Orbital index

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Related to Orbital index: intraoperative, paramedian
(Anat.) in the skull, the ratio of the vertical height to the transverse width of the orbit, which is taken as the standard, equal to 100.

See also: Orbital

Webster's Revised Unabridged Dictionary, published 1913 by G. & C. Merriam Co.
References in periodicals archive ?
c) Orbital index (OI): Orbital width/ Orbital length X 100 Miller et al.
The orbital area, circumference and the orbital index were 12.46 [+ or -] 0.10, 13.29 [+ or -] 0.06 and 107.33 [+ or -] 0.41 cm, respectively.