Which type of aberration affects image shape when wearing high minus lenses?

The type of aberration that affects image shape when wearing high minus lenses is barrel distortion. High minus lenses, or those with a strong negative power, typically cause images that move toward the center of the lens to appear larger, creating a visual effect similar to that of looking through a barrel. This distortion can lead to straight lines appearing curved outward, which is characteristic of barrel distortion.

Barrel distortion is significant in high minus lenses because they not only magnify the wearer's vision but also impact the peripheral aspects of their visual field. As a result, objects at the edges may appear distorted, causing potential visual discomfort. This type of aberration is particularly pronounced in higher prescriptions, where the power of the lens significantly alters the images viewed.

Understanding how barrel distortion works is essential for those who work with optics and can help practitioners ensure that patients are adequately educated about what to expect when adapting to high minus lenses.