One-year results for myopia control of orthokeratology with different back optic zone diameters: a randomized trial using a novel multispectral-based topographer

AIM:To present the 1-year results of a prospective cohort study investigating the efficacy,potential mechanism,and safety of orthokeratology(ortho-k)with different back optic zone diameters(BOZD)for myopia control in children.METHODS:This randomized clinical study was performed between Dec.2020 and Dec.2021.Participants were randomly assigned to three groups wearing ortho-k:5 mm BOZD(5-MM group),5.5 mm BOZD(5.5-MM group),and 6 mm BOZD(6-MM group).The 1-year data were recorded,including axial length,relative peripheral refraction(RPR,measured by multispectral refractive topography,MRT),and visual quality.The contrast sensitivity(CS)was evaluated by CSV-1000 instrument with spatial frequencies of 3,6,12,and 18 cycles/degree(c/d);the corneal higher-order aberrations(HOAs)were measured by iTrace aberration analyzer.The one-way ANOVA was performed to assess the differences between the three groups.The correlation between the change in AL and RPR was calculated by Pearson’s correlation coefficient.RESULTS:The 1-year results of 20,21,and 21 subjects in the 5-MM,5.5-MM,and 6-MM groups,respectively,were presented.There were no statistical differences in baseline age,sex,or ocular parameters between the three groups(all P>0.05).At the 1-year visit,the 5-MM group had lower axial elongation than the 6-MM group(0.07±0.09 vs 0.18±0.11 mm,P=0.001).The 5-MM group had more myopic total RPR(TRPR,P=0.014),with RPR in the 15°–30°(RPR 15–30,P=0.015),30°–45°(RPR 30–45,P=0.011),temporal(RPR-T,P=0.008),and nasal area(RPR-N,P<0.001)than the 6-MM group.RPR 15–30 in the 5.5-MM group was more myopic than that in the 6-MM group(P=0.002),and RPR-N in the 5-MM group was more myopic than that in the 5.5-MM group(P<0.001).There were positive correlations between the axial elongation and the change in TRPR(r=0.756,P<0.001),RPR 15–30(r=0.364,P=0.004),RPR 30–45(r=0.306,P=0.016),and RPR-N(r=0.253,P=0.047).The CS decreased at 3 c/d(P<0.001),and the corneal HOAs increased in the 5-MM group(P=0.030).CONCLUSION:Ortho-k with 5 mm BOZD can control myopia progression more effectively.The mechanism may be associated with greater myopic shifts in RPR.

Comparative study of functional optical zone:small incision lenticule extraction versus femtosecond laser assisted excimer laser keratomileusis

AIM:To investigate the size of functional optical zone(FOZ)after small incision lenticule extraction(SMILE)versus femtosecond laser assisted excimer laser keratomileusis(FS-LASIK)for myopia correction and potential associated factors for FOZ.METHODS:A total of 133 patients who received corneal refractive surgery in our hospital between November 2018 and July 2021 were retrospectively enrolled.There were 63 patients(123 eyes)in SMILE group and 70patients(139 eyes)in FS-LASIK group.The size of FOZ was measured using Pentacam 3-dementional anterior segment analyzer before and 3mo after surgery,so as to analyze postoperative achieved functional optical zone(AFOZ)and its contributing parameters.RESULTS:When planned functional optical zone(PFOZ)was 6.5 mm for both groups,AFOZ was 1.45±0.27 and 1.67±0.25 mm smaller than preoperative FOZ in SMILE group and FS-LASIK group 3mo after surgery.AFOZ in SMILE group was significantly larger than that in FS-LASIK group(P<0.001).Variation of FOZ was negatively correlated with preoperative spherical equivalent(SE)and positively correlated with variation of mean keratometry value(△Km),variation of spherical aberration(△SA),and variation of Q-value(△Q,all P<0.001)in both groups.Multiple variable linear regression equations were△FOZ=1.354-0.1×pre-SE+0.336×△Q+1.462×△SA in SMILE group and△FOZ=1.512+0.137×△Q+0.468×△SA in FS-LASIK group.CONCLUSION:AFOZ is significantly smaller than preoperative FOZ in both SMILE and FS-LASIK groups.With the same PFOZ,larger AFOZ is achieved in SMILE group than in FS-LASIK group.

