.opi_env                Global environment for OPI to hold machine
                        specific constants, etc.
FT                      Full Threshold
KTPsi                   An implementation of Kontsevich and Tyler Psi
                        algorithm.
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               chooseOPI selects an OPI machine to use.
dbTocd                  Convert perimetric dB to cd/m^2
degTopix                Convert degrees to pixels for machine 'machine'
fourTwo.start           4-2 Staircase
kowa.presentKinetic     Present kinetic on Kowa AP7000 (internal use)
kowa.presentStatic      Present static on Kowa AP7000 (internal use)
kowa.presentTemporal    Present temporal stim on Kowa AP7000 (internal
                        use)
octo900.presentKinetic
                        Present Kinetic stimuli on O900 (internal use)
octo900.presentStatic   Present static on O900 (internal use)
octo900.presentTemporal
                        Present Temporal stimuli on O900 (internal use)
open_socket             Open a socket on ip and port.
opiClose                Calls opiClose_for_MACHINE as appropriate.
opiClose_for_Compass    Implementation of opiClose for the Compass
                        machine.
opiClose_for_Display    Implementation of opiClose for the Display
                        machine.
opiClose_for_Envision   Implementation of opiClose for the Envision
                        HMP.
opiClose_for_ImoVifa    Implementation of opiClose for the ImoVifa
                        machine.
opiClose_for_KowaAP7000
                        Implementation of opiClose for the Kowa AP7000
                        machine.
opiClose_for_MAIA       Implementation of opiClose for the MAIA
                        machine.
opiClose_for_O600       Implementation of opiClose for the O600
                        machine.
opiClose_for_Octopus900
                        Implementation of opiClose for the Octopus900
                        machine.
opiClose_for_PhoneHMD   Implementation of opiClose for the PhoneHMD
                        machine.
opiClose_for_PicoVR     Implementation of opiClose for the PicoVR
                        machine.
opiClose_for_SimGaussian
                        opiClose_for_SimGaussian
opiClose_for_SimHenson
                        opiClose_for_SimHenson
opiClose_for_SimHensonRT
                        opiClose_for_SimHensonRT
opiClose_for_SimNo      opiClose_for_SimNo
opiClose_for_SimYes     opiClose_for_SimYes
opiInitialise           Calls opiInitialise_for_MACHINE as appropriate.
opiInitialise_for_Compass
                        Implementation of opiInitialise for the Compass
                        machine.
opiInitialise_for_Display
                        Implementation of opiInitialise for the Display
                        machine.
opiInitialise_for_Envision
                        Implementation of opiInitialise for the
                        Envision HMP.
opiInitialise_for_ImoVifa
                        Implementation of opiInitialise for the ImoVifa
                        machine.
opiInitialise_for_KowaAP7000
                        Implementation of opiInitialise for the
                        Octopus900 machine.
opiInitialise_for_MAIA
                        Implementation of opiInitialise for the MAIA
                        machine.
opiInitialise_for_O600
                        Implementation of opiInitialise for the O600
                        machine.
opiInitialise_for_Octopus900
                        Implementation of opiInitialise for the
                        Octopus900 machine.
opiInitialise_for_PhoneHMD
                        Implementation of opiInitialise for the
                        PhoneHMD machine.
opiInitialise_for_PicoVR
                        Implementation of opiInitialise for the PicoVR
                        machine.
opiInitialise_for_SimGaussian
                        opiInitialize_for_SimGaussian
opiInitialise_for_SimHenson
                        opiInitialise_for_SimHenson
opiInitialise_for_SimHensonRT
                        opiInitialise_for_SimHensonRT
opiInitialise_for_SimNo
                        opiInitialise_for_SimNo
opiInitialise_for_SimYes
                        opiInitialise_for_SimYes
opiKineticStimulus      For backwards compatibility. Used by Octopus900
                        and KowaAP7000.
opiPresent              Calls opiPresent_for_MACHINE as appropriate.
opiPresent_for_Compass
                        Implementation of opiPresent for the Compass
                        machine.
opiPresent_for_Display
                        Implementation of opiPresent for the Display
                        machine.
opiPresent_for_Envision
                        Implementation of opiPresent for the Envision
                        HMP.
opiPresent_for_ImoVifa
                        Implementation of opiPresent for the ImoVifa
                        machine.
