Rotation of the upper pole of each cornea outwards.
[ex- + cyclo- + L. vergo, to bend, incline]
Farlex Partner Medical Dictionary © Farlex 2012
Rotary movements about their respective anteroposterior axes of one eye relative to the other. If the upper pole of the cornea of one eye moves away from that of the other eye, it is called excyclovergence. If, however, the upper pole of the cornea of one eye moves towards that of the other eye, it is called incyclovergence.
Millodot: Dictionary of Optometry and Visual Science, 7th edition. © 2009 Butterworth-Heinemann