What defines Disposable contact lenses?

Disposable contact lenses are defined as lenses that are worn for a specific period and then discarded. This design allows for the lens to be replaced regularly, which can help maintain eye health and comfort. The primary advantage of disposable lenses is their convenience and hygiene, as each new pair reduces the buildup of deposits and bacteria that can accumulate on lenses over time.

Though other choices may describe features associated with certain types of contact lenses, they do not accurately characterize disposables. For instance, daily and overnight wear pertains to how frequently the lenses can be worn, while the design for indefinite use without cleaning does not align with the disposable nature that emphasizes regular replacement. Similarly, lenses that are only worn during sleeping hours would not fit into the disposable category, as this would not encompass the broader application of disposables. Thus, the definition provided in the correct choice best captures what distinguishes disposable contact lenses from other types.