Nerve fibre layer changes in highly myopic eyes by optical coherence tomography

Objective: The purpose of this study was to investigate any correlations that may exist between retinal nerve fibre layer (RNFL) thickness and high myopia by optical coherence tomography (OCT).Design: Case-control study.Participants: Ten patients (20 eyes) with high myopia and 10 control patients (20 eyes) matched for age and sex were recruited from a database search of 1 vitreoretinal practice in Regina, Sask.Methods: The RNFL thickness of 10 highly myopic patients and 10 control patients matched for age and sex from a clinical practice was determined using the Stratus OCT. All 10 highly myopic patients selected for the study had a spherical equivalent of ≥−10.0 D OU and an intraocular pressure <21 mm Hg OU, and failed to display glaucomatous changes such as disc hemorrhages and glaucomatous cupping in either eye. None of the patients included in the study had evidence of concomitant ophthalmic disease and none had had previous refractive surgery. Axial length measurements were done on all patients using the IOL Master.Results: The mean (SD) RNFL thicknesses in the control and myopic groups were 108.8 (10.6) μm and 80.0 (18.6) μm, respectively, with t = 6.0 and p − 0.001. A negative correlation of −0.712 with p < 0.001 was found between RNFL thickness and axial length.Conclusions: When interpreting the RNFL thickness of highly myopic patients by OCT, careful attention must be given to the inherently thinner RNFL to avoid a false glaucoma diagnosis.     

Correlation between optic nerve head parameters and retinal nerve fibre layer thickness measured by spectral-domain optical coherence tomography in myopic eyes

Background: To evaluate the correlation between optic nerve head parameters and retinal nerve fiber layer thickness measured by Cirrus HD spectral‐domain optical coherence tomography (Cirrus HD‐OCT; Carl Zeiss Meditec) in healthy myopic eyes. Design: Cross‐sectional study. Participants: One hundred and sixty‐one right eyes from 161 healthy young myopic subjects. Methods: Optic nerve head parameters and retinal nerve fiber layer thickness were measured with the Cirrus HD‐OCT. The distance between optic disc margin and scan circle (disc margin‐to‐scan distance) was measured on the Cirrus HD‐OCT en‐face optic nerve head image with aid of National Institutes of Health ImageJ image‐analysis software (developed by Wayne Rasbands, National Institutes of Health, Bethesda, MD). Main Outcome Measures: The correlations among optic nerve head parameters, retinal nerve fibre layer thickness and the disc margin‐to‐scan distance were evaluated with and without adjustment of the magnification effect. Results: Without correction of the magnification effect, the thicker average retinal nerve fiber layer was correlated with greater rim area and lower degree of myopia (P < 0.001). When the magnification effect was corrected, thicker average retinal nerve fibre layer was associated with greater disc area and greater rim area in univariate and multivariate analyses (P ≤ 0.028); however, degrees of myopia and the disc margin‐to‐scan distance were not significantly associated with average RNFL thickness (P ≥ 0.104). Conclusions: Thicker average retinal nerve fibre layer thickness was associated with greater rim and disc areas. Disc margin‐to‐scan distance was not significantly correlated with average retinal nerve fibre layer thickness in healthy myopic eyes.     

近视眼视网膜神经纤维层厚度分析

目的:分析近视眼患者与正常人视网膜神经纤维层厚度的差异,探讨近视程度对视网膜神经纤维层厚度的影响。方法:采用视神经分析仪-GDxVCC(美国激光技术诊断公司生产)测量正常人23例42眼和近视眼患者85例166眼视网膜神经纤维层厚度,近视眼患者按等效球镜屈光度分为低、中、高、超高度近视四组,将所得结果用SPSS11.5统计软件包进行统计分析。结果:视乳头周围2.4～3.2mm的环形区域视网膜神经纤维层平均厚度正常人与低、中、高度及超高度近视组比较无显著性差异,不同程度近视眼组两两之间进行比较无显著性差异;上方120°区域视网膜神经纤维层厚度高度、超高度近视眼组与其他各组进行比较有非常显著性差异(P<0.01),高度与超高度近视组之间进行比较有显著性差异(P<0.01),其他各组两两之间进行比较无显著性差异;下方120°区域视网膜神经纤维层厚度各组之间进行比较无显著性差异;环形区域RNFL厚度平均值的标准差超高度近视组与其余各组之间的差异具有显著性(P<0.05);神经纤维指数高度近视组、超高度近视组与其他各组差异有显著性,且与屈光度呈线性关系(P<0.05)。结论:随着近视程度的增加,近视眼患者上方120!范围内视网膜神经纤维层厚度逐渐变薄,神经纤维指数逐渐增加。     