Quantitative Assessment of Foveal Avascular Zone in Patients with Early and Intermediate Nonexudative Age-Related Macular Degeneration Using Optical Coherence Tomography-Angiography

Optical coherence tomography-angiography (OCT-A) is a relatively new non-invasive imaging technique which provides three-dimensional visualization of the retinal and choroidal microvasculature. Recently, OCT-A is widely used in the diagnosis of age-related macular degeneration (AMD). Purpose: To compare 3 quantitative indexes of foveal avascular zone (FAZ)—area (A), perimeter (Pm), and circularity (C) in patients with early and intermediate nonexudative AMD and healthy subjects using OCT-A. Methods: Eighty-nine patients with nonexudative AMD (n = 89 eyes) were enrolled in the study. They were compared with sex- and age-matched control group of 66 healthy subjects (n = 66 eyes). The patients with nonexudative AMD were divided into 2 subgroups—early AMD (n = 42 eyes) and intermediate AMD (n = 47 eyes). All participants underwent OCT-A (3 × 3 mm scans, Cirrus HD-OCT, Angioplex, Carl Zeiss Meditec, Dublin, CA). Results: There was no statistically significant difference in all 3 assessed indexes between the early AMD subgroup and the control group (A ? P = 0.139;Pm ? P = 0.230;and C ? P = 0.191). There was also no statistically significant difference in all 3 assessed indexes between the intermediate AMD subgroup and the control group (A ? P = 0.106, Pm ? P = 0.124, and C ? P = 0.102, respectively). Conclusions: According to our results from the assessment of FAZ in patients with early and intermediate AMD, we hypothesize that macular perfusion remains fairly unchanged in the nonexudative stages of the disease. OCT-A is a reliable technique for visualizing and quantifying FAZ in patients with nonexudative AMD.

Determination of the Metastable Zone Width, Nucleation Kinetics, Structural and Optical Properties of KCl Doped KAP Crystal

Slow evaporation method was used to grow pure and KCl (10 mol%) doped KAP single crystal. The solubility and metastable zone width of aqueous solutions of pure and KCl (10 mol%) doped KAP crystal were evaluated to analyze the crystallization process. Measuring the induction period τ, the critical nucleation parameters like interfacial energy (σ), energy of formation of the critical nucleus (&#916G*) were determined using the classical theory of nucleation. The structural properties and optical constants of the grown crystals have been put to test and observed that the addition of KCl results in an enhancement of properties of the crystal. Grown crystals were characterized by powder X-ray diffraction. FTIR spectra confirmed the presence of KCl in pure KAP crystal. UV- Visible spectroscopic studies revealed that addition of KCl in pure KAP crystal increased transparency from 75% to 80%. The analysis of the optical absorption data revealed the presence of both indirect and direct transitions and both of these band gaps increased with the addition of KCl. The transmittance data was analyzed to calculate the refractive index, oscillator energy, dispersion energy, electric susceptibility, zero-frequency dielectric constant and both the real and imaginary parts of the dielectric permittivity as a function of photon energy. The moments of ε(E) were also determined. The dispersion i.e. spectral dependence of the refractive index was discussed according to the single-effective oscillator model proposed by Wemple and DiDomenico.

不同程度近视患者行SMILE术后的有效光学区及角膜高阶像差比较

目的:比较低、中、高度近视患者行飞秒激光小切口基质透镜取出术(SMILE)后的有效光学区和角膜高阶像差。方法:收集2019-02/2021-02在我院行SMILE手术的患者134例,均取右眼入组,按等效球镜度(SE)分为低度近视组SE>-3.00 D,中度近视组-6.00 D<SE≤-3.00 D,高度近视组SE≤-6.00 D三组,分别于术前和术后1 mo行Pentacam检查,分析各组内手术前后角膜总高阶像差(tHOA)、球差、彗差有无差异,及术后三组间角膜总高阶像差、球差、彗差及有效光学区大小(EOZ)有无差异。结果:SMILE术后1 mo,三组术后有效光学区均小于预设光学区,随着屈光度数增加,有效光学区越小(P<0.05);术后1 mo角膜总高阶像差、球差、彗差均高于术前,除低近视度组球差术前与术后1 mo无差异(P>0.05),其余组别均有差异(P<0.05);角膜总高阶像差、球差和彗差随着屈光度数增加而增加,三组角膜总高阶像差和球差有差异(均P<0.05),高度近视组与中度近视组、低度近视组彗差结果均有差异(P<0.05),中度近视组与低度近视组彗差结果无差异(P>0.05)。结论:随着手术矫正的屈光度数增加,术后有效光学区减少越多,角膜高阶像差增加越明显;SMILE术后1 mo角膜高阶像差较术前增加。

