Freeform lenses are optical components that have complex geometries and non-spherical surfaces, allowing for customization and optimization of the lens shape to achieve specific optical properties. These lenses are typically used in applications where traditional spherical lenses may not provide the desired performance, such as in imaging systems, laser systems, or high-precision optical instruments. Freeform lenses can help to reduce aberrations, improve image quality, and enhance overall optical performance. They are designed using advanced computer-aided design software and can be manufactured using precision machining or 3D printing techniques.