Dear Sir,Ifound the article by Sobac1etal[1]very interesting.The authors concluded that repeated intravitreal injection(IVI)of ranibizumab or bevacizumab didn’t seem have adverse effects on retinal nerve fiber layer(...Dear Sir,Ifound the article by Sobac1etal[1]very interesting.The authors concluded that repeated intravitreal injection(IVI)of ranibizumab or bevacizumab didn’t seem have adverse effects on retinal nerve fiber layer(RNFL)thickness in wet age-related macular degeneration(AMD)patients.展开更多
目的应用相干光断层扫描仪(OCT)测量中国正常人视网膜神经纤维层(RNFL)厚度并探讨年龄、屈光度、性别及视盘面积对平均RNFL厚度的影响。方法运用Stratus OCT 4.0测量202例不同年龄及不同屈光度正常人(年龄8～74岁,屈光度-8～+4D)各钟点...目的应用相干光断层扫描仪(OCT)测量中国正常人视网膜神经纤维层(RNFL)厚度并探讨年龄、屈光度、性别及视盘面积对平均RNFL厚度的影响。方法运用Stratus OCT 4.0测量202例不同年龄及不同屈光度正常人(年龄8～74岁,屈光度-8～+4D)各钟点、象限及平均RNFL厚度,建立多元线性回归方程探讨年龄、屈光度、性别及视盘面积对平均RNFL厚度的影响;同时采用方差分析的方法比较不同年龄及屈光度者平均RNFL厚度的差异。结果①正常人RNFL平均厚度为(108.63±9.70)μm,下方象限RNFL(I):(139.17±15.79)μm最厚,其次为上方象限(S):(134.61±17.80)μm,颞侧象限(T):(85.37±21.25)μm,鼻侧象限(N):(75.19±17.06)μm最薄,即I>S>T>N。②所得多元线性回归方程为y=-0.262x1+1.588x2+121.690(P1=0.000,P2=0.000;y代表平均RNFL厚度,x1代表年龄,x2代表屈光度),即平均RNFL厚度随着年龄的增长或近视度数的增加而变薄,未发现RNFL厚度与性别或视盘面积有关;方差分析表明50岁以上者平均RNFL厚度显著变薄,高度近视者平均RNFL厚度显著薄于正视者。结论OCT测得的正常人平均RNFL厚度主要与年龄、屈光度有关;未发现RNFL厚度与性别或视盘面积有关;应用规范、统一的OCT测量标准,建立人群为基础的并经相关影响因素校正的中国人RNFL正常值数据库对青光眼的早期诊断是非常必要的。展开更多
Background:The rigidity of the corneoscleral shell is an important biomechanical property which could be relevant in the pathophysiology of open-angle glaucoma(OAG).This study aims to evaluate the relationship between...Background:The rigidity of the corneoscleral shell is an important biomechanical property which could be relevant in the pathophysiology of open-angle glaucoma(OAG).This study aims to evaluate the relationship between ocular rigidity(OR)and glaucomatous damage as represented by structural optical coherence tomography(OCT)-based parameters such as retinal nerve fiber layer(RNFL)and ganglion cell layer+inner plexiform layer(GCL+IPL)thicknesses.These parameters characterize the retinal layers that contain neuronal structures that form the optic nerve.Methods:Sixty-six subjects(37 with early OAG,11 with moderate to advanced OAG,16 healthy)were recruited in this study.OR measurements were carried out using a non-invasive clinical method developed by our group.As described in Beaton et al.(2015),this method,which is based on Friedenwald’s equation,involves video-rate OCT imaging and automated choroidal segmentation,as well as dynamic contour tonometry to calculate the OR coefficient.RNFL and macular GCL thicknesses were acquired using the Cirrus SD-OCT(Carl-Zeiss Meditec,Dublin,CA,USA).Correlations between OR and structural parameters in all 66 eyes were assessed using SPSS.Results:Significant correlations were found between OR and the average GCL+IPL thickness(r=0.355,P=0.004)as well as the minimum GCL+IPL thickness(r=0.340,P=0.006).Direct correlations were also found between OR and RNFL thickness in the inferior quadrant(r=0.258,P=0.036)and inferior clock hour(r=0.313,P=0.011).Conclusions:In this study,we found a positive correlation between structural OCT-based parameters and OR,perhaps indicating more structural damage in less rigid eyes.These findings could provide insight unto the pathophysiology of OAG.Further investigation is warranted to confirm the role of OR in glaucoma and elucidate whether there is a subgroup of patients for which OR plays a greater role.展开更多
