angle kappa

The angle between the pupillary axis, which passes through the center of the entrance pupil and is perpendicular to the cornea, and the visual axis, which connects the fixation point with the fovea. A positive angle kappa occurs when the pupillary axis is nasal to the visual axis, which is the typical configuration. Angle kappa is often confused with angle lambda, which is the angle between the pupillary axis and line of sight.