Gas Permeable Contact Lenses – Introduction Practice Test

Plasma treatments are used on almost all GP lenses.

True False Not sure Rarely

Correct Answer:

True

Explanation:

Plasma treatment changes the surface energy of a lens. Gas-permeable lenses are often made from hydrophobic polymers, so applying plasma adds polar groups to the surface and removes contaminants. This increases wettability, helping tears spread evenly across the lens and reducing dry spots or edge awareness, which boosts comfort and tear-film stability during wear. Because keeping the lens surface consistently wet and comfortable is so important for GP materials, manufacturers routinely use plasma treatment in the manufacturing process. So the statement is true: plasma treatments are used on almost all GP lenses. There may be rare exceptions with older materials or alternative processes, but in modern practice this is standard.

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