Nomogram of peripapillary retinal nerve fiber layer thickness in myopic eyes of north Indian population

Purpose:To evaluate peripapillary-RNFL thickness in myopia by Cirrus OCT among north Indian population by spherical equivalent (SE), age, gender, and axial length (AL).Methods:This was a cross-sectional study held during 2019–2020. Patients aged 18–60 years underwent ophthalmic examination including retinoscopy, AL, and OCT RNFL thickness. Persons with previous ocular surgery or ocular ailment other than refractive error were excluded. The peripapillary-RNFL thickness was noted and compared by demographic determinants.Results:We examined 300 eyes of 300 persons (mean age: 30.75 ± 8.57 years; 144 males/156 females). Among them, 224 were myopes and 76 were emmetropes (EM). The mean SE was − 3.3 ± 0.4D (range: −11.0D to + 0.37D). The mean AL was 24.61 ± 1.92 mm (22.1–29.5). Overall temporal, nasal, superior, inferior, and mean peripapillary-RNFL thickness was 66.31 ± 7.58, 78.57 ± 16.00, 120.63 ± 11.69, 116.60 ± 15.80, and 95.50 ± 10.84 mm, respectively. Temporal, nasal, superior, inferior, and mean peripapillary-RNFL thickness was 73.97 ± 8.36, 94.84 ± 7.63, 127.96 ± 8.96, 136.89 ± 6.53, and 108.34 ± 6.28 mm, respectively, in EM eyes as compared to 63.71 ± 6.18, 73.05 ± 14.24, 118.21 ± 11.53, 109.71 ± 11.50, and 91.14 ± 8.31 mm, respectively, in myopic eyes (P < 0.001). Association of peripapillary-RNFL thickness with myopia and its different grades was P < 0.001. Association of mean peripapillary-RNFL thickness with age was P > 0.005 and gender was P = 0.168. Correlation between SE and RNFL thickness was positive and significant. Correlation between AL and RNFL thickness was negative but statistically significant. Association of AL with SE was P < 0.001.Conclusion:We provide normative peripapillary-RNFL thickness in the north Indian population in order to help in screening for myopia with comorbidity such as glaucoma based on RNFL thickness.     

Changes of retinal vessel density in low to moderate myopic eyes with orthokeratology evaluated by optical coherence tomography angiography

AIM: To explore the effect of orthokeratology (OK) fitting on retinal vessel density in low to moderate myopia adolescents by using optical coherence tomography angiography.METHODS: Children aged 10 to 14y with a cycloplegic spherical equivalent refraction of −0.50 diopter (D) to −5.00 D and astigmatism with more than −1.50 D were recruited. The enrolled adolescents were divided into OK group and spectacle group. During regular follow-up, adolescents were measured respectively at pre-wear, 1, 3, and 6mo after treatment. The follow-up included uncorrected distance visual acuity (UDVA), axial length (AL), superficial capillary plexus density (SCPD), deep capillary plexus density (DCPD), central retinal thickness (CRT), foveal avascular zone area (FAZ-A), foveal avascular zone perimeter (FAZ-P) and foveal vessel density in a 300-µm-wide region around foveal avascular zone (FD-300). The collected data were analyzed using statistical methods.RESULTS: By one month, SCPD significantly increased in the fovea and superior retina, and DCPD significantly increased inferiorly in OK group compared to spectacle group (P<0.05). By three months, there were significant increases in SCPD in the fovea and inferior retina, and DCPD in the parafovea, superior, and inferior retina in OK group (P<0.05), while the increase in SCPD and DCPD in the fovea were observed by six months (P<0.05). The FD-300 significantly increased at every follow-up in OK group compared to spectacle group (P<0.05). No significant differences in the CRT, FAZ-A and FAZ-P and FD-300 were observed between two groups (P>0.05). OK group showed a significant improvement in UDVA after wearing OK, compared to spectacle group (P<0.01), while the AL did not show a significant difference between two groups (P>0.05).CONCLUSION: Short-term OK worn can increase local retinal vessel density in adolescents with low-to-moderate myopia.     

