Background Optic neuritis is one of the common clinical neuro-ophthalmic diseases.Spectraldomain OCT (SD-OCT) is a valuable tool in assessing the thickness changes of retina,while enhanced depth imaging (EDI) OCT can further quantitatively and morphologically evaluate the changes of retina and choroid.The pathological mechanism of optic neuritis is unclear now.Objective This study was to quantitatively measure the retinal and choroidal thickness in early optic neuritis eyes by SD-OCT and EDI OCT.Methods A prospective cohort study was carried out in Tianjin Eye Hospital from July 2015 to May 2016.Twenty eyes of 20 patients with acute optic neuritis were enrolled as optic neuritis group and 22 eyes of 20 healthy subjects with matched age and gender were included in the normal control group.The mean thickness of retinal nerve fiber layer (RNFL) and choriod in superior,inferior,nasal and temporal quadrants at 3.4 mm around optic disc was measured,and the mean thickness of RNFL,ganglion cell layer (GCL),inner plexiform layer (IPL),inner nuclear layer (INL),outer plexiform layer (OPL),outer nuclear layer (ONL) and photoreceptor layer also was measured by EDI OCT.Pattern visual evoked potential (P-VEP) and visual field were examined in all the individuals,the correlations of mean defect (MD) with the thickness of RNFL,choroid and the thickness of RNFL,GCL,IPL,INL,OPL,ONL,photoreceptor layer at macular area were evaluated.Results The RNFL thickness values were (424.00±160.30),(428.40±169.83) and (108.15 ±50.66) μm in superior,inferior,nasal quadrants at 3.4 mm arear around optic disc in the optic neuritis group,which were significantly higher than (265.68±26.25),(283.27±52.81) and (72.68± 12.01) μm in the normal control group (t=4.571,3.814,3.190,all at P＜0.01),and there was no significant difference between the two groups (t =0.849,P =0.401),and no significant differences were found in choroidal thickness of 4 quadrants between the two groups (all at P＞0.05).The thickness of RNFL,GCL and IPL at 1 mm area around macula and the thickness of GCL,IPL,INL at 3 mm area around macula were evidently thining in the optic neuritis group compared with the normal control group (all at P＜0.05).The latency of P100 wave was (133.15±11.11) seconds in the optic neuritis group and that in the control group was (94.59 ±4.38) seconds,showing a significnat difference between them (t =15.058,P＜0.05).Positive correlations were found between MD and the RNFL thickess in superior,inferior,nasal quadrants at 3.4 mm arear around optic disc (r =0.649,0.649,0.635,all at P＜0.05),however,no evidentlylinear correlations were found between MD and choroidal thickness in 4 quadrands (r =-0.120,-0.102,-0.415,0.120,all at P＞0.05),and the thickness of RNFL,GCL,IPL,INL,OPL,ONL,photoreceptor layer at macular area was significantly linear correlated with MD.Conclusions EDI OCT can reflect the RNFL edema around optic disc and thining of various layers of retina at macular area in acuter optic neuritis eyes,however,the choroidal thickess is unchanged.EDI OCT is a useful tool in quantitative evaluation of retinal and choroidal thickness of early optic neuritis.%背景 视神经炎是常见的神经眼科疾病之一.频域OCT(SD-OCT)是客观评价视网膜厚度变化的有用工具,而增强深度成像(EDI)OCT则可进一步对视网膜和脉络膜的形态进行定量评估.目前关于视神经炎的早期视网膜和脉络膜形态变化尚未阐明. 目的 采用SD-OCT和EDI OCT对视神经炎早期的视网膜和脉络膜形态进行定量检测,了解视神经炎早期的视网膜和脉络膜变化特征. 方法 采用前瞻性队列研究方法,于2015年7月至2016年5月纳入天津市眼科医院确诊的急性发作期视神经炎患者20例20眼,同期纳入性别和年龄匹配的健康体检者22人22眼.采用SD-OCT及EDI OCT测量受检者视盘周围3.4mm区域上、下、鼻、颞侧4个象限的视网膜神经纤维层(RNFL)平均厚度及上、下、鼻、颞侧4个象限的脉络膜厚度以及黄斑区RNFL、神经节细胞层(GCL)、内丛状层(IPL)、内核层(INL)、外丛状层(OPL)、外核层(ONL)、光感受器层的平均厚度.所有受检者均行图形视觉诱发电位(P-VEP)及视野检查,评价视野平均缺损(MD)与视盘周围RNFL平均厚度、脉络膜厚度、黄斑区RNFL、GCL、IPL、INL、OPL、ONL、光感受器层厚度的相关性. 结果 视神经炎患者视盘周围3.4 mim区域上方、下方及鼻侧3个象限的RNFL厚度分别为(424.00±160.30)、(428.40±169.83)和(108.15±50.66) μm,较正常对照组的(265.68±26.25)、(283.27±52.81)和(72.68±12.01) μm均明显增加,差异均有统计学意义(t=4.571、3.814、3.190,均P＜0.01),2个组间颞侧象限的RNFL厚度差异无统计学意义(t=0.849,P=0.401);2个组间上方、下方、鼻侧、颞侧4个象限的脉络膜厚度的差异均无统计学意义(均P＞0.05).视神经炎组患者黄斑1 mm区域RNFL、GCL、IPL平均厚度较正常对照组受检者明显变薄,视神经炎组患者黄斑3 mm区域GCL、IPL、INL平均厚度较正常对照组受检者明显变薄,差异均有统计学意义(均P＜0.05).视神经炎组患者P-VEP P100波潜伏期为(133.15±11.11)s,较正常对照组的(94.59±4.38)s明显延长,差异有统计学意义(t=15.058,P＜0.05).MD与视盘周围上方、下方、鼻侧3个象限的RNFL平均厚度呈中等线性正相关(r=O.649、0.649、0.635,均P＜0.05),而各象限脉络膜厚度与MD均无明显线性相关(r=-0.120、-0.102、-0.415、0.120,均P＞0.05);黄斑区RNFL、GCL、IPL、INL、OPL、ONL、光感受器层厚度与MD均无明显线性相关. 结论 EDI OCT检测发现视神经炎早期患者视盘周围RNFL发生水肿,厚度增加,黄斑区各层视网膜厚度均不同程度地变薄,但患者的脉络膜厚度无明显改变.EDI OCT是客观和定量评价视神经炎早期视网膜和脉络膜形态学的有用工具.
展开▼
