plotComponentMatrix     General plotting function for multiple 24-2 or
                        30-2 visual field measurements together:
plotTDvalues            Value plotting function for 24-2 or 30-2 visual
                        field measurement:
plotTdProbabilities     Value plotting function for 24-2 or 30-2 visual
                        field measurement:
plotfield.normalized    Single plotting function for one 24-2 or 30-2
                        visual field measurement:
progression             general progression function
progression.cigts       CIGTS VF progression
progression.plr.nouri.2012
                        Nouri-Mahdavi 2012 VF progression
progression.schell2014
                        Schell 2014 VF progression
progression.vfi         progression according to VFI (significant
                        slope, p<=0.05)
vf.cigts                Combined Visual Field Series for General
                        Progression Method
vf.plr.nouri.2012       Combined Visual Field Series for General
                        Progression Method
vf.schell2014           Combined Visual Field Series for General
                        Progression Method
vf.vfi                  Combined Visual Field Series for General
                        Progression Method
vfseries                Combined Visual Field Series for General
                        Progression Method
