Bifocal glasses are a type of eyewear designed to help people see clearly at two different distances. They have two distinct optical zones: the upper part is for distance vision, while the lower part is for reading or close-up tasks. This design allows wearers to switch between seeing far away and reading without needing to change glasses. These glasses are commonly used by individuals experiencing presbyopia, a natural age-related condition that affects the ability to focus on close objects. Bifocal lenses can be made from various materials, including plastic and glass, and are available in different styles to suit personal preferences.