Study of long term structural and functional changes in medically controlled glaucoma

AIM:Prospectively analyze the long term structural and functional changes in patients of primary open angle glaucoma (POAG) receiving medical therapy (beta blockers and non beta blockers). In this study an attempt has been made to evaluate whether medical reduction of IOP prevents or delays the progression of glaucomatous visual field loss and/or optic nerve damage in patients with open angle glaucoma.METHODS:Study conducted over a period of 27 months, at a tertiary eye care hospital including both eyes of 40 patients with POAG. Group 1 (20 patients, 40 eyes) received beta-blockers, and Group 2 (20 patients, 40 eyes) received non-beta-blockers. Each patient underwent intraocular pressure measurement, best corrected visual acuity, slit-lamp, fundus examination, gonioscopy, central corneal thickness, visual field assessment by Humphrey automated perimetry and retinal nerve fibre layer thickness by Stratus optical coherence tomography at baseline and at two subsequent visits. The average time interval between each visit was 10-11 months. The statistical analysis was done using one-way analysis of variance (ANOVA). Post-hoc test, using tukey’ method were adopted. Probablity (P) value of 0.05 or less was considered to be statistically significant.RESULTS:A total of 80 eyes of 40 patients of POAG were enrolled, 24 males, 16 females, age group 50-80 years. In both beta and non beta blocker group, reduction (improvement) in mean IOP from initial levels to the levels achieved at the 2nd and 3rd visits was statistically significant. One way ANOVA (df=2), fisher f value=11.64, P=0.000, one way ANOVA (df=3), fisher f value=35.61, P=0.000. Both mean deviation (MD) and pattern standard deviation (PSD) in both beta and non beta blockers at different visits were not statistically significant. Retinal nerve fibre layer thickness (RNFL) -only mean inferior retinal nerve fibre layer, the difference between the mean value in beta and non beta blocker groupwere statistically significant. [unpaired t test value (df=78) =2.27, P=0.03]. Side effects with beta blocker were conjunctival hyperemia (10%), burning (5%), and conjunctival hyperemia (5%) in non beta blockers.CONCLUSION: Non-beta-blockers are as effective as beta-blockers in bringing about a significant lowering of intraocular pressure to the normal range, and in preventing progressive damage to the visual fields and retinal nerve fibre layer. The absence of systemic side effects and superior IOP lowering efficacy has made non beta-blockers attractive for first line therapy for the treatment of glaucoma worldwide.     

不同近视程度儿童视神经纤维层厚度的改变

目的:探讨4 ～ 10岁不同近视程度儿童视神经纤维层(retinal nerve fiber layer,RNFL)厚度改变.方法:收集2012-01/2014-05于我院就诊的高度近视儿童12例(屈光度≥-6.00D),中度近视儿童14例(-3.00D≤屈光度＜-6.00D),轻度近视儿童14例(0D≤屈光度＜-3.00D),对所有患儿完善RNFL厚度测量,并进行组间对比.结果:高度近视组平均RNFL厚度为102.36±10.33μm,中度近视组平均RNFL厚度为106.52±9.46μm,轻度近视组平均RNFL厚度为112.66±9.79μm.高度近视组较轻度近视组儿童平均RNFL厚度变薄,差异具有统计学意义(P＜0.05);高度近视组与中度近视组、中度近视组与轻度近视组相比,RNFL差异无统计学意义(P＞0.05);在下方象限,高度近视组与轻度近视组,中度近视组与轻度近视组RNFL对比差异具有统计学意义(P＜0.05),其余三组各象限对比差异均无统计学意义.结论:在高度近视患者平均R较轻度近视组明显变薄,且在下方象限高度近视与中度近视组较轻度近视组均明显变薄.在对近视儿童的诊疗过程中,我们应当完善近视RNFL厚度检查辅助诊断,可为近视儿童的观察及随访提供客观指标.     

