What is the primary purpose of applying a plasma treatment to GP lenses?

What is the primary purpose of applying a plasma treatment to GP lenses?

• A. removes manufacturing contaminants, polishing residues
• B. increases lens color
• C. adds UV blocking
• D. decreases oxygen permeability

Answer: (A)

Plasma treatment on GP lenses is used to clean the surface by removing contaminants from manufacturing and polishing. The ionized gas interacts with residues on the lens surface, breaking down organic films and turning them into volatile molecules that are swept away, leaving a clean, higher-energy surface. This cleaner surface can improve tear film spread (wettability) and can help any subsequent coatings or surface treatments adhere better, contributing to comfort and deposit resistance during wear. The other options don’t fit because plasma cleaning doesn’t change the lens color, doesn’t add UV-blocking properties, and doesn’t alter the bulk oxygen permeability of the lens material—oxygen permeability is a property of the material itself, not a result of surface cleaning.

Plasma treatment on GP lenses is used to clean the surface by removing contaminants from manufacturing and polishing. The ionized gas interacts with residues on the lens surface, breaking down organic films and turning them into volatile molecules that are swept away, leaving a clean, higher-energy surface. This cleaner surface can improve tear film spread (wettability) and can help any subsequent coatings or surface treatments adhere better, contributing to comfort and deposit resistance during wear. The other options don’t fit because plasma cleaning doesn’t change the lens color, doesn’t add UV-blocking properties, and doesn’t alter the bulk oxygen permeability of the lens material—oxygen permeability is a property of the material itself, not a result of surface cleaning.