Progressive lenses are a type of eyeglass lens designed to correct vision at multiple distances. Unlike traditional bifocals, which have a visible line separating different prescriptions, progressive lenses provide a smooth transition between different focal points, allowing wearers to see clearly at near, intermediate, and far distances. These lenses are particularly beneficial for people with presbyopia, a common age-related condition that affects the ability to focus on close objects. By offering a gradual change in lens power, progressive lenses help users maintain a natural line of sight without the abrupt changes associated with other lens types.