近视眼黄斑区视网膜色素上皮层厚度及形态与对比敏感度的联系

目的：探讨近视眼视网膜色素上皮层争神经纤维层厚度及其形态与对比敏感度值的联系。方法：21例近视眼病例，39眼做光学相干断层扫描（optical ezherene etomography，OCT），扫描测量并观察黄斑区的视网膜神经纤维层和色素层的厚度和形态；以F．A．C．T对比敏感度测试卡测量各个频率的对比敏感度值；采用Spearman等级相关分析法，分析对比敏感度与近视眼底萎缩弧以及视网膜色素上皮层、视网膜神经纤维层厚度之间的联系；比较不同视网膜色素上皮病变程度的近视眼病例的对比敏感度值。结果：在黄斑区视网膜色素上皮层平均厚度与高频（12、18cpd）对比敏感度值之间存在具有正相关，有显著性意义（r=0．452、0．437，P均〈0．001），而神经纤维层厚度与对比敏感度之间无相关（P均〉0．05）；视网膜色素上皮存在明显病理改变的眼球其对比敏感度功能显著降低（P均〈0．05）。结论：发生眼底病理性改变的近视眼，其对比敏感度降低的视网膜解剖基础是黄斑区视网膜色素上皮层发生病变。     

Assessment of changes in optic disc parameters and peripapillary retinal nerve fiber layer thickness in myopic patients and its correlation with axial length and degree of myopia

Purpose:The present study aimed to assess the changes in optic disc and peripapillary retinal nerve fiber layer (RNFL) parameters in myopic patients and its correlation with axial length (AL) and spherical equivalent (SE) using optical coherence tomography (OCT).Methods:This was a cross-sectional study carried out from August 2019 to September 2021 in the ophthalmology department of a tertiary care hospital in eastern India. Myopic patients in the age group of 20–40 years and SE between − 0.5 to − 10 Diopters (D) were included in the study. Patients were divided into two groups on the basis of degree of myopia and AL. Appropriate statistical analysis was done at the end of the study period.Results:The study included 307 eyes of 307 myopic patients. There were 181 females (58.96%) and 126 males (41.04%). The mean age of the patients enrolled for the study was 28.78 ± 5.76 years. Statistically significant difference (P < 0.001) was found between SE and AL in between the subgroups of A and B. With every 1 D increase in SE, the average peripapillary RNFL thickness decreased by 0.61 µ while with every 1 mm increase in AL, the average peripapillary RNFL thickness was found to reduce by 1.03 µ.Conclusion:Analysis of optic nerve head parameters and RNFL thickness by OCT for the diagnosis should be compared with a normative control group that has been matched for refractive error and AL instead of comparison with a normative database that has only been age matched.     

Distribution characteristics of retinal nerve fiber layer thickness in macular area and its relationship with vessel density in highly myopic eyes