Optical coherence tomography(OCT)is an ocular imaging technique that can complement the neuro-ophthalmic assessment,and inform our understanding regarding functional consequences of neuroaxonal injury in the afferent ...Optical coherence tomography(OCT)is an ocular imaging technique that can complement the neuro-ophthalmic assessment,and inform our understanding regarding functional consequences of neuroaxonal injury in the afferent visual pathway.Indeed,OCT has emerged as a surrogate end-point in the diagnosis and follow up of several demyelinating syndromes of the central nervous system(CNS),including optic neuritis(ON)associated with:multiple sclerosis(MS),neuromyelitis optica spectrum disorder(NMOSD),and anti-myelin oligodendrocyte glycoprotein(MOG)antibodies.Recent advancements in enhanced depth imaging(EDI)OCT have distinguished this technique as a new gold standard in the diagnosis of optic disc drusen(ODD).Moreover,OCT may enhance our ability to distinguish cases of papilledema from pseudopapilledema caused by ODD.In the setting of idiopathic intracranial hypertension(IIH),OCT has shown benefit in tracking responses to treatment,with respect to reduced retinal nerve fiber layer(RNFL)measures and morphological changes in the angling of Bruch’s membrane.Longitudinal follow up of OCT measured ganglion cell-inner plexiform layer thickness may be of particular value in managing IIH patients who have secondary optic atrophy.Causes of compressive optic neuropathies may be readily diagnosed with OCT,even in the absence of overt visual field defects.Furthermore,OCT values may offer some prognostic value in predicting post-operative outcomes in these patients.Finally,OCT can be indispensable in differentiating optic neuropathies from retinal diseases in patients presenting with vision loss,and an unrevealing fundus examination.In this review,our over-arching goal is to highlight the potential role of OCT,as an ancillary investigation,in the diagnosis and management of various optic nerve disorders.展开更多
文摘Dear Sir,Ifound the article by Sobac1etal[1]very interesting.The authors concluded that repeated intravitreal injection(IVI)of ranibizumab or bevacizumab didn’t seem have adverse effects on retinal nerve fiber layer(RNFL)thickness in wet age-related macular degeneration(AMD)patients.
文摘目的应用相干光断层扫描仪(OCT)测量中国正常人视网膜神经纤维层(RNFL)厚度并探讨年龄、屈光度、性别及视盘面积对平均RNFL厚度的影响。方法运用Stratus OCT 4.0测量202例不同年龄及不同屈光度正常人(年龄8～74岁,屈光度-8～+4D)各钟点、象限及平均RNFL厚度,建立多元线性回归方程探讨年龄、屈光度、性别及视盘面积对平均RNFL厚度的影响;同时采用方差分析的方法比较不同年龄及屈光度者平均RNFL厚度的差异。结果①正常人RNFL平均厚度为(108.63±9.70)μm,下方象限RNFL(I):(139.17±15.79)μm最厚,其次为上方象限(S):(134.61±17.80)μm,颞侧象限(T):(85.37±21.25)μm,鼻侧象限(N):(75.19±17.06)μm最薄,即I>S>T>N。②所得多元线性回归方程为y=-0.262x1+1.588x2+121.690(P1=0.000,P2=0.000;y代表平均RNFL厚度,x1代表年龄,x2代表屈光度),即平均RNFL厚度随着年龄的增长或近视度数的增加而变薄,未发现RNFL厚度与性别或视盘面积有关;方差分析表明50岁以上者平均RNFL厚度显著变薄,高度近视者平均RNFL厚度显著薄于正视者。结论OCT测得的正常人平均RNFL厚度主要与年龄、屈光度有关;未发现RNFL厚度与性别或视盘面积有关;应用规范、统一的OCT测量标准,建立人群为基础的并经相关影响因素校正的中国人RNFL正常值数据库对青光眼的早期诊断是非常必要的。
