{Reference Type}: Journal Article
{Title}: Assessment of Normal Eyeball Protrusion Using Computed Tomographic Imaging and Three-Dimensional Reconstruction in Korean Adults.
{Author}: Shin KJ;Gil YC;Lee SH;Kim JN;Yoo JY;Kim SH;Choi HG;Shin HJ;Koh KS;Song WC;
{Journal}: Semin Ophthalmol
{Volume}: 32
{Issue}: 5
{Year}: 2017
{Factor}: 2.246
{DOI}: 10.3109/08820538.2015.1131837
{Abstract}: <B>OBJECTIVE: </B>The aim of the present study was to assess normal eyeball protrusion from the orbital rim using two- and three-dimensional images and demonstrate the better suitability of CT images for assessment of exophthalmos.<BR><B>METHODS: </B>The facial computed tomographic (CT) images of Korean adults were acquired in sagittal and transverse views. The CT images were used in reconstructing three-dimensional volume of faces using computer software. The protrusion distances from orbital rims and the diameters of eyeballs were measured in the two views of the CT image and three-dimensional volume of the face. Relative exophthalmometry was calculated by the difference in protrusion distance between the right and left sides.<BR><B>RESULTS: </B>The eyeball protrusion was 4.9 and 12.5 mm in sagittal and transverse views, respectively. The protrusion distances were 2.9 mm in the three-dimensional volume of face. There were no significant differences between right and left sides in the degree of protrusion, and the difference was within 2 mm in more than 90% of the subjects.<BR><B>CONCLUSIONS: </B>The results of the present study will provide reliable criteria for precise diagnosis and postoperative monitoring using CT imaging of diseases such as thyroid-associated ophthalmopathy and orbital tumors.