AIM: To investigate the distribution characteristics of retinal nerve fiber layer thickness and vessel density in macular area of eyes with high myopia, using optical coherence tomography angiography (OCTA). METHODS: Forty eyes in 20 patients diagnosed with high myopia, age 29.90±7.92 years old, with a spherical equivalent of -8.95±2.01 D, were recruited. The retinal nerve fiber layer (RNFL) thickness and the vessel density of the superficial retinal capillary plexus, deep retinal capillary plexus, and choroidal capillary were measured by OCTA. Macular regions within a 6-mm diameter circle were divided into 9 subfields: the central subfield, and the pericentral and peripheral regions of superior, inferior, nasal, and temporal quadrants. The retinal nerve fiber layer thicknesses of different subfields were compared, and their relationships with spherical equivalent, axial length, and vessel density were analyzed. RESULTS: In the pericentral region, the retinal nerve fiber layer thickness of the superior quadrant was the lowest, whereas thickness was highest in the inferior quadrant (all P<0.05). In the peripheral region, the retinal nerve fiber layer thickness of the temporal quadrant was the lowest (all P<0.05). A negative correlation was found between the retinal nerve fiber layer thickness and spherical equivalent (r=-0.356, P=0.024) in the peripheral superior subfield. The vessel density of superficial retinal capillary plexus was positively correlated with retinal nerve fiber layer thickness in the nasal and inferior quadrants of the pericentral region and in the superior, nasal, and inferior quadrants of the peripheral region (r=0.314, 0.408, 0.467, 0.655, and 0.737 respectively; and all P<0.05), whereas the vessel density of choroidal capillary was negatively correlated with retinal nerve fiber layer thickness in the peripheral superior subfield (r= -0.356, P=0.024). CONCLUSION: The RNFL of macular areas is not uniformly distributed in high myopia (HM). As the spherical equivalent (SE) increases, the RNFL thickness decreases in certain areas, which correlates with the vessel density(VD) of superficial retinal capillary plexus (SCP) and choroidal capillary (CC) layers.     

高度近视眼黄斑区神经纤维层厚度分布特点及其与血流密度的关系

目的：研究高度近视眼黄斑区神经纤维层厚度和血流密度的分布特点并分析其相关因素。

方法：收集高度近视患者20例40眼,年龄为29.90±7.92岁,等效球镜屈光度为 -8.95±2.01 D。采用光学相干断层扫描血管成像技术(OCTA)测量黄斑区神经纤维层厚度,获取视网膜浅层毛细血管层、视网膜深层毛细血管层及脉络膜毛细血管层的血流分布图像并计算各层血流密度。直径6 mm的黄斑区分为9个亚区域：黄斑中心凹区,旁中心凹区和中心凹外区各自分为上方、下方、鼻侧和颞侧4个象限。比较黄斑不同亚区域的神经纤维层厚度的差别,分析其与屈光度、眼轴、各层血流密度的关系。

结果：旁中心凹区的4个象限中,上方神经纤维厚度最低,下方神经纤维厚度最高(均P<0.05)。中心凹外区4个象限中颞侧神经纤维厚度最低(均P<0.05)。中心凹外区上方神经纤维层厚度与屈光度存在负相关(r= -0.356,P=0.024)。视网膜浅层毛细血管层的血流密度与旁中心凹区鼻侧和下方象限,以及中心凹外区上方、鼻侧和下方象限的神经纤维层厚度呈正相关(r=0.314、0.408、0.467、0.655、0.737,均P<0.05); 脉络膜毛细血管层血流密度与中心凹外区的上方象限呈负相关(r=-0.356,P=0.024)。

结论：高度近视眼黄斑区神经纤维层具有各象限不均匀分布特点。随着屈光度的增加,局部神经纤维层变薄,并且存在区域特异性,部分区域神经纤维层厚度的变化与视网膜浅层毛细血管丛及脉络膜毛细血管层的血流密度相关。     

青年近视患者无症状视网膜裂孔的特征与处理

目的探讨青年近视患者无症状视网膜裂孔的特征及处理方法。方法对无任何自觉症状要求做角膜屈光手术的近视患者进行眼底检查,比较不同屈光度患者中视网膜裂孔的发生率。结果视网膜裂孔的发生率为2·43%,其中88%为变性萎缩孔。低度、中度、高度近视的视网膜裂孔发生率分别为0·17%、1·93%、22%(P<0·01)。经眼底激光治疗后接受准分子激光手术的33眼中31眼眼底病情稳定。结论青年近视患者无症状视网膜裂孔中变性萎缩孔最常见,视网膜裂孔的发生率随着屈光度的增加而明显上升。氩激光对干性视网膜裂孔和局限性视网膜脱离疗效较好。     

