What is a characteristic of monthly disposable lenses?

Monthly disposable lenses are designed for extended wear, allowing them to be used for up to 30 days. This duration refers to the lens's intended lifespan when used daily and disposed of at the end of the month. They are created with materials that allow for oxygen permeability, which helps maintain eye health over the month they are worn. However, it's important to note that the recommended maximum wear period is typically one day each time they are used, and they must be removed, cleaned, and stored at night, although some brands may allow for extended wear. The designation of "monthly" emphasizes their usability over a longer term compared to daily or bi-weekly lenses, making them a convenient choice for those who prefer not to change their lenses frequently.