pupillary axis

pu·pil·lar·y ax·is

a line perpendicular to the surface of the cornea, passing through the center of the pupil; the "direction of gaze."
References in periodicals archive ?
An analysis of 132 images indicated that many people wear the device near or overlapping their pupillary axis (a line perpendicular to the surface of the cornea, passing through the center of the pupil), which may induce scotomas and interfere with daily function.