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角膜屈光手术后圆锥角膜的临床分析 总被引:3,自引:2,他引:3
目的 :研究角膜屈光手术后出现的圆锥角膜的特性 ,探讨圆锥角膜发生的可能机制 ,为临床提供有价值的建议 ,并评价硬性透氧性角膜接触镜 (RGP)在术后圆锥角膜中的治疗作用。方法 :对角膜屈光手术后出现角膜膨出的 11例 18眼患者做常规裂隙灯检查、主客观验光、角膜曲率测定、角膜厚度检测和角膜地形图检查 ,并根据角膜曲率特征选择试戴镜片 ,以荧光素图判断配适情况 ,选择镜片 ,并作片上验光。结果 :11例 18眼患者 ,术前屈光度 :球镜平均为 (-8.6 9± - 0 .94 )DS ,柱镜度数平均为 (- 1.2 8± - 0 .5 4 )DC。其中 14眼出现圆锥角膜为LASIK术后 ,2眼为PRK后 ,2眼为RK术后。表现圆锥角膜特征的时间在术后 2~ 12个月 ,平均为 (7.4 1± 3.95 )个月。圆锥的位置 :角膜正中 9眼 ,角膜正中上方 1眼 ,颞下方 1眼 ,外围 1眼 ,正下方 4眼 ,水平蝴蝶型 2眼。RGP镜片配适满意的达 90 % ,可以接受的为10 % ;患者戴镜后的矫正视力 0 .1~ 1.0D ,平均为 (0 .72± 0 .2 3)D。结论 :角膜屈光手术后圆锥角膜往往出现在高度数近收稿日期 :2 0 0 3 -0 5 -0 3 ;修回日期 :2 0 0 3 -10 -3 0作者简介 :瞿小妹 (1965 -) ,女 ,上海人 ,医学博士 ,副主任医师 ,研究方向 :眼视光学。E -mail:quxiaomei2 0 0 2 @hotmail.com视患者中 相似文献
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圆锥角膜的角膜地形图分析 总被引:5,自引:0,他引:5
目的探讨圆锥角膜的屈光状态和角膜地形图形态分布。方法147例(262只眼)圆锥角膜,使用电脑验光和角膜曲率仪与计算机辅助的角膜地形图仪测量眼部屈光度、角膜曲率、角膜散光度、角膜表面规则指数(SRI)、表面非对称指数(SAI)及进行角膜形态学描述。结果将圆锥角膜患者分为可疑、轻度、中度及重度。病灶形态分为蝶形和非蝶形。蝶形又分为对称和不对称;非蝶形又分为乳头状、卵圆形、球形及不规则形。蝶形病变,以对称蝶形多见,常见于可疑和轻度病例。乳头状和卵圆形,多见于轻、中度病例,多位于角膜中央或中央偏下方;球形多见于中、重度病例,多位于角膜中央;不规则形见于重度病例。多数患者双眼病灶间存在对称性。病变直径与角膜顶点屈光度间无相关性(r=0.208,P=0.092),病变顶点距中心距离与顶点屈光度间呈负相关(r=-0.400。P=0.001)。结论利用角膜地形图,可筛查和早期诊断圆锥角膜,有助于采取及时适当的治疗,避免对圆锥角膜患者进行准分子激光角膜屈光手术;同时了解病变在角膜上的分布规律,可指导硬性角膜接触镜的验配. 相似文献
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以放射状角膜切开术治疗13例圆锥角膜患者。术后近期内患者视力均得到较大改善。提示放射状角膜切开术治疗早期圆锥角膜有一定效果,但远期疗效有待进一步随访。 相似文献
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圆锥角膜的角膜地形图改变 总被引:7,自引:0,他引:7
采用计算机辅助的角膜地形图检查仪对4(6只眼)圆锥角膜进行研究,并与18例正常眼进行对比,发现圆锥角膜中央屈光度大,同一个体双眼角膜中央屈光度差值大,下方角膜变陡。以上可能为圆锥角膜的角膜地形图学特点。 相似文献
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Morphological changes in keratoconus: pathology or pathogenesis 总被引:1,自引:0,他引:1
Keratoconus was first discriminated from other corneal ectatic diseases in 1854. Since that time the morphological characteristics of keratoconic progression have been invaluable in the diagnosis of the condition. The key clinical features used to identify keratoconus have remained essentially the same since the introduction of the slit-lamp biomicroscope. Only relatively recently has the development of computerized corneal topography revolutionized the diagnosis of early keratoconus. Analysis of peer-reviewed literature databases revealed a steady chronological increase in pathological research into the progress of keratoconus. This overview describes the recent advances in our understanding of keratoconic pathology and highlights the interactions within the cornea that may be important in the pathogenesis of this condition. 相似文献
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Orhan Ayar Mehmet Cuneyt Ozmen Orkun Muftuoglu Mehmet Orcun Akdemir Mustafa Ko Kemal Ozulken 《国际眼科》2015,8(6):1141-1145
AIM: To evaluate and compare corneal biomechanical findings measured by ocular response analyzer, topographic and pachymetric findings in patients with unilateral keratoconus patients and healthy controls.
