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Convert plus minus entries
snellensteps(x, smallstep)
Vector with VA entries of class snellen - needs to be in format xx/yy
if plusminus shall be considered as logmar equivalent
character vector of Snellen entries
https://en.wikipedia.org/wiki/Psychometric_function
Other VA converter: VAwrapper, plausibility_methods, va_methods, va_mixed(), va(), which_va()
VAwrapper
plausibility_methods
va_methods
va_mixed()
va()
which_va()