Tandem is a para-cycling classification for cyclists that require a sighted pilot for a non-sighted rider. The UCI recommends this be coded as MB.PBS defined this group as "Athletes who are blind or visually impaired compete with no classification system. They ride tandem with a sighted “pilot.”" The Telegraph defined this classification in 2011 as "B: Athletes who are blind and visually impaired" British Cycling defines this classification as: "Blind or Visual Impaired (VI), TCB - from no light perception in either eye up to visual acuity of 6/60 and/or visual field of less than 20 degrees. Classification assessed in the best eye with the best correction (i.e. all athletes who use contact or corrective lenses must wear them for classification, whether they intend to wear them in competit