近视眼视网膜神经纤维层厚度光学相干断层扫描特点

目的:探讨人视网膜神经纤维层(retinal nerve fiber layer,RNFL)厚度随近视眼屈光度及眼轴变化而变化的特点。方法:将近视眼60例108眼分为低、中、高度近视组和正常对照组25例32眼,应用光学相干断层扫描仪(OCT)进行以视盘为中心,直径3.46mm圆周的RNFL厚度测量,研究近视眼平均RNFL厚度与屈光度及眼轴长度的相关性,并计算各组平均RNFL厚度及上、下、鼻、颞4个象限的RNFL厚度,分别比较各近视组与正常组RNFL的差别。结果:近视眼平均RNFL厚度与屈光度呈负相关(r=-0.535,P<0.05),与眼轴成负相关(r=-0.693,P<0.01)。分区分析低度近视组、中度近视组、高度近视组平均RNFL厚度变薄与正常对照组相比有显著统计学差异(P<0.01),近视眼各象限RNFL厚度最早变薄的是鼻侧象限,低度近视组即与正常人有统计学差异(P<0.05),高度近视组上、下、鼻象限RNFL厚度均明显变薄(P<0.01)与正常人相比有显著统计学差异,颞侧象限RNFL反而增厚,但与正常人无统计学差异(P>0.05)。结论:近视眼视网膜神经纤维层厚度随眼轴长度及眼屈光度的增加而减少,分区分析上、下、鼻象限变化与平均相一致,而颞侧增厚,这可能是近视眼RNFL的特点,这些特点对临床疾病的诊断具有指导意义,特别是出现异常数值时,要考虑屈光度及眼轴的影响,综合评价临床意义。     

不同程度近视患者视网膜神经纤维层厚度和神经节细胞复合体参数的变化

目的:比较低度、中度和高度近视非青光眼受试者通过光谱域光学相干断层扫描技术(SD-OCT)测量的视网膜神经纤维层(RNFL)和黄斑神经节细胞复合体(GCC)参数的变化。方法:选择2019-12/2022-11期间在我院就诊的近视受试者400例400眼参与本研究,根据受试者近视程度分为：低度近视组(142例142眼,35.5%)、中度近视组(139例139眼,34.8%)和高度近视组(119例119眼,29.8%)。测量RNFL厚度,包括均值、上方、下方、鼻侧、颞侧RNFL厚度。测量GCC参数,包括均值、上方、颞上方、下方、颞下方、鼻上方、鼻下方。评估OCT测量的RNFL厚度、GCC参数均值与眼轴长度之间的相关性。结果:低度近视组和中度近视组的上方、下方、鼻侧、平均RNFL厚度明显高于高度近视组,颞侧RNFL厚度明显低于高度近视组(均P<0.05);低度近视组和中度近视组的上方、颞上方、下方、颞下方、鼻上方、鼻下方、平均GCC厚度明显高于高度近视组(均P<0.05);在中度近视组中,RNFL和GCC厚度均值与眼轴长度均呈负相关(r=-0.387、-0.309,均P<0....     

