Compared to soft lenses, GP lenses typically have what advantage in deposits?

Compared to soft lenses, GP lenses typically have what advantage in deposits?

• A. No deposits ever
• B. Fewer deposits than soft CLs
• C. More deposits
• D. Equal deposits

Answer: (B)

The key idea is how lens materials interact with tear film to form deposits. Soft hydrogel lenses are water-rich and porous, so tear proteins, lipids, and minerals can adsorb and become embedded over time, leading to more deposits. Gas-permeable lenses are rigid with low water content and a nonporous surface, which resists absorption and makes deposits less likely to accumulate. When deposits do occur on GP lenses, they tend to be surface-based and easier to clean, so overall there are typically fewer deposits than with soft lenses.

The key idea is how lens materials interact with tear film to form deposits. Soft hydrogel lenses are water-rich and porous, so tear proteins, lipids, and minerals can adsorb and become embedded over time, leading to more deposits. Gas-permeable lenses are rigid with low water content and a nonporous surface, which resists absorption and makes deposits less likely to accumulate. When deposits do occur on GP lenses, they tend to be surface-based and easier to clean, so overall there are typically fewer deposits than with soft lenses.