What is the purpose of prescribing bifocal lenses?

The purpose of prescribing bifocal lenses is to correct both distance and near vision for presbyopic patients. As individuals age, the ability to focus on close objects diminishes, a condition known as presbyopia. Bifocal lenses feature two different optical powers, allowing the wearer to see clearly at both distance and near ranges without needing to switch glasses. This design facilitates everyday activities, such as reading, while still accommodating the need to see objects at a distance.

In contrast, enhancing night vision and preventing eye strain are typically addressed with different types of lenses or interventions that focus on specific visual impairments rather than the dual visual needs that bifocal lenses address. Improving peripheral vision may involve specialized lenses or modifications that are unrelated to the bifocal design, as bifocals are intended primarily for conditions associated with presbyopia. Thus, the primary and correct purpose of bifocal lenses is indeed to aid those who require correction for both distance and near vision simultaneously.