vfindex: visual field index

Description Usage Arguments Details Author(s) References See Also Examples

View source: R/vfindex.R

Description

calculates the visual field index. It can be parametrized by re-defining which locations go to which weighting regions and the actual weights per region.

Usage

1
vfindex( vf, td2pdcutoff = -20, perc = 5, vfiset = visualFields::vfidefault )

Arguments

vf

stimulus sensitivities in dBs

td2pdcutoff

cutof value for mean deviation. See perc below for an explanation of how both criteria work in conjunction. Default is -20

perc

percentile at which to check whether the 85th TD percentile is within normal limits or not. If it is not and mean deviation is lower than td2pdcutoff, then TD probability maps are to be used instead of PD probability maps. Default is 5th percentile

vfiset

settings to be applied for the calculation of VFI

Details

calculates the visual field index. It can be parametrized by re-defining which locations go to which weighting regions and the actual weights per region.

Author(s)

Ivan Marin-Franch

References

[1] B. Bengtsson and A. Heijl. A visual field index for calculation of glaucoma rate of progression. American Journal of Ophthalmology, 145, 2008

See Also

vfstats, vfstatspmap, vfindexpmap

Examples

1
  vfi <- vfindex( vf91016right )

visualFields documentation built on June 17, 2021, 5:06 p.m.