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目的通过磁共振成像(MRI)三维重建并测量近视眼眼球容积,分析其与眼轴的关系,为玻璃体手术中估算填充物的填充量提供依据。设计前瞻性病例系列。研究对象35例单眼视网膜脱离患者的对侧健眼。方法行眼前节、眼底及眼部超声检查,显然验光及MRI三维重建测量眼球容积。根据屈光度数及眼底有无病理性改变,将患者分为病理性近视组(A组)和非病理性近视组(B组)。比较两组各参数的差异及眼球容积与各参数的关系。主要指标MRI测量的眼球容积、A超眼轴、屈光度,最佳矫正视力。结果 A组平均眼球容积为(9026.00±1565.94)mm3,B组(6449.99±696.43)mm(3z=-4.767,P=0.000)。A组5眼眼球规则均匀增大,12眼增大以前后径为主,3眼伴颞侧变形。B组眼球形态正常。两组最佳矫正视力分别为:A组(0.63±0.37)、B组(1.07±2.84)(z=-3.209,P=0.001);A超眼轴分别为:A组(29.15±2.76)mm、B组(23.80±1.14)mm(z=-5.000,P=0.000)。A组眼球容积与眼轴相关性最大(r=0.86,P=0.000),与屈光度(r=0.539,P=0.021)相关,与最佳矫正视力(r=-0.510,P=0.031)负相关。B组眼球容积与眼轴相关(r=0.76,P=0.000),与屈光度(r=0.535,P=0.060)和最佳矫正视力(r=-0.062,P=0.841)不相关。A组眼球容积与眼轴的一元线性回归方程为:眼球容积=499.75×眼轴-5544.87;B组眼球容积与眼轴的一元线性回归方程为:眼球容积=440.678×眼轴-4040.2。结论 MRI可较好地应用于近视眼活体眼球容积的测量,病理性近视眼球容积与眼轴显著相关并呈线性关系,本研究提出的回归方程为玻璃体手术中估算填充量提供数据参考。
Objective To reconstruct and measure myopic eyeball volume by magnetic resonance imaging (MRI) and analyze its relationship with axial length to provide basis for estimating the filling amount of filler in vitreous surgery. Design prospective case series. 35 cases of unilateral retinal detachment in patients with contralateral health eye. Methods line anterior segment, fundus and ocular ultrasound examination, apparently optometry and MRI three-dimensional reconstruction of the eyeball volume measurement. Patients were divided into pathological myopia group (group A) and non-pathological myopia group (group B) according to the diopter number and the presence or absence of pathological changes in the fundus. The differences between the two groups of parameters and the relationship between eyeball volume and parameters were compared. The main indicators MRI measurement of the eyeball volume, A super-axial, refractive, best corrected visual acuity. Results The average eyeball volume in group A was (9026.00 ± 1565.94) mm3, in group B (6449.99 ± 696.43) mm (3z = -4.767, P = 0.000). A group of 5 eyes uniformly enlarged rules, 12 eyes increased before and after the main diameter, 3 eyes with temporal deformation. Group B eye morphology is normal. The best corrected visual acuity in the two groups were as follows: group A (0.63 ± 0.37), group B (1.07 ± 2.84) (z = -3.209, P = 0.001) , Group B (23.80 ± 1.14) mm (z = -5.000, P = 0.000). The eyeball volume in group A had the highest correlation with axial length (r = 0.86, P = 0.000), and was negatively correlated with the best corrected visual acuity (r = -0.510, P = 0.031) . Eye volume in group B was correlated with axial length (r = 0.76, P = 0.000) and was not related to diopter (r = 0.535, P = 0.060) and best corrected visual acuity (r = -0.062, P = 0.841). The linear regression equation of eyeball volume and axial length in group A was: eyeball volume = 499.75 × axis -5544.87; the linear regression equation of eyeball volume and eye axis in group B was: eyeball volume = 440.678 × axis-4040.2. Conclusions MRI can be applied to the measurement of living eyeball volume in myopia. There is a linear correlation between the volume of eyeball and pathological myopia. The regression equation proposed in this study provides a reference for estimating the filling volume in vitreous surgery.