What happens to the optical quality when the base curve is flattened too much on an aspheric lens?

When the base curve of an aspheric lens is excessively flattened, the optical quality diminishes due to increased aberration. Aspheric lenses are designed to reduce optical distortions that can arise from traditional spherical shapes. They curve in a way that aims to provide a wider field of vision and improved image quality.

However, if the base curve is flattened beyond an optimal point, it can lead to the introduction of optical aberrations, such as spherical aberration, astigmatism, or other distortions. These aberrations can result in less clear vision, making it difficult for the wearer to focus clearly on objects. In contrast, maintaining an appropriate base curve helps to uphold the intended design advantages of aspheric lenses, which include better clarity and reduced visual distortion.

Hence, the relationship between the base curve and optical qualities strongly influences how effectively the lens performs in terms of vision correction.