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目的通过磁共振成像(MRI)方法测量高度近视眼和正视眼的球内空间参数,了解高度近视眼球形态学改变特征,探讨眼球扩张模式。设计病例对照研究。研究对象32例正视者(60眼)和33例高度近视者(60眼),未发现眼部器质性疾病及外伤手术史。方法高度近视和正视眼各60眼,采用MRI(1.5T,PHILLIS)测量眼球前后径、水平径、垂直径、眼球内容积、球内各部分容积。主要指标眼球各径线值和各部分容积。结果高度近视眼的前后径(28.16±2.80 mm)、水平径(22.87±1.23 mm)、垂直径(23.40±0.99mm)均较正视眼明显增大(P均=0.000),其中前后径变化最大(5.38 mm);眼球内前后径与屈光度呈高度正相关.(0 36mm/D,r~2=0.88,P=0.000);高度近视眼球内容积(7.46±0.89)ml、玻璃体腔容积(6.90±0.80)ml,较正视眼明显增大(P均= 0.000);眼前节容积和晶状体容积保持相对稳定(P=0.220,P=0.630)。结论高度近视眼球径线较正视眼均增大;高度近视眼玻璃体腔容积的增加导致了眼球总容积的增加;高度近视眼球扩张可能存在球形和轴性扩张两种模式,屈光度越高,轴性扩张越明显。
Objective To measure the intracapsular spatial parameters of high myopia and eyelid by magnetic resonance imaging (MRI), and to understand the morphological changes of high myopia and to explore the pattern of eyeball dilatation. Design a case-control study. In the study, 32 cases of front viewers (60 eyes) and 33 cases of high myopia (60 eyes) did not find the eye organic diseases and traumatic surgery history. Methods High myopia and emmetropia were observed in 60 eyes. MRI (1.5T, PHILLIS) was used to measure the anteroposterior diameter, horizontal diameter, vertical diameter, intraocular volume and intraocular volume. Main indicators Eye diameter and the various parts of the volume. Results The anteroposterior diameter (28.16 ± 2.80 mm), horizontal diameter (22.87 ± 1.23 mm) and vertical diameter (23.40 ± 0.99 mm) of the highly myopic eyes were significantly higher than those of the normal eyes (P = 0.000) (5.38 mm). The anterior-posterior diameter of the eyeball was highly positively correlated with the refraction (0 36 mm / D, r 2 = 0.88, P 0.000). The intraocular volume of the high myopia (7.46 ± 0.89) ml and the volume of the vitreous cavity ± 0.80) ml, which was significantly higher than that of the normal eyes (P = 0.000). The anterior segment volume and lens volume remained relatively stable (P = 0.220, P = 0.630). Conclusions The spherical diameter of high myopia is larger than that of the normal eye. The increase of the volume of the vitreous cavity in high myopia leads to the increase of the total volume of the eyeball. There are two modes of spherical and axial dilatation in the high myopia. The higher the diopter, The more obvious expansion.