AlM: To examine the retinal nerve fiber layer ( RNFL ) changes in early primary open angle glaucoma ( POAG ) by comparing the superior half of the optic disc with the inferior disc half.METHODS: lt was a clinical observational study. The study included 30 patients ( 39 eyes ) with POAG and 20 normal subjects ( 40 eyes ) . Visual field was tested by Zeiss Humphrey750 and the optic disc topographic parameters and RNFL thickness were measured by Zeiss Cirru HD-OCT. Collecting information included visual field mean defect ( MD ) , glaucoma hemifield test ( GHT ) , intraocular pressure ( lOP ) , C/D ratio and RNFL thickness. Data were analyzed by statistic software SPSS18. 0. The differences between two groups were assessed using t test.RESULTS: The differences of superior RNFL minus inferior RNFL thichness on the corresponding clock-hour locations were caculated in two groups. There was a significant difference in superonasal- inferonasal RNFL thickness between two groups (t=2. 526, P=0. 014), and there were no significant differences in the others ( all P>0. 05).CONCLUSlON: The asymmetry of optic disc hemifield RNFL is found in early primary open angle glaucoma patients. The superonasal RNFL ( 1 o’clock for right eye, and 11 o’clock for left eye ) is more fragile to loss than inferonasal RNFL (5 o’clock for right eye, and 7 o’clock for left eye) .%目的：：探讨原发性开角型青光眼( primary open angle glaucoma, POAG)早期上下半视盘周围视网膜神经纤维层( retinal nerve fiber layer, RNFL)的变化特征。方法：临床观察研究,研究对象为2012-05/2014-05在我院门诊确诊为原发性开角型青光眼早期患者30例39眼和健康成人20例40眼,使用Humphrey视野计和光学相干断层成像术( optical coherence tomography,OCT)检查,分别记录视野平均缺损( mean defect,MD)、青光眼半视野检测( glaucoma hemifield test, GHT)、眼压、C/D比值及视盘周围FNFL厚度。使用SPSS 18.0统计软件对测量值进行统计分析,计量资料组间比较采用t检验。结果：两组上半视盘各钟点位的RNFL厚度减去下半视盘相对应钟点位的RNFL厚度,两组间比较,仅上鼻-下鼻的差值具有统计学意义(t=2.526,P=0.014),其余上下半视盘相对应钟点位RNFL厚度的差值比较,两组间均无统计学意义(均为P>0.05)。结论：原发性开角型青光眼早期上下半视盘周围RNFL存在不对称性变化,上鼻部位(右眼1：00位,左眼11：00位)的RNFL较下鼻部位(右眼5：00位,左眼7：00位)的RNFL更容易受损变薄。
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