- Author: Barbara L Roque, MD, DPBO, FPAO; Chief Editor: Hampton Roy, Sr, MD more...
Pseudoexotropia is a condition in which the alignment of the eyes is straight (also known as orthotropic); however, they appear to be turned outward.
Pseudoexotropia occurs with a wide interpupillary distance or a positive angle kappa. Angle kappa is the angle formed between 2 imaginary lines: the visual axis and the pupillary axis. To construct the visual axis, extend a straight line from the viewing object through the nodal point. A straight line going through the center of the pupil and perpendicular to the corneal plane constructs the pupillary axis. Since fovea is displaced temporally, a small angle kappa (up to 5°) manifests as a nasally displaced corneal light reflex. Children may falsely appear to have an exotropia when they look to the side.