Nakamura Jutaro, Kamao Tomoyuki, Mitani Arisa, Mizuki Nobuhisa, Shiraishi Atsushi
Department of Ophthalmology, Ehime University Graduate School of Medicine, Toon, Ehime, 791-0295, Japan.
Department of Ophthalmology and Visual Science, Yokohama City University Graduate School of Medicine, Yokohama, Kanagawa, 236-0004, Japan.
Clin Ophthalmol. 2022 Jun 23;16:2057-2067. doi: 10.2147/OPTH.S370800. eCollection 2022.
The dacryoendoscope is a practical instrument for the examination and the treatment of lacrimal duct obstruction. Nevertheless, as it is a rigid fiberscope, manipulation of the endoscope is somewhat affected by the patient's lacrimal duct alignment and the skeletal structure of the face. The morphology and inclination of the lacrimal duct vary among individuals and ethnic groups. We aimed to evaluate the alignment of the lacrimal duct from the perspective of endoscopic maneuverability in a Japanese population.
This retrospective study analyzed the cone-beam computed tomography dacryocystography (CBCT-DCG) images of 102 patients diagnosed with unilateral primary acquired nasolacrimal duct obstruction (PANDO) at Ehime University Hospital from December 2015 to May 2021. The following parameters of the lacrimal duct on the contralateral side of unilateral PANDO were investigated: (1) angle formed by the superior orbital rim-internal common punctum-nasolacrimal duct opening, (2) angle formed by the lacrimal sac and the nasolacrimal duct, (3) length of the lacrimal sac, and (4) length of the nasolacrimal duct.
Measurements of the above parameters were (1) 10.2° ± 7.8° (range, -11° to +27°), (2) -6.3° ± 14.1° (range, -43° to +40°), (3) 8.9 ± 2.3 mm (range, 4.3-17.1), and (4) 13.2 ± 2.7 mm (range, 5.7-20.7), respectively. The Shapiro-Wilk test demonstrated that the values of all parameters, except (3), followed a normal distribution ( = 0.55, 0.30, 0.0002, and 0.39, respectively). No significant difference was found between the female and male groups ( > 0.05).
This study reported anthropometric analysis data of the morphology of the lacrimal ducts using CBCT-DCG in a Japanese population. In our cohort, the line from the superior orbital rim through the internal common punctum to the nasolacrimal duct opening inclined anteriorly in 92% of the patients.
泪道内窥镜是用于检查和治疗泪道阻塞的实用器械。然而，由于它是一种硬质纤维内窥镜，内窥镜的操作在一定程度上会受到患者泪道走行和面部骨骼结构的影响。泪道的形态和倾斜度在个体和种族群体之间存在差异。我们旨在从内窥镜可操作性的角度评估日本人群中泪道的走行。
这项回顾性研究分析了2015年12月至2021年5月在爱媛大学医院被诊断为单侧原发性后天性鼻泪管阻塞（PANDO）的102例患者的锥束计算机断层扫描泪囊造影（CBCT-DCG）图像。研究了单侧PANDO对侧泪道的以下参数：（1）眶上缘-内眦泪点-鼻泪管开口形成的角度，（2）泪囊与鼻泪管形成的角度，（3）泪囊长度，以及（4）鼻泪管长度。
上述参数的测量值分别为：（1）10.2°±7.8°（范围，-11°至+27°），（2）-6.3°±14.1°（范围，-43°至+40°），（3）8.9±2.3mm（范围，4.3 - 17.1），以及（4）13.2±2.7mm（范围，5.7 - 20.7）。Shapiro-Wilk检验表明，除（3）外，所有参数的值均呈正态分布（分别为=0.55、0.30、0.0002和0.39）。女性组和男性组之间未发现显著差异（>0.05）。
本研究报告了在日本人群中使用CBCT-DCG对泪道形态进行人体测量分析的数据。在我们的队列中，92%的患者眶上缘经内眦泪点至鼻泪管开口的连线向前倾斜。
