Trifocals are eyeglasses lenses that have three different sections for correcting vision at varying distances. Though the term "trifocals" is commonly used, there are several synonyms that people can use to describe this type of eyewear. Some of these synonyms include progressive lenses, graduated lenses, multifocals, and varifocals, depending on the region or manufacturer. While progressive, graduated, and multifocals are interchangeable terms, varifocals are a specific type of progressive lenses that offer a seamless transition between different lens powers. In summary, whether you are looking for trifocals, progressive lenses, graduated lenses, multifocals, or varifocals, these terms all refer to lenses that correct vision at different distances.