不同后光学区直径角膜塑形镜控制近视效果的Meta分析

目的 系统评价近视患者配戴不同后光学区直径角膜塑形镜后眼轴长度及治疗区直径的变化。方法 计算机检索PubMed、Embase、the Cochrane Library、Web of Science、万方医学网和中国知网(CNKI)等数据库,文种限中英文,收集配戴不同后光学区直径角膜塑形镜的随机对照试验或对照试验。由2位研究员经过文献筛选和相关数据资料的提取及方法学质量评价之后,使用RevMan 5.3软件进行Meta分析。所纳入研究均以配戴常规后光学区直径的角膜塑形镜为对照组,配戴后光学区直径减小的角膜塑形镜为试验组。结果 最终纳入8篇文献,共437例459眼近视患者。Meta分析结果显示,配戴角膜塑形镜6个月及12个月后,试验组眼轴长度变化均明显小于对照组(6个月:MD=-0.09,95%CI:-0.10~-0.07,Z=10.50,P<0.05;12个月:MD=-0.11,95%CI:-0.13~-0.09,Z=12.19,P<0.05);试验组和对照组在配戴角膜塑形镜后不同时间点测定的治疗区直径大小变化差异具有统计学意义(MD=-0.82,95%CI:-1.04~-0.59,Z=7.03,P<0.05)。结论 后光学区直径减小的角膜塑形镜能够有效延缓近视患者眼轴长度的增长,但长期疗效仍需进一步研究证实。

大功率半导体激光器端面特性改善的研究

针对大电流下前腔面不稳定导致出现灾变性光学损伤(COMD)的问题,提出一种双区电极的半导体激光器,并对该结构激光器的COMD阈值、峰值功率、阈值电流、光谱稳定性及翘曲效应进行研究。在相同工艺条件下测试了单一电极结构和双区电极结构半导体激光器的COMD阈值、峰值功率、阈值电流、波长红移速度等参数。结果表明:在同等工艺条件下,主增益区阈值电流为80 mA,阈值电流降低20%,在窗口区15 mA电流的驱动下,双区电极的半导体激光器对比单电极半导体激光器COMD阈值能够提高13%、峰值功率能够提高12%,同时减少了波长红移并改善了翘曲效应。

基于OCTA测量黄斑中心凹无血管区形态在眼部疾病中的应用研究进展

黄斑中心凹无血管区(FAZ)是视网膜上视觉最敏锐的区域,由视网膜黄斑区毛细血管丛相互连接而成,其形态可以间接反映黄斑区微循环的变化。光学相干断层扫描血管成像(OCTA)技术可以无创的可视化和量化FAZ区域,且具有较好的重复性和可靠性,OCTA展现出的巨大价值使其成为眼科及各个领域重要的辅助检查工具。在高度近视、糖尿病视网膜病变、青光眼等眼科疾病中,FAZ的面积及周长已被证实具有临床诊断价值,近年来FAZ的几何形态也展现出一定的临床意义,圆度指数、非圆指数、轴比等描述FAZ几何形态的参数为疾病研究提供了新视角。全方面研究FAZ区域的形态特征有助于探索眼部疾病发生和发展机制,或可预测疾病的早期变化及精确病理分期,为监测疾病进展及评估患者的视觉预后提供理论依据。

