what is a progressive lens

Progressive lenses are a type of eyeglass lens that contain multiple prescriptions or "powers" to help people see clearly at different distances without having to switch between different pairs of glasses. They are also known as multifocal lenses, varifocals, or no-line bifocals. Unlike traditional bifocal or trifocal lenses, progressive lenses have no visible lines separating the different prescriptions, giving them a more seamless look. Progressive lenses are especially useful for people with presbyopia, a condition that affects the eyes ability to focus on close objects as they age. However, they can be more expensive than single or multifocal glasses due to the extra time and effort required to create a lens with multiple prescriptions and no lines. It may also take some time to adjust to progressive lenses and find the correct sweet spot for certain distances.