Blind spot and False positive stimulus

Open Perimetry Interface
#1

How to set, present locations and get responses for blind spot and false positive

#2

Hi Pinaz.

You have to do these things manually yourself, and so it is with calls to opiPresent.

For example, to do a blindspot check (left eye, 10dB)

   s <- list(x=-15, y=-2, size=3, level=dbTocd(10, 10000/pi), color="white", duration=200, responseWindow=1500)
   class(s) <- "opiStaticStimulus"
   opiPresent(s)

And for a false positive, you can just present a really dim stimulus like this:

   s <- list(x=10, y=10, size=3, level=dbTocd(50, 10000/pi), color="white", duration=200, responseWindow=1500)
   class(s) <- "opiStaticStimulus"
   opiPresent(s)

Or you can just present nothing in a sneaky way using nextStim, but that gets more complicated.