There are multiple definitions:

1. ischemic optic neuropathy(English)

   • AAION, AION, PION
   • Neuropathy, Ophthalmology

2. inferior olivary nucleus(English)

   • is located adjacent to the pyramid in the caudal hindbrain. It comprises three major nuclei; the principal nucleus, the dorsal nucleus, and the medial nucleus. The caudal part of the medial nucleus is further divided into a number of subnuclei
   • Anatomy, Brain (dys)function
   • https://doi.org…69497-3.10011-1

3. infraorbital nerve(English)

   • HRCT, IOF, ITF, MRI, PMF, PPF
   • Ophthalmology, Neurology
   • https://doi.org…3244-016-0498-1