Is the rightEyeTransform rotation matrix in degrees or radians or neither

When presuming its radians and converting it to degrees, the results seem semi-accurate, however looking around with my eyes I horizontally can move no more than 30 degrees. This seems correct and not correct at the same time . Is it fair to assume I can convert righteyetransform.columns.2.x to degrees from presumably radians to get an accurate result?

Is the rightEyeTransform rotation matrix in degrees or radians or neither
 
 
Q