采动影响下底板岩体及巷道破坏时空演化特征分析

明确工作面底板采动应力分布规律,实现采动影响下底板岩体及巷道破坏程度的精准把握,能有效防止底板巷道的变形失稳。为此,根据极限平衡理论,构建煤岩体超前采动应力力学模型,获得支承压力扰动阶段和采空区卸压阶段底板岩体的力学分布规律,并基于压剪破坏准则及岩体卸荷损伤机制,得到底板岩体及巷道围岩破坏时空演化特征,进一步采用数值模拟进行可靠性验证。结果表明:采高增大,工作面前方煤体塑性区范围增大,超前支承压力集中系数减小;超前采动支承压力越大,底板岩体内主应力差越小,莫尔应力圆半径小,对底板的影响强度减弱,具体表现为底板岩体压剪破坏深度的减小;卸荷后底板岩体受力状态相同,岩体卸荷起点的增大,卸荷量增加,卸荷张拉破坏加剧,底板岩体塑性区呈“马鞍形”;推进过程中巷道围岩塑性区发生由“椭圆形”−“蝶形”−“竖直椭圆形”时空演化特征,采动支承应力越大,巷道破坏越严重,破坏主要集中在顶板及肩角位置。设计初采高度为3.5 m,通过布设光纤测试系统,得到采动过程中底板岩体及巷道随工作面推进变形与破坏的时空演化规律,测得底板岩体破坏深度最大为16.7 m,巷道围岩破坏深度最大为5.2 m,巷道围岩体在整个监测期间内保持稳定,没有发生破坏性影响,满足生产安全需求。

20例水通道蛋白4抗体阳性的中枢神经系统脱髓鞘疾病特点分析

目的 探讨水通道蛋白4抗体(AQP4-Ab)阳性的中枢神经系统脱髓鞘疾病患者的临床特点。方法 回顾分析20例住院患者的临床资料,结合临床表现、实验室结果和核磁诊断进行分析。结果 6例符合视神经脊髓炎诊断,13例符合视神经脊髓炎谱系疾病诊断,1例仅有颅内典型病灶。首次发病累及脊髓、视神经和脑干。多数病人合并自身免疫性抗体阳性。结论 AQP4-Ab是视神经脊髓炎、视神经脊髓炎谱系疾病特异性抗体;完善免疫相关指标、脑脊液、脑脊髓MRI检查有助于早期诊断该类疾病;少数AQP4-Ab阳性患者影像学可表现为孤立颅内典型部位病变。

OCTA评估黄斑中心凹无血管区参数对早期糖尿病视网膜病变的诊断价值

目的:分析光学相干断层扫描血管成像(OCTA)评估黄斑中心凹无血管区(FAZ)参数对早期糖尿病视网膜病变(DR)的诊断价值。方法:回顾性研究。选择2019-06/2022-12我院收治的2型糖尿病(T2DM)合并糖尿病视网膜病变(DR)患者209例209眼为DR组,根据分期分为DR轻度组患者115例115眼、DR中度组患者54例54眼、DR重度组患者40例40眼,单纯T2DM未合并DR患者100例100眼为No-DR组,选择同期体检健康人群70例70眼为对照组。所有受检者均行OCTA检查,DR组根据病变程度入组(若双眼病变程度一致,则随机取一眼进行研究),对照组和No-DR组随机一眼纳入研究。比较各组受检者黄斑中心凹无血管区周长(PERIM)、FAZ横径、FAZ竖径、FAZ面积、黄斑中心凹视网膜厚度(MFRT)、非圆度指数(AI)、FAZ周围300μm范围内全层视网膜血流密度(FD-300)、FAZ血管线性密度(VD)变化情况,采用Pearson相关性分析一般资料与FAZ相关指标的相关性,采用受试者工作特征(ROC)曲线评估黄斑FAZ指标诊断DR的价值。结果:DR轻度组、DR中度组、DR重度组患者FBG、MFRT、FAZ面积、PERIM水平均明显高于No-DR组和对照组,AI、VD水平明显低于No-DR组(均P<0.05);No-DR组、DR轻度组、DR中度组、DR重度组患者Cys-C、FAZ横径、FAZ竖径明显高于对照组,FD-300血流密度明显低于对照组(均P<0.05);MFRT与年龄呈正相关(r=0.295,P=0.001);AI、VD与年龄呈负相关(r=-0.296、-0.235,均P<0.05);MFRT、FAZ面积、PERIM、AI、VD诊断DR的曲线下面积(AUC)分别为0.745、0.738、0.696、0.792、0.847。结论:DM患者可出现FAZ结构及微循环改变,FAZ相关参数在诊断早期DR方面具有一定价值。

Crystal growth,structure and optical properties of Pr^(3+)-doped yttria-stabilized zirconia single crystals

