Interocular distance

Radswiki et al.

The interocular distance (IOD) is a measurement between the two medial canthi of each eye. It is often measured as an accessory biometric parameter on routine antenatal ultrasound scans on the axial images. As a rule of thumb, the interorbital distance should be roughly equal to the ocular diameter - however specific  biometric charts are available.

Increased interocular distance is referred to as hypertelorism and decreased distance as hypotelorism.

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Article information

rID: 15280
System: Obstetrics
Tags: stub, cases
Synonyms or Alternate Spellings:
  • Inter-ocular distance (IOD)
  • Inter ocular distance
  • Interocular distance / diameter (IOD)
  • Interocular distance
  • Interocular diameter
  • Inter-ocular diameter
  • Interorbital distance

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