近视眼角膜Q值相关因素与双眼对称性研究

Related factors and symmetry between right and left eyes of corneal Q-value in myopic eyes

目的研究近视眼角膜Q值的分布特征及其相关因素,并分析Q值在同一个体双眼之间的对称性。方法使用OrbscanIIz眼前节分析系统K&Q计算软件获得305例610眼近视患者角膜6mm分析区域的Q值,并针对Q值的分布及与其相关的屈光度、角膜曲率和晶状体厚度等因素进行统计学分析。结果305例610眼角膜Q值呈正态分布,平均-0.16±0.11(-0.51～0.20)。Q值与角膜散光、角膜曲率、晶状体厚度和Zernik系数Z40之间呈线性相关,而与球镜、等效球镜度、角膜前后表面Diff值、3mm和5mm区不规则指数、模拟角膜镜读数、角膜直径、角膜厚度、眼压、前房深度、眼轴长度、性别、年龄之间不相关,且同一个体双眼Q值差异无统计学意义。结论角膜Q值个体间差异较大,与眼部多个因素相关,且同一个体双眼对称性良好。

Objective To investigate the distribution characters and related factors of corneal Q-value in myopic eyes, and analyze the symmetry of Q-value between right and left eyes. Methods The K＆Q calculator of Orbscan Ilz anterior segment system was used to obtain the Q-value of 6 mm optical zone in 305 cases （610 eyes）, and statistical analysis was used to comprehend the distribution characters of Q-value and its relations with diopter, cornea curvature and lens thickness. Results The Q-value of 610 eyes （305 cases） were positive normal distribution with average as -0.16±0.11（from -0.51 to 0.20）. The Q-value showed line relates with cornea astigmatism, cornea curvature,lens thickness and Z4°,but no relates with spherical lens, spherical equivalent, Diffvalue of anterior and posterior surface, irregular index of 3 mm and 5 nun zone, simulated keratometry, cornea diameter, cornea thickness, intraocalar pressure, anterior chamber depth, axis ocular length, sex and age. There was no significant difference between right and left eyes individually. Conclusion The cornea Q-value shows a significant individual variation, and it has relations with many factors of eye. Both eyes exhibite marked symmetry in individual.