The development of blue semiconductor light-emitting diodes(LEDs)has produced potential applications for Prdoped materials that can absorb blue light,especially crystals,and we now report structure and optical properties for high-quality Pr-doped single crystals of yttria-stabilized zirconia(YSZ)grown by the optical floating zone(FZ)method.X-ray diffraction(XRD)and Raman spectroscopy showed that all of the single crystal samples were in the cubic phase,whereas the corresponding ceramic samples contained a mixture of monoclinic and cubic phases.X-ray photoelectron spectroscopy(XPS)and electron paramagnetic resonance(EPR)spectroscopy showed that Pr was present as the Pr^(3+)ion in ceramic rods and single crystals after heating to high temperatures.The absorption and photoluminescence excitation(PLE)spectra of the Pr-doped YSZ crystals measured at room temperature showed strong absorption of blue light,while their photoluminescence(PL)spectra showed five emission peaks at 565 nm,588 nm,614 nm,638 nm,and 716 nm under450 nm excitation.The optimum luminescence properties were obtained with the crystal prepared using 0.15 mol%Pr_(6)O_(11),and those with higher concentrations showed evidence of quenching of the luminescence properties.In addition,the color purity of Pr-doped YSZ single crystal reached 98.9%in the orange–red region.

Superficial foveal avascular zone area changes before and after idiopathic epiretinal membrane surgery

To investigate the foveal morphological changes and foveal avascular zone（FAZ）area before and after epiretinal membrane（ERM）surgery.Twenty-two eyes with treatmentnaive ERM were included in this retrospective study.The central foveal thickness（CFT）and FAZ area were measured via swept-source optical coherence tomography（SS-OCT）and OCT angiography pre-and postoperatively.The unaffected fellow eyes were used as controls.The preoperative superficial FAZ area was significantly smaller in patients（0.08±0.04 mm^2）than in controls（0.33±0.09 mm^2;P〈0.001）.The postoperative superficial FAZ（0.12±0.06 mm^2）area was significantly greater than the preoperative area（P〈0.001）.The preoperative superficial FAZ area was strongly negatively correlated with CFT（P〈0.001,rho=-0.763）.ERM induced significant foveal morphological changes and reduction of the superficial FAZ area.Foveal thickness was restored and FAZ area increased postoperatively.However,the process is rather slow and the recovery is incomplete.

Phase zone photon sieve

A novel diffractive optical element, named phase zone photon sieve （PZPS）, is presented. There are three kinds of phase plates in PZPSs： PZPS1, PZPS2, and PZPS3. Each of the PZPSs has its own structure and is made on quartz substrate by etching. The three PZPSs have stronger diffraction peak intensity than a photon sieve （PS） when the margin pinhole and zone line width are kept the same. The PZPS3 can produce a smaller central diffractive spot than the ordinary PS with the same number of zones on the Fresnel zone plate. We have given the design method for and the simulation of PZPS and PS. PZPS has potential applications in optical maskless lithography.

Optical phonon behavior and magnetism of columbite Zn0.8Co0.2Nb2O6

Columbite Zn0.8Co0.2Nb2O6 crystals were grown by optical floating zone methods. The x-ray diffraction(XRD) was used to check the structure information of the grown Zn0.8Co0.2Nb2O6 crystal. The room temperature and temperature-dependent Raman spectra were tested to investigate the optical phonon behaviors of columbite Zn0.8Co0.2Nb2O6, which exhibited a temperature stable property. The magnetics properties of Zn0.8Co0.2Nb2O6, measured by a physical property measurement system(PPMS), were also presented in this work.

Characterization of focusing performance of spiral zone plates with fractal structure

We propose an efficient method of generating a vortex beam with multi-foci by using a fractal spiral zone plate(FSZP), which is designed by combining fractal structure with a spiral zone plate(SZP) in the squared radial coordinate.The theoretical analysis reveals that the number of foci that embed vortices is significantly increased as compared with that obtained by using a conventional SZP. Furthermore, the influence of topological charge on the intensity distribution in focal plane is also discussed in detail. For experimental investigation, an FSZP with topological charge p = 1 and 6.4 mm diameter is fabricated by using a photo-etching technique. The calibration indicates that the focusing performances of such a kind of zone plane(ZP) accord well with simulations, thereby providing its potential applications in multi-dimensional optical manipulation and optical imaging technology.

