Driessen Juliette P, Vuyk Hadé, Borgstein Johannes
Department of Otolaryngology, Head and Neck surgery, Sophia Children's Hospital, Erasmus University Rotterdam, The Netherlands.
Int J Pediatr Otorhinolaryngol. 2011 Apr;75(4):579-84. doi: 10.1016/j.ijporl.2011.01.023. Epub 2011 Feb 16.
In facial and reconstructive surgery objective assessment of anatomy is crucial to evaluate surgical results. Photographic computer-assisted anthropometry substitutes clinical measurements. The constancy of the horizontal iris diameter (IDh) allows iris dependent calibration of photographs, replacing the need for a scale.
We performed a prospective cohort study to assess the constancy of the IDh in children. Frontal and close-up digital photographs of the eyes were taken of 100 children aged 5-18 years. The IDh was measured twice; once with a scale positioned on the forehead (IDh*(forehead)) and once with a scale positioned next to the tragus (IDh*(ear)).
Our data confirms the constancy of the IDh in children from the age of 5, with a mean IDh*(forehead) of 11.22 ± 0.52 mm. We found no difference between gender and no variation with age. For structures that are not in the same coronal plane as the iris, an adjusted iris diameter is needed to compensate for the difference in distance from the camera.
We confirm the reliability of iris dependent calibration in frontal photographs from the age of 5. This technique allows evaluation of a wide variety of pre-existing photographs that do not have a scale included, simplifies photographic conditions and facilitates long-term follow-up.
在面部整形手术中，解剖结构的客观评估对于评估手术效果至关重要。计算机辅助摄影人体测量学可替代临床测量。水平虹膜直径（IDh）的稳定性使得可以根据虹膜对照片进行校准，从而无需使用比例尺。
我们进行了一项前瞻性队列研究，以评估儿童IDh的稳定性。对100名5至18岁儿童的眼睛进行了正面和特写数码拍照。IDh测量了两次；一次是将比例尺置于前额（IDh*(前额)），另一次是将比例尺置于耳屏旁（IDh*(耳部)）。
我们的数据证实了5岁及以上儿童IDh的稳定性，IDh*(前额)的平均值为11.22±0.52毫米。我们发现性别之间没有差异，且不随年龄变化。对于与虹膜不在同一冠状平面的结构，需要调整虹膜直径以补偿与相机距离的差异。
我们证实了5岁及以上儿童正面照片中基于虹膜校准的可靠性。该技术可对大量未包含比例尺的现有照片进行评估，简化了拍照条件并便于长期随访。
