Which material is associated with resistance to deposition among old hard lens materials?

Which material is associated with resistance to deposition among old hard lens materials?

• A. Fluoro-silicone/acrylate
• B. PMMA
• C. Silicone/acrylate
• D. Hydrogel

Answer: (A)

Deposition on lenses happens when tear-film proteins and lipids stick to the surface, and the ease of that sticking is governed by surface chemistry. Fluoro-silicone/acrylate lenses have fluorinated components that lower surface energy and reduce protein and lipid adsorption, making them notably more resistant to deposition than older hard lens materials. The classic PMMA hard lenses lack these fluorinated features, so tear components deposit more readily. Silicone/acrylate improves oxygen permeability but doesn’t provide the same anti-adhesive fluorinated surface, so its deposition resistance isn’t as strong as fluorosilicone/acrylate. Hydrogel lenses are water-rich and tend to deposit more readily as well, so they’re not the example of deposition resistance among old hard lens materials.

Deposition on lenses happens when tear-film proteins and lipids stick to the surface, and the ease of that sticking is governed by surface chemistry. Fluoro-silicone/acrylate lenses have fluorinated components that lower surface energy and reduce protein and lipid adsorption, making them notably more resistant to deposition than older hard lens materials. The classic PMMA hard lenses lack these fluorinated features, so tear components deposit more readily. Silicone/acrylate improves oxygen permeability but doesn’t provide the same anti-adhesive fluorinated surface, so its deposition resistance isn’t as strong as fluorosilicone/acrylate. Hydrogel lenses are water-rich and tend to deposit more readily as well, so they’re not the example of deposition resistance among old hard lens materials.