Which statement about GP lenses is consistent with the described stable surface due to no water content?

Which statement about GP lenses is consistent with the described stable surface due to no water content?

• A. No water content
• B. High water content
• C. Irregular surface
• D. Low oxygen permeability

Answer: (A)

The main idea is how water content affects the lens surface stability. Gas-permeable lenses are rigid and contain little to no water, so they don’t swell or change their surface texture when exposed to tears. That lack of water uptake means the surface stays consistently smooth and stable, which matches the description of a stable surface due to no water content. If a lens had high water content, it would absorb tear film fluid and potentially swell or alter its surface, leading to instability. An irregular surface wouldn’t describe stability, and while oxygen permeability is important for GP lenses, it doesn’t explain stability driven by water content. So, no water content best accounts for the described stability.

The main idea is how water content affects the lens surface stability. Gas-permeable lenses are rigid and contain little to no water, so they don’t swell or change their surface texture when exposed to tears. That lack of water uptake means the surface stays consistently smooth and stable, which matches the description of a stable surface due to no water content. If a lens had high water content, it would absorb tear film fluid and potentially swell or alter its surface, leading to instability. An irregular surface wouldn’t describe stability, and while oxygen permeability is important for GP lenses, it doesn’t explain stability driven by water content. So, no water content best accounts for the described stability.