caltheta {binovisualfields} | R Documentation |
caltheta
calculates the angle of convergence (radians) for left or right eye to fixate at a designated fixation distance.
caltheta(fixdist, pd = NULL, gender = NULL, eye = c("left", "right"))
fixdist |
A two element vector of fixation distance in mm in Cartesian coordinates. |
pd |
A number of pupil distance in mm. |
gender |
A string of either "male" or "female" |
eye |
A string specifying either "left" or "right" eye. |
The angle of convergence in radians that respective eye with a pupil distance of pd
rolls to fixate at fixation distance of fixdist
.
the value of either pd or gender has to be provided the unit of pd and fixdist must be the same and is default to mm.
caltheta(c(600, 0), pd=65, eye="left")
caltheta(c(600, 0), gender="male", eye="left")