Extended Wear (EW) lenses can be worn for:

Extended Wear (EW) lenses are designed for continuous wear, allowing them to be worn for a specific period of days, typically up to one week, without needing to be removed for cleaning or overnight. This feature provides a convenient option for individuals who prefer not to insert and remove their contact lenses on a daily basis.

The material and design of EW lenses allow for increased oxygen permeability, which is crucial for maintaining corneal health during prolonged wear. They are formulated to minimize the risk of complications associated with extended use compared to regular contact lenses.

Wearing them for a few hours only does not utilize the advantage of their design, as EW lenses are specifically intended for continuous wear over several days. Furthermore, while they can be worn continuously, they are not designed for indefinite wear without removal; the eyes still need time to rest, and adherence to manufacturer guidelines on wearing schedules is essential for eye health. Additionally, while some lenses may allow wear during sleeping hours, this option does not accurately describe the intended use of EW lenses, which can be worn throughout the day and night for the specified duration.