A cutting device for trimming a selected peripheral edge portion of a lens (33) secured in a mold (2) which comprises a housing (44) having an extended support member (46); a cutting means (56) having a cutting edge (58); said support member having a guiding edge (54) disposed a fixed distance from said cutting edge (58); and said guiding edge (54) and said cutting edge (58) being cooperatively associated so that when said guiding edge (54) contacts the outer wall or a mold (2), the cutting edge (58) will be positioned for the precision trimming of an edge portion of a lens (33) secured on the mold (2).