ommia

Example:In contrast to the compound eyes of insects which have ommatidia, the simple eye of a mammal like a cat provides a single, focused image.

Definition:An eye that uses a single lens or transparent cover instead of a facet to form an image.

Example:The cornea of a human eye, while critical for vision, serves an analogous but distinct function compared to the crystalline lenses within ommatidia.

Definition:Structures that are not involved in the process of forming images, such as the cornea in mammals.