目的：：探讨利用偏振效应构建的3种不同注视方式下双眼调节反应的差异。方法：前瞻性对照研究。选取15名正视眼志愿者入选本试验(年龄18~38岁，男6名，女9名)。利用偏光镜和液晶显示器的偏振特性，设置3种不同的注视方式：(1)右眼能看到屏幕显示的视标，左眼无法看到；(2)右眼无法看到屏幕视标，左眼能看到；(3)双眼均能看到屏幕视标。使用红外电脑验光仪分别测量注视距离为5、2、1、0.5、0.33m时的客观验光值(以等效球镜计算)，计算所有受试者在以上3种注视方式下的调节反应量。采用重复测量的方差分析和t检验比较不同注视方式下双眼调节反应的差异。结果：采用注视方式(1)(2)时，双眼在各种调节刺激下产生的调节反应有明显差异，其中使用眼(能看到屏幕视标眼)的调节反应均比未使用眼(不能看到屏幕视标眼)大(P0.05)。结论：双眼开放状态下，经常被使用眼的睫状肌处于相对紧张状态，较少使用眼则处于相对放松状态。这种调节反应的不均衡性，很可能是促发近视发生的危险因素。%AlM: To study the differences of accommodative responses between the two eyes under 3 different polarized viewing conditions.METHODS:Fifteen volunteers with emmetrope were recruited into this study ( aged 18 ~ 38 ) , 6 males and 9 females. Three different viewing conditions were set up by using polarizing glasses and liquid crystal display:(1) right eye could see the visual target on the screen, but left eye cannot see it;( 2 ) left eye could see the visual target on the screen, but right eye cannot see it;(3)both eyes could see the target. Accommodative responses were measured by infrared auto-refractor when fixating at the target at 5, 2, 1, 0. 5 and 0. 33m under the above 3 viewing conditions. The differences of accommodative responses under different viewing conditions were compared by using variance analysis of repeated measuring and t test.RESULTS:Significant differences of accommodative responses between the two eyes were found under condition ( 1 ) and ( 2 ) at all the fixating distance. The accommodative responses in used eyes which can see the visual target were higher than in non-used eyes which cannot see the visual target ( P 0. 05).CONCLUSlON:Ciliary muscles in the used eyes were more relatively tonic than non - used eyes under binocular open viewing condition. The imbalance of accommodative responses between two eyes may be one of the risk factors resulting into the occurrence of myopia.
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