What is a key characteristic of gas permeable contact lenses?

Gas permeable contact lenses are designed to allow oxygen to pass through the lens to the cornea, which is vital for maintaining eye health. Unlike hydrophilic or water-loving materials, gas permeable lenses are primarily made from rigid, hydrophobic materials. This hydrophobic nature is a key characteristic because it allows the lenses to retain their form and provide clarity of vision while still permitting oxygen transmission.

To ensure comfort and adequate wetting on the eye, these lenses often require the use of a wetting agent. This adaptation helps bridge the gap between their rigid structure and the moisture needs of the eye, enhancing overall comfort for the wearer.

In contrast, hydrophilic lenses are predominantly made from soft materials that attract water, making them different in composition and function from gas permeable types. Disposable options might apply to both types of lenses but are not exclusive to gas permeable lenses. Additionally, gas permeable lenses are engineered specifically to facilitate oxygen flow, contradicting the assertion that they do not allow oxygen flow.