文摘Background:The rigidity of the corneoscleral shell is an important biomechanical property which could be relevant in the pathophysiology of open-angle glaucoma(OAG).This study aims to evaluate the relationship between ocular rigidity(OR)and glaucomatous damage as represented by structural optical coherence tomography(OCT)-based parameters such as retinal nerve fiber layer(RNFL)and ganglion cell layer+inner plexiform layer(GCL+IPL)thicknesses.These parameters characterize the retinal layers that contain neuronal structures that form the optic nerve.Methods:Sixty-six subjects(37 with early OAG,11 with moderate to advanced OAG,16 healthy)were recruited in this study.OR measurements were carried out using a non-invasive clinical method developed by our group.As described in Beaton et al.(2015),this method,which is based on Friedenwald’s equation,involves video-rate OCT imaging and automated choroidal segmentation,as well as dynamic contour tonometry to calculate the OR coefficient.RNFL and macular GCL thicknesses were acquired using the Cirrus SD-OCT(Carl-Zeiss Meditec,Dublin,CA,USA).Correlations between OR and structural parameters in all 66 eyes were assessed using SPSS.Results:Significant correlations were found between OR and the average GCL+IPL thickness(r=0.355,P=0.004)as well as the minimum GCL+IPL thickness(r=0.340,P=0.006).Direct correlations were also found between OR and RNFL thickness in the inferior quadrant(r=0.258,P=0.036)and inferior clock hour(r=0.313,P=0.011).Conclusions:In this study,we found a positive correlation between structural OCT-based parameters and OR,perhaps indicating more structural damage in less rigid eyes.These findings could provide insight unto the pathophysiology of OAG.Further investigation is warranted to confirm the role of OR in glaucoma and elucidate whether there is a subgroup of patients for which OR plays a greater role.
文摘Optical coherence tomography(OCT)is an ocular imaging technique that can complement the neuro-ophthalmic assessment,and inform our understanding regarding functional consequences of neuroaxonal injury in the afferent visual pathway.Indeed,OCT has emerged as a surrogate end-point in the diagnosis and follow up of several demyelinating syndromes of the central nervous system(CNS),including optic neuritis(ON)associated with:multiple sclerosis(MS),neuromyelitis optica spectrum disorder(NMOSD),and anti-myelin oligodendrocyte glycoprotein(MOG)antibodies.Recent advancements in enhanced depth imaging(EDI)OCT have distinguished this technique as a new gold standard in the diagnosis of optic disc drusen(ODD).Moreover,OCT may enhance our ability to distinguish cases of papilledema from pseudopapilledema caused by ODD.In the setting of idiopathic intracranial hypertension(IIH),OCT has shown benefit in tracking responses to treatment,with respect to reduced retinal nerve fiber layer(RNFL)measures and morphological changes in the angling of Bruch’s membrane.Longitudinal follow up of OCT measured ganglion cell-inner plexiform layer thickness may be of particular value in managing IIH patients who have secondary optic atrophy.Causes of compressive optic neuropathies may be readily diagnosed with OCT,even in the absence of overt visual field defects.Furthermore,OCT values may offer some prognostic value in predicting post-operative outcomes in these patients.Finally,OCT can be indispensable in differentiating optic neuropathies from retinal diseases in patients presenting with vision loss,and an unrevealing fundus examination.In this review,our over-arching goal is to highlight the potential role of OCT,as an ancillary investigation,in the diagnosis and management of various optic nerve disorders.