METHODS: This is an observational, case-control study. Patients with keratoconus in one eye and forme fruste keratoconus in the fellow eye were compared with sex and age matched with controls healthy subjects. All subjects were evaluated with rotating scheimpflug imaging system. The receiver-operating-characteristic curves were analyzed to evaluate the sensitivity and specificity of the parameters.
RESULTS: Twenty-seven patients with keratoconus in one eye and forme fruste keratoconus in the fellow eye were compared with 40 eyes of 40 normal subjects. Corneal hysteresis (CH) was 8.0±1.7 mm Hg in keratoconus group, 8.3±1.6 mm Hg in forme fruste keratoconus group, and 9.8±1.6 mm Hg in control groups (P=0.54 between keratoconus and forme fruste keratoconus groups, P<0.01 between control group and other groups). Corneal resistance factor (CRF) was 7.1±2.2 mm Hg in keratoconus group, 7.8±1.2 mm Hg in forme fruste keratoconus group and 9.9±1.5 mm Hg in control group (P<0.001 between control group and other groups). Using receiver-operating-characteristic analysis, the area under curve values of the parameters to distinguish forme fruste keratoconus from control subjects were: CH (0.768), CRF (0.866). Best cut-off points were 9.3 mm Hg and 8.8 mm Hg for CH and CRF respectively.
CONCLUSION: Ocular response analyzer parameters (CH and CRF) are found to be significantly lower in forme fruste keratoconus patients compared to normal control subjects. 相似文献
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准分子激光原位角膜磨削术后继发圆锥角膜病因分析 总被引:1,自引:0,他引:1
目的 对4眼准分子激光原位角膜磨削术(LASIK)后继发圆锥角膜进行病因分析。方法 为4眼重度近视患者行常规LASIK治疗,术后角膜地形图分析确诊圆锥角膜,对手术前皇检查的各项数值行回顾性分析。结果 4眼LASIK术后患者激光切削后剩余角膜基质厚度均大于200um,眼压正常,术后7个月~1年半发生圆锥角膜,其中1眼行穿透性角膜移植术获得满意疗效。结论 虽然LASIK术后保留角膜常规厚度,眼压正常, 相似文献
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圆锥角膜(keratoconus)是一种常见的非炎症性、慢性、进展性、角膜局部扩张性疾病,以中央或旁中央角膜基质变薄、中央顶点呈圆锥形突出变形,角膜失去正常的弧形,产生不规则散光和形成瘢痕为特征。圆锥角膜的病因至今尚未明确,有一定家族遗传倾向,同时发现其与胶原发育障碍、内分泌与细胞代谢紊乱、免疫缺陷等有关,也可能是多因素发病机制。随着角膜屈光手术治疗的广泛开展,圆锥角膜的早期诊断,意义深远。熟练掌握圆锥角膜临床特点及常用诊断标准,尤其是早期诊断,术前准确筛查圆锥角膜,对于开展角膜屈光手术工作、有效防治手术并发症至关重要。我们就圆锥角膜的临床特点和目前所采用的诊治方法进行综述。 相似文献
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Frozen section diagnosis can afford the opportunity for histopathological examination of excised tissues in the operating room. Because frozen section techniques have traditionally been little used in ophthalmic surgery, many pathologists are not familiar with eye tissues. However, with cooperation and understanding between the ophthalmologist and the pathologist, frozen section diagnosis may be able to identify the tissue, the pathologic process and the extent of the lesion within 10-15 minutes. In this review, applications and problems of frozen section diagnosis in various types of ocular surgery are discussed. 相似文献
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