What is the difference between single vision and multifocal lenses?

The distinction between single vision and multifocal lenses primarily lies in the structure of the prescriptions they provide within the lenses. Single vision lenses have a uniform prescription across the entire lens, meaning they are designed to correct a specific vision problem, whether it be for distance, reading, or any single visual requirement. This makes them suitable for individuals who do not require correction for multiple distances.

On the other hand, multifocal lenses, such as bifocals or progressive lenses, feature multiple optical zones for different viewing distances—all within a single lens. This allows wearers to see clearly at various ranges, such as distance, intermediate, and near vision, making them an excellent solution for presbyopia, which occurs with aging.

Other choices may suggest price considerations, limitations of use, or specific conditions that aren't representative of the core technical differences between these lens types. Understanding the unique function of single vision lenses as having one prescription helps clarify why they suit particular vision correction needs without the complications of progressive focal changes.