Hindawi Publishing Corporation BioMed Research International Volume 2013, Article ID 821428, 5 pages http://dx.doi.org/10.1155/2013/821428 Research Article Normative Findings for Periocular Anthropometric Measurements among Chinese Young Adults in Hong Kong Yasas S. N. Jayaratne, 1 Curtis K. Deutsch, 2,3 and Roger A. Zwahlen 1 1 Discipline of Oral & Maxillofacial Surgery, Faculty of Dentistry, e University of Hong Kong, Hong Kong 2 Eunice Kennedy Shriver Center, University of Massachusetts Medical School, Waltham, MA 02452, USA 3 Harvard Medical School, Boston, MA 02115, USA Correspondence should be addressed to Roger A. Zwahlen; zwahlen@hku.hk Received 19 April 2013; Revised 24 June 2013; Accepted 2 July 2013 Academic Editor: Michael P. Fautsch Copyright © 2013 Yasas S. N. Jayaratne et al. is is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. Measurement of periocular structures is of value in several clinical specialties including ophthalmology, optometry, medical and clinical genetics, oculoplastic surgery, and traumatology. erefore we aimed to determine the periocular anthropometric norms for Chinese young adults using a noninvasive 3D stereophotography system. Craniofacial images using the 3dMDface system were acquired for 103 Chinese subjects (51 males and 52 females) between the ages of 18 and 35 years. Anthropometric landmarks were identified on these digital images according to standard definitions, and linear distances between these landmarks were calculated. It was found that ocular measurements were significantly larger in Chinese males than females for intercanthal width, biocular width, and eye fissure lengths. No gender differences were found in the eye fissure height and the canthal index which ranged between 43 and 44. Both right and leſt eye fissure height-length ratios were significantly larger in females. is is the first study to employ 3D stereophotogrammetry to create a database of anthropometric normative data for periocular measurements. ese data would be useful for clinical interpretation of periocular pathology and serve as reference values when planning aesthetic and posttraumatic surgical interventions. 1. Introduction Measurement of periocular structures is of value in sev- eral clinical specialties including ophthalmology, optome- try, medical and clinical genetics, oculoplastic surgery, and traumatology. e Online Mendelian Inheritance in Man (OMIM) database reveals almost 600 entries in which hyper- telorism or telecanthus is a phenotypic feature [1]. Periocular dysmorphology is a cardinal feature for many genetic and teratogenic syndromes. For example, a shortened palpebral fissure width (i.e., between inner and outer canthi) is typically associated with fetal alcohol embryopathy/syndrome [2]. Periocular abnormalities can also arise through trauma, for example, traumatic telecanthus, which is oſten observed in nasoorbitoethmoid complex fractures. It is important to note that several interacting features such as epicanthic folds, flat nasal bridges, widely spaced eyebrows, or narrow palpebral fissures can give rise to the visual impression of hypertelorism [3, 4]. us accurate clinical measurements are needed for objective evaluation of periocular diseases as well as planning reconstructive surgery. Traditionally anthropometric measurements in the peri- ocular region have been performed using sliding calipers. However, measurements with such sharp instruments near the eye may pose some risk, especially when performing examination on very young or otherwise uncooperative patients. With the advent of commercial, high-resolution 3D stereophotogrammetry over the last decade, it has become possible to readily acquire craniofacial 3D photographs safely and expeditiously, and from these images it has been possible to obtain accurate and reliable measurements [5, 6]. ese digital measurements are well suited to assessment of the periocular region. China has the world’s largest population and residents with Chinese ancestry can be found in many countries.