Quadrifocal is a term that refers to an eyeglass lens that has four distinct regions of focus. This type of lens is especially useful for individuals who need vision correction for both distance and reading, as well as for computer work and other activities that require intermediate vision. While synonyms for quadrifocal may not be very common, some other terms that could be used to describe this type of lens include multifocal, progressive, or varifocal lenses. These lenses are designed to provide clear vision at multiple distances, and may be particularly helpful for individuals with presbyopia or other age-related vision changes.