.OpiEnv                 Environment holding the state of the OPI
FT                      Full Threshold
MOCS                    Method of Constant Stimuli (MOCS)
QUESTP                  QUEST+
RtDbUnits               Response times to white-on-white Goldmann Size
                        III targets for 12 subjects in dB units
RtSigmaUnits            Response times to white-on-white Goldmann Size
                        III targets for 12 subjects in sigma units
ZEST                    ZEST
cdTodb                  Convert cd/m^2 to perimetric dB.
chooseOpi               Choose an implementation of the OPI
dbTocd                  Convert perimetric dB to cd/m^2
degTopix                Convert degrees to pixels for machine 'machine'
fourTwo.start           4-2 Staircase
opi.implementations     FOR INTERNAL USE ONLY
opiClose                Close using OPI
opiGetParams            Get OPI method parameters
opiInitialize           Initialize OPI
opiKineticStimulus      Stimulus parameter list
opiPresent              Use OPI to present stimulus
opiQueryDevice          Query device using OPI
opiSetBackground        Set background using OPI
opiStaticStimulus       Stimulus parameter list
opiTemporalStimulus     Stimulus parameter list
pixTodeg                Convert pixels to degrees for machine 'machine'