高度近视性弱视儿童视盘周围视网膜神经纤维层厚度分析

目的：分析高度近视性弱视儿童视盘周围视网膜神经纤维层厚度特点,并探讨与眼轴、年龄的关系。
　　方法：选择收集2014-01/07间在我院眼科门诊就诊的儿童35例59眼,平均年龄9.59±2.90岁,所有受检眼排除眼底的疾病和眼前节的病变。根据扩瞳验光的结果,分成高度近视性弱视组(22眼)、高度近视组(15眼)、正视眼组(22眼),运用频域OCT对视盘周围视网膜神经纤维层进行检测,通过A超测量出所有受检者眼轴长度。对各组视盘周围各方位视网膜神经纤维层厚度进行比较分析,探讨视盘周围各方位视网膜神经纤维层与眼轴、年龄的关系。
　　结果：高度近视性弱视组视盘颞侧RNFL厚度薄于高度
　　近视组,厚于正视眼组;视盘鼻侧、上方、下方、周围平均RNFL厚度与高度近视组、正视眼组相比均最薄,其中视盘下方及周围平均RNFL厚度与高度近视组相比变薄,有统计学差异(P<0.05),视盘鼻侧、上方、下方、周围平均RNFL厚度与正视眼组相比明显变薄,有统计学差异( P<0.01)。高度近视组视盘颞侧RNFL厚度与正视眼组相比明显增厚,视盘鼻侧、上方、下方、周围平均RNFL厚度与正视眼组相比均明显变薄,有统计学差异(P<0.05)。高度近视性弱视组视盘下方RNFL厚度与眼轴呈负相关性( R=0.474, R2=0.225, F=4.933, P=0.040)。高度近视组视盘上方RNFL厚度与眼轴呈负相关性(R=0.642, R2=0.412,F=9.104,P=0.010)。高度近视性弱视组、高度近视组、正视眼组各方位RNFL厚度与年龄均无明显相关性。
　　结论：高度近视性弱视儿童视网膜结构存在异常。     

急性原发性闭角型青光眼视网膜血流密度与神经纤维层的相关性

目的:观察急性原发性闭角型青光眼(APACG)患者黄斑和视盘周围血流密度及其与神经纤维层的相关性。方法:前瞻性纳入2019-03-01/12-31在徐州医科大学附属医院就诊的单眼APACG患者29例,发作眼29眼为试验组,对侧眼29眼为对照组,发作眼行复合式小梁切除术,对侧眼行预防性虹膜周边激光切除术。分别于术前、术后1wk,1、3、6mo行光学相干断层扫描血管成像(OCTA)检查,观察黄斑血流密度(MVD)、视盘周围血流密度(cpVD)及神经纤维层(RNFL)厚度的变化情况。结果:术前试验组上颞、颞上象限视盘cpVD均较对照组低(P<0.01),术后1wk试验组各象限短暂上升,但上鼻、上颞、颞上象限仍低于对照组(均P<0.05)。术后1、3、6mo时,试验组各象限cpVD和MVD随时间变化呈持续下降趋势,且RNFL厚度在术后6mo内先增厚,后逐渐下降,至术后6mo时均较对照组变薄。相关性分析显示,试验组术后6mo时视盘cpVD与RNFL厚度在上鼻、上颞、颞下、下颞、下鼻、鼻下象限呈正相关关系(均P<0.05)。结论:APACG急性发作后早期患眼RNFL增厚,3~6mo时逐渐变薄,而视盘cpVD持续降低,并在术后6mo时与RNFL厚度存在相关关系。     

Change in foveal position based on age and axial length in high myopic eyes

AIM: To evaluate the influence of age and axial length (AL) on the position of the fovea in patients with high myopia (HM). METHODS: In this prospective study, 96 patients (186 eyes) with HM were consecutively recruited from the Third Affiliated Hospital of Nanchang University. DRI-OCT Atlantis, fundus imaging, and IOL Master were used in this study. Three indices were measured: the distance between the fovea and the optic nerve head (ONH) center (DFO), the vertical distance between the fovea and the horizontal line pass of the ONH center (VDFO), and the horizontal distance between the fovea and the vertical line pass of the ONH center (HDFO). These measurements were used to analyze the effects of different age groups (A1, A2, A3 groups) and AL (AL1, AL2, AL3, AL4 groups) on these indices. RESULTS: The results showed that there was no statistical significance in DFO among the age and AL groups (F=0.46, 0.37; P=0.62, 0.76, respectively). In HDFO, there was also no statistical significance among the age and AL groups (F=0.10, 0.48; P=0.90, 0.69, respectively). In VDFO, however, the difference in the age and AL groups was statistically significant (F=3.21, 3.12; P=0.04, 0.02, respectively). Thus, VDFO were correlated with age and AL (r=0.21, 0.23, all P<0.01), while HDFO and DFO were not correlated with age and AL (r=0.30, P>0.05). CONCLUSION: In high myopia, the foveal position changes mainly in the vertical direction along with factors of age and AL.