opiPresent_for_KowaAP7000
                        Implementation of opiPresent for the KowaAP7000
                        machine.
opiPresent_for_MAIA     Implementation of opiPresent for the MAIA
                        machine.
opiPresent_for_O600     Implementation of opiPresent for the O600
                        machine.
opiPresent_for_Octopus900
                        Implementation of opiPresent for the Octopus090
                        machine.
opiPresent_for_PhoneHMD
                        Implementation of opiPresent for the PhoneHMD
                        machine.
opiPresent_for_PicoVR   Implementation of opiPresent for the PicoVR
                        machine.
opiPresent_for_SimGaussian
                        opiPresent_for_SimGaussian
opiPresent_for_SimHenson
                        opiPresent_for_SimHenson
opiPresent_for_SimHensonRT
                        opiPresent_for_SimHensonRT
opiPresent_for_SimNo    opiPresent_for_SimNo
opiPresent_for_SimYes   opiPresent_for_SimYes
opiQueryDevice          Calls opiQueryDevice_for_MACHINE as
                        appropriate.
opiQueryDevice_for_Compass
                        Implementation of opiQueryDevice for the
                        Compass machine.
opiQueryDevice_for_Display
                        Implementation of opiQueryDevice for the
                        Display machine.
opiQueryDevice_for_Envision
                        Implementation of opiQueryDevice for the
                        Envision HMP.
opiQueryDevice_for_ImoVifa
                        Implementation of opiQueryDevice for the
                        ImoVifa machine.
opiQueryDevice_for_KowaAP7000
                        Implementation of opiQueryDevice for the Kowa
                        AP7000 machine.
opiQueryDevice_for_MAIA
                        Implementation of opiQueryDevice for the MAIA
                        machine.
opiQueryDevice_for_O600
                        Implementation of opiQueryDevice for the O600
                        machine.
opiQueryDevice_for_Octopus900
                        Implementation of opiQueryDevice for the
                        Octopus900 machine.
opiQueryDevice_for_PhoneHMD
                        Implementation of opiQueryDevice for the
                        PhoneHMD machine.
opiQueryDevice_for_PicoVR
                        Implementation of opiQueryDevice for the PicoVR
                        machine.
opiQueryDevice_for_SimGaussian
                        opiQueryDevice_for_SimGaussian
opiQueryDevice_for_SimHenson
                        opiQueryDevice_for_SimHenson
opiQueryDevice_for_SimHensonRT
                        opiQueryDevice_for_SimHensonRT
opiQueryDevice_for_SimNo
                        opiQueryDevice_for_SimNo
opiQueryDevice_for_SimYes
                        opiQueryDevice_for_SimYes
opiSetBackground        Deprecated. Use 'opiSetup()'.
opiSetup                Calls opiSetup_for_MACHINE as appropriate.
opiSetup_for_Compass    Implementation of opiSetup for the Compass
                        machine.
opiSetup_for_Display    Implementation of opiSetup for the Display
                        machine.
opiSetup_for_Envision   Implementation of opiSetup for the Envision
                        HMP.
opiSetup_for_ImoVifa    Implementation of opiSetup for the ImoVifa
                        machine.
opiSetup_for_KowaAP7000
                        opiSetBackground
opiSetup_for_MAIA       Implementation of opiSetup for the MAIA
                        machine.
opiSetup_for_O600       opiSetup for the O600 machine.
opiSetup_for_Octopus900
                        Implementation of opiSetup for the Octopus900
                        machine.
opiSetup_for_PhoneHMD   Implementation of opiSetup for the PhoneHMD
                        machine.
opiSetup_for_PicoVR     Implementation of opiSetup for the PicoVR
                        machine.
opiSetup_for_SimGaussian
                        opiSetup_for_SimGaussian
opiSetup_for_SimHenson
                        opiSetup_for_SimHenson
opiSetup_for_SimHensonRT
                        opiSetup_for_SimHensonRT
opiSetup_for_SimNo      opiSetup_for_SimNo
opiSetup_for_SimYes     opiSetup_for_SimYes
opiStaticStimulus       For backwards compatibility. Used by Octopus900
                        and KowaAP7000.
opiTemporalStimulus     For backwards compatibility. Used by Octopus900
                        and KowaAP7000.
pixTodeg                Convert pixels to degrees for machine 'machine'