基于猫眼逆反射器的大范围免调试激光器

利用具有逆反射特性的光学元件构成激光器的谐振腔,能够赋予激光器大范围免调试工作的潜力.本文讨论了谐振激光自适应无线传能/通信等新兴应用对激光器免调试工作范围的要求,设计了基于猫眼逆反射器的大范围免调试激光器,采用腔内望远镜系统和复合腔结构分别拓展激光器的工作距离范围和提升激光安全性.通过对激光谐振腔的稳定性分析和对猫眼逆反射器的像差分析,明确了球差和场曲导致的猫眼离焦分别是限制免调试激光器工作距离和视场的关键因素.实验中通过优化光学设计补偿像差,实现了端面泵浦Nd:GdVO4激光器的大范围免调试运转.16.6W泵浦功率下,激光器接收端在1—5 m工作距离范围内移动和在±30°接收端视场范围内转动时输出功率保持在5 W以上,功率波动小于10%,无需重新准直调节.5 m工作距离下,在4.6°发射端视场内输出功率保持在其最大值的50%以上,对应接收端横向移动范围达到40 cm.本工作明确了猫眼腔免调试激光器的设计优化原则,为相关研究提供了实验结果参考.

一种考虑功率波动死区的光储出力研究方法

为解决光伏在并网过程中功率波动的问题,首先根据国标设置功率波动的死区限值,然后对光伏控制系统进行理论分析,并且选取测试过程中功率波动较大的光伏数据,采用自适应指数移动平均算法对其优化,最后在MATLAB中搭建仿真模型,验证光伏和储能系统能够将超出死区的功率控制在一定范围内,同时维持系统电压的稳定。

VirtualLab Fusion虚拟仿真辅助的菲涅尔波带法教学与探索

在教学实验中,由于受到衍射物加工精度和相机灵敏度的限制,常常不能明显地观察到与理论相匹配的菲涅耳衍射图样.本文先利用VirtualLab Fusion虚拟仿真平台计算出不同尺寸圆孔与圆屏在不同位置的菲涅耳衍射图样,再进一步针对特定尺寸圆孔与圆屏分别进行了光学实验、仿真计算以及理论预测,并对结果进行了对比分析,这将有助于增强教学效果.

玻璃体积血患者玻璃体切割术中黄斑区微结构形态与术后早期视力的关系

目的探究玻璃体积血患者玻璃体切割术中黄斑区微结构形态与术后早期(1个月内)视力的关系。方法回顾性病例系列研究。纳入郑州大学第一附属医院眼科2021年12月至2022年8月因玻璃体积血行玻璃体切割术的患者40例42眼。术中均获得患者清晰的黄斑区OCT图像,用于分析黄斑中心凹厚度(CFT)、感光细胞层中椭圆体带(EZ)连续性与术后早期最佳矫正视力(BCVA)的关系。按照EZ连续性结构划分为EZ连续组18例19眼(A组)、EZ断裂组11例12眼(B组)和EZ消失组11例11眼(C组),对三组患者间的性别、年龄、术中CFT、术前及术后早期BCVA进行比较。亚组分析:排除包含黄斑囊样水肿、黄斑前膜、神经纤维层萎缩、板层及全层黄斑孔的黄斑病变患者12例13眼,将剩余的28例29眼患者按照术后早期BCVA的恢复程度进行分组,即术后早期BCVA(logMAR)≤0.3为预后较好组(9例10眼),术后早期BCVA(logMAR)>0.3为预后较差组(19例19眼),对两组患者间的性别、年龄、术中CFT、术前BCVA及术中EZ连续性异常的发生率进行比较。结果A组、B组、C组患者间性别、年龄、术前BCVA、术中CFT差异均无统计学意义(均为P>0.05)。A组、B组、C组患者术后早期BCVA差异有统计学意义(P<0.05),两两比较结果显示,A组患者术后早期BCVA优于B组和C组(均为P<0.05),B组患者术后早期BCVA优于C组(P<0.05)。亚组分析中,预后较好组与预后较差组患者性别、术前BCVA、术中CFT差异均无统计学意义(均为P>0.05)。两组患者年龄差异有统计学意义(P<0.05);两组患者术中EZ连续性异常的发生率差异有统计学意义(P<0.05),即术后早期视力恢复较好组患者术中EZ连续性异常的发生率明显低于术后早期视力恢复较差组。结论术中以感光细胞层EZ的连续性为依据,预测玻璃体积血患者术后早期视力是可行的。