The binocular distance (BOD) is a measurement between the two lateral (outer) canthi of each eye. It is sometimes used as a accessory fetal biometric parameter where it is often documented on both 2nd trimester anatomy scans on axial brain scans. The largest diameter of the orbit should be used and it is considered useful from 7 weeks through to term 1. There can be some difference between ethnic groups 2.
It is increased with hypertelorism and reduced with hypotelorism.
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