A multifocal lens device is disclosed. The image forming unit is produced by forming the rectangular concave portion along the longitudinal direction; which contains a handle made of an elastic rectangular-shaped plate; providing elongated holes extending in the longitudinal direction at both ends of the handle; and engaging the elongated holes with anchoring member provided at the concave portion. All lights emitted from the light-emitting source can enter the GRIN lens, and the loss of the light can thereby be reduced. Each pair of twist vectors is combined into one twist vector during evaluation, according to weights based on proximity to parametric boundaries. A request to display at least some of the captured interaction information may be received. Other aspects of the invention are new compounds of formula II and formula III and their preparation.