Comparative analysis of canalicular diameter in opened or closed eyes by ultrasound biomicroscope

Li-Ping Xu, Hao-Jie Liu, Ming Zhou, Jian Shen, Ming
2016 Int Eye Sci   unpublished
誗 AIM: To compare the canalicular diameter when eyes opened and closed using ultrasound biomicroscope. 誗 METHODS: Twenty volunteers (20 eyes) with nasolacrimal duct obstruction were included. The lower canaliculus of one eye in every volunteer was detected and measured with ultrasound biomicroscope when eyes opened and closed. Before measurements sodium hyaluronate was injected through the upper lacrimal puncta until it overflowed from the lower lacrimal puncta. The length of the vertical
more » ... the vertical canaliculus, anteroposterior diameter of the vertical canaliculus at the proximal, middle, distal, anteroposterior diameter and vertical diameter of the horizontal canaliculus at the proximal, middle, distal were measured. According to elliptical area formula S = 仔ab(a = 1 / 2 anteroposterior diameter,b = 1 / 2 vertical diameter) , transverse area of the horizontal canaliculus at the distal, middle and proximal were calculated. The differences of measurement when eyes opened and closed were compared by paired t test. 誗RESULTS:When eyes opened and closed, the length of vertical canaliculus of inferior canaliculus were respectively 2. 56依0. 33 and 2. 76 依 0. 34mm;anteroposterior diameters at the distal part were respectively 0. 29 依 0. 04 and 0. 32 依 0. 04mm;those at the middle were respectively 0. 32依0. 03 and 0. 35 依 0. 04mm;those at the proximal were respectively 0. 38 依 0. 02 and 0. 40 依 0. 04mm and those differences between opened and closed eyes were statistically significant(t =-5. 346,-5. 12,-4. 94,-4. 682;P <0. 05). When eyes opened and closed, the transverse ereas of horizontal part of lower canaliculus at the distal were respectively 0. 88 依 0. 18 and 0. 95 依 0. 15mm 2 ;those at the middle were respectively 0. 67 依 0. 04 and 0. 75 依 0郾 08mm 2 ; those at the proximal were respectively 0. 51 依 0郾 10 and 0. 56 依 0. 15mm 2 and those differences between opened and closed eyes were statistically significant(t =-7. 453,-6. 73,-6. 43;P<0. 05). 誗 CONCLUSION: Compared with the opened eyes, the vertical length of lower canaliculus become shorter, the anteroposterior diameter of vertical canaliculus and transverse areas of horizontal canaliculus become smaller. 誗 KEYWORDS: canaliculus; ultrasound biomicroscope; canalicular diameter;opened eye;closed eye Citation:Xu LP, Liu HJ, Zhou M, et al. Comparative analysis of canalicular diameter in opened or closed eyes by ultrasound biomicroscope. Guoji Yanke Zazhi(Int Eye Sci) 2016;16(4):773-775 摘要 目的:对比闭眼和睁眼时超声生物显微镜检查泪小管管内 径的变化。 方法:选取 2013-12 / 2014-12 在我院眼科诊断为鼻泪管 阻塞的知情同意的患者 20 例 20 眼,经上泪小点打入玻璃 酸钠直到下泪小点返流为止后,下泪小管行 UBM 检查,分 别测量下泪小管相同部位闭眼及睁眼时的垂直部长度;垂 直部近心段、中段、远心段管腔的前后径;水平部远心段、 中段、近心段管腔的前后径和垂直径,根据椭圆面积公式 S = 仔ab(a,b 分别为 1 / 2 前后径和 1 / 2 垂直径) 计算出下 泪小管水平部各段横截面积。 闭眼、睁眼时相同部位泪小 管垂直部长度、各段前后径间的比较以及水平部各段横截 面积间的比较均采用配对 t 检验。
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