Trifocal lenses are eyeglass lenses that have three distinct areas with different focal lengths for near, intermediate, and distance vision. There are several synonyms for trifocal lenses, including progressive lenses, varifocal lenses, multi-focal lenses, and tri-focal lenses. These lenses are commonly used by individuals who struggle with presbyopia, which is the natural process of aging that causes changes in the eye's ability to focus on different distances. Trifocal lenses offer a convenient solution for individuals who need different levels of magnification for close-up work, computer use, and distance vision without having to switch glasses. Choosing the right type of lens depends on individual preferences and requirements.