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find Keyword "视网膜疾病" 345 results
  • The variability of parameters of multi-focal electroretinogram

    Objective To evaluate the variability of four parameters of multi-focal electroretinogram (mERG) a-wave amplitude, b-wave amplitude, awave latent period, b-wave latent period. Methods Sixty normal eyes of 46 volunteers were divided into 3 groups of different ages. RETIscan 3-12 system was used to carry out mERG examination. The stimulus matrix of 61 hexagonal elements spanning the central 24deg;of the visual field. These hexons were scaled with eccentricity and divide d into 5 rings. First-order kernel was selected. Results The variability of four parameters of mERG was great. The variability of b-wave latent period was the smallest, its coefficient of variatian was 4.52%~15.62%;that of a-wave latent period held the second place:10.29%~48.67%;that of b-wave amplitude was greater:25.92%~76.11%;that of a-wave amplitude was the greatest:43.82%~88.23%. The results of three groups showed that b-wave amplitude of ring 1 had the smallest variability. Conclusions The variability of latent period is smaller than that of amplitude; the variability of b-wave was smaller than that of a-wave. The longer the centrifugal distance, the lower the amplitude density of a-wave and b-wave. Physiological and anatomical factors might be important for the variability of parameters of multi-focal electroretinogram. (Chin J Ocul Fundus Dis, 2001,17:277-279)

    Release date:2016-09-02 06:03 Export PDF Favorites Scan
  • 远距离损伤引起的Purtscher视网膜病变一例

    Release date:2016-09-02 06:12 Export PDF Favorites Scan
  • Advances of stem cell transplantation in the treatment of retinal degeneration

    Retinal degeneration mainly include age-related macular degeneration, retinitispigmentosa and Stargardt’s disease. Although its expression is slightly different, its pathogenesis is photoreceptor cells and/or retinal pigment epithelial (RPE) cel1 damage or degeneration. Because of the 1ack of self-repairing and renewal of retinal photoreceptor cells and RPE cells, cell replacement therapy is one of the most effective methods for treating such diseases.The stem cells currently used for the treatment of retinal degeneration include embryonicstem cells (ESC) and various adult stem cells, such as retinal stem cells (RSC), induced pluripotent stem cells (iPSC). and mesenchyma1 stem cells (MSC). Understanding the currentbasic and clinical application progress of ESC, iPSC, RSC, MSC can provide a new idea for the treatment of retinal degeneration.

    Release date:2018-11-16 03:02 Export PDF Favorites Scan
  • 玻璃体视网膜交界面疾病发病因素的研究进展

    玻璃体视网膜交界面(VRI)疾病是由于VRI病理改变而引起的年龄相关性退行性改变,主要由异常玻璃体后脱离(PVD)导致的玻璃体对视网膜的牵拉而引起,可严重影响患者视功能。目前已发现年龄增长引起的玻璃体视网膜黏附力减弱,加上玻璃体胶质的不稳定性伴随玻璃体液化可共同导致PVD的发生。PVD与雌激素水平相关。女性玻璃体内透明质酸聚集度较低可能是其易发PVD的一个原因。高血糖、高血脂及高血压等全身疾病也是VRI疾病发生的危险因素。此外,高度近视、脉络膜厚度与血液供应的改变也可能是促进VRI疾病发生发展的重要原因。深入了解和探讨这些危险因素在VRI疾病中的作用及可能机制,有助于指导临床识别和筛查高危人群,为制定预防策略提供有用信息。

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  • 直肌止点注射地塞米松致视网膜动脉痉挛一例

    Release date:2016-09-02 05:58 Export PDF Favorites Scan
  • 黄斑病变手术前后黄斑区视网膜的解剖和视功能评估

    光学相干断层扫描(optical coherence tomography,OCT)是一种新的光学诊断技术,多焦视网膜电图(multifocal electroretinography, M ERG)是一种新型的视觉电生理学技术。两者对于黄斑部疾病的诊断、病情观察、疗效评价等均具有特别重要的价值。现就OCT、MERG在黄斑疾病手术前后黄斑区视网膜的解剖形态和 视功能评估方面的应用作一综述。 (中华眼底病杂志,2001,17:169-170)

    Release date:2016-09-02 06:03 Export PDF Favorites Scan
  • 色素失禁症合并单眼视网膜病变一例

    Release date:2019-05-17 04:15 Export PDF Favorites Scan
  • VITRECTOMY FOR RETINAL DETACHMENT CAUSED BY ACUTE RETINAL NECROSIS

    Abstract:Five eyes of acute retinal necrosis(ARN)with multiple retinal breaks and retinal detachment were treated by closed vetrectomy combined with encircling buckle,gas/fluid exchange,nolaser and cryotherapy.After operation,the detached retinas reattached in 4eyes,and among them th visual acuity was 0.2 in 1 eye,and better than 0.05 in 3 eyes.The follow-up duration in 5 eyes was from 6 to18 months and recurrent retinal detachment was found in one eys. (Chin J Ocul Fundus Dis,1996,12: 20-21)

    Release date:2016-09-02 06:21 Export PDF Favorites Scan
  • 程序性死亡与视网膜病变

    程序性死亡是生理或病理条件下的一种细胞主动死亡形式,对维持机体的正常发育和内环境的稳定以及在很多疾病的发生、发展及其预后中起着很重要的作用。作者对程序性死亡的特征、基因调控、影响因子及其在视网膜病变中的研究现状进行综述,并对程序性死亡在视网膜病变中的研究进行展望。 (中华眼底病杂志,1997,13:125-127)

    Release date:2016-09-02 06:12 Export PDF Favorites Scan
  • Better understanding retinal and choroidal vascular diseases with optical coherence tomography angiography

    Optical coherence tomography angiography (OCTA) is a new and non-invasive imaging technique that is able to detect blood flow signal in the retina and the choroid within seconds. OCTA is different from the traditional angiography methods. The major advantages of OCTA are that it can observe blood flow signal in different layers of the retina and the choroid without injecting any dye, provide blood flow information that traditional angiography cannot provide, and enrich pathophysiological knowledge of the retinal and choroidal vascular diseases., which help us to make an accurate diagnosis and efficient evaluation of these diseases. However there is a large upgrade potential either on OCTA technique itself or on clinical application of OCTA. We need to fully understand the advantage and disadvantage, and differences of OCTA and traditional angiography. We also need to know how to interpret the result of OCTA. With that we could make a fast diagnosis in a non-invasive way and improve our knowledge of the retinal and choroidal vascular diseases.

    Release date:2016-10-02 04:55 Export PDF Favorites Scan
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