds and doesn’t create the network needed for stability, and plasticization makes the material softer and more prone to deformation, reducing stability.

Stability in contact lens materials comes from forming a crosslinked polymer network. Crosslinking creates covalent bonds between adjacent polymer chains, forming a three‑dimensional scaffold that resists dissolution in tear fluid and limits excessive swelling. This network also boosts mechanical strength and helps the lens maintain its shape during blinking, handling, and wear, all while balancing water content and oxygen permeability. While irradiation can be used to initiate crosslinking or sterilize the material, the key process that directly adds stability is crosslinking itself. Hydrogenation saturates double bonds and doesn’t create the network needed for stability, and plasticization makes the material softer and more prone to deformation, reducing stability.