眼轴长度与眼部生物学参数的关系

Ningxia Medical University Thesis for Applicati on of Master’s Degree
Relation between Axial Length and Ocular Parameters
Student’s Name:Yang Xueqiu
Supervisor: Zhuang Wenjuan
Subject Category:Medicine
Major: Ophthalmology团队氛围
纵目人是什么意思Specialty: Dioptrics of Eye
School:Ningxia Medical University Completion Date:  Mar. 2013
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眼轴长度与眼部生物学参数的关系
摘要
目的探讨眼轴长度(axial length,AL)与屈光状态及眼部生物学参数的关系。
方法对374例(374只右眼)正视及近视受试者用全自动电脑验光仪、A超、角膜厚度测量仪、非接触式眼压计、OrbscanⅡ及3D-OCT分别测量屈光状态、AL、角膜厚度(center corneal thickness,CCT)、眼压(intraocular pressure,IOP)、前房深度(anterior chamber depth,ACD)、白对白距离(white-to-white distance,WWD)、角膜曲率(corneal curvature,CC)及视网膜神经纤维层厚度(retinal nerve fibre layer thickness,RNFLT),利用Shapiro-Wilk检验(W检验)对AL进行正态性检验,用Spearman相关系数及多元线性回归方法评估AL与年龄及眼部生物学参数的关系;同时又在374例研究对象中随机抽取22mm≤AL<24mm对象69例,24mm≤AL<26mm对象69例,AL≥26mm对象共69例,分别命名为1、2、3组,对3个组间各眼部参数进行单因素方差分析及最小显著法(Least-significant difference, LSD)检验,进一步研究AL与屈光状态及眼部生物学参数的关系。
结果374例研究对象中,AL均值为24.49±1.49mm,Shapiro-Wilk检验示AL呈非正态分布(P<0.001),Spearman 相关性分析显示AL与等值球镜度数(spherical equivalent,SE)(r=-0.712,P<0.001)、CC(r=-0.351,P<0.001)及RNFLT(r=-0.385,P<0.001)成负相关,与ACD(r=0.361,P<0.001)呈正相关关系,而与CCT(r =0.016,P=0.760)及WWD(r=0.099,P=0.055)无相关性;多元线性回归分析显示AL与SE(t=-26.240,P<0.001)、CC(t=-15.757,P<0.001)、RNFLT(t=-2.118,P=0.035)及ACD(t=5.927,P<0.001)均表现出明显相关性。按A
L分1、2、3组,三组间行单因素方差分析结果显示:除CCT (F=0.333,P=0.717)、WWD(F=2.341,P=0.099)两项参数在三组间比较无统计学差异外,SE(F=202.000,P<0.001)、ACD(F=17.077,P<0.001)、CC(F=9.338,P<0.001)、RNFLT(F=21.729,P<0.001)在三组间表现出明显统计学差异。对三组间的SE、ACD、
CC及RNFLT进一步行LSD检验得出:1、2两组间随AL延长,SE(d=3.184,P<0.001),CC(d=0.967,P<0.001),RNFLT(d=5.972,P<0.001)相应降低,ACD(d= -0.245,P<0.001)随之加深;2、3两组间随眼轴延长,SE(d=4.069,P<0.001)及RNFLT(d=3.652,P=0.014)相应降低,而ACD(d=-0.009,P=0.858)、CC(d= -0.250,P=0.283)变化无统计学意义;
1、3两组间随AL延长,SE(d=7.254,P<0.001),CC(d=0.717,P=0.002),RNFLT(d=9.624,P<0.001)降低,ACD(d= -0.254,P<0.001)加深。
结论AL<26mm范围内,眼轴越长,屈光度越高,角膜越扁平,前房越深,RNFLT 越薄;但当AL≥26mm后,即使AL发生进一步延长,除SE及RNFLT随之降低外,余眼部生物学参数趋于稳定状态,基本不再发生进一步的变化。
关键词眼轴长度;眼部生物学参数;屈光度
Relation between Axial Length and Ocular Parameters
ABSTRACT
小额贷款公司改制设立村镇银行暂行规定Objective To investigate the relation between axial length and ocular parameters.
Methods A total of 374 patients (374 right eyes) with emmetropia or myopia were recruited. Refraction, center corneal thickness (CCT), axial length (AL), intraocular pressure (IOP), corneal curvature (CC) and anterior chamber depth (ACD), retinal nerve fibre layer thickness (RNFLT) were measured by CANON RK-F1 automatic-refractor, Pachymeter SP 3000, A-mode ultrasound (OPTIKON 2000), CANON TX-F non-contact tonometer, Orbscan II (BAUSCH &LOMB), Three dimensional frequency domain coherent optical tomography (TOPCON 3D-OCT), respectively. Shapiro-Wilk test (W test) was used to analyze AL normal distribution. The Spearman correlation coefficient (r) and multiple regression analysis were applied to evaluate the relationship between axial length and ocular parameters. Then, 69 subjects with an axial length ranging from 22 millimeters(mm)to 24 mm, 69 subjects with an AL from 24 mm to 26 mm and 69 subjects with an AL greater than 26 mm were selected randomly. They were named group 1, 2, 3, separately. The ocular parameters among the three groups were tested by one-way ANOV A and the Least-significant difference (LSD) methods.
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Results The average AL was 24.49±1.49mm. The AL values showed non-normal distribution in Shapiro-Wilk test (P <0.001). Then the Spearman correlation analysis was used to do the further test. We found that with elongation of the AL, Spherical equivalent (SE) (r=-0.712,P<0.001), CC (r=-0.351,P<0.001) and RNFLT (r=-0.385,P<0.001) all decreased, while the mean ACD (r=0.361,P<0.001) increased. Multiple regression analysis showed that the AL and SE (t=-26.240,P<0.001), CC (t=-15.757,P<0.001), ACD (t=5.927,P<0.001), RNFLT (t=-2.118,P=0.035) has significance correlation. Further more the one-way ANOV A was used among the three groups we have classified. CCT (F=0.333,P=0.717), WWD

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