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目的 :探讨圆锥角膜病人角膜地形图的特点 ,为早期诊断圆锥角膜提供客观依据。对角膜屈光术前病人进行严格筛选 ,提高手术的预测性。方法 :7例亚临床期圆锥角膜病人 ,2 6例 (3 8只眼 )进展期圆锥角膜的患者 ,3 0例 (60只眼 )正常眼作为对照组 ,用EyeSyssystem 2 0 0 0计算机辅助的角膜地形图仪检查。检查内容 :(1)地形图形态 ;(2 )角膜中央屈光力 ;(3 )角膜中心下方 3mm处屈光力与角膜中心上方 3mm处屈光力的差值 (I -S) ;(4 )同一个体双眼角膜中心屈光力差值。结果 :亚临床期圆锥角膜角膜下方尤其是颞下方的角膜镜影像呈梨形改变 ,变陡峭的圆锥区域均较局限。进展期圆锥角膜局部区域变陡峭 ,形成一局限性圆锥 ,为乳头状、卵圆形和球形。角膜中央屈光度、同一个体双眼角膜屈光度差值、距角膜中央3 0mmI -S值的差异有显著意义。结论 :角膜地形图仪是诊断单侧亚临床期圆锥角膜的敏感方法 ,可以指导设计角膜接触镜 ,对圆锥角膜的圆锥底进行定位 ,指导手术植孔位置及大小。
Objective: To investigate the characteristics of corneal topography in patients with keratoconus and provide an objective basis for the early diagnosis of keratoconus. Corneal refractive surgery patients before rigorous screening to improve the predictability of surgery. Methods: Seven patients with subclinical keratoconus, 26 patients with progressive keratoconus (38 eyes), and 30 normal eyes (60 eyes) were used as the control group, and were compared with EyeSyssystem 200 computer-aided Corneal topography test. (2) corneal central refractive power; (3) the difference between the refractive power at 3mm below the center of the cornea and the refractive power at 3mm above the center of the cornea (I-S); (4) the center of the cornea of the same individual Refractive error. Results: The subcortical keratoconus cornea, especially the inferior temporal cornea, showed a pear-shaped image. The steep conic regions were more limited. Progressive keratoconus local area steep, forming a limited cone, papillary, oval and spherical. Corneal central diopter, the same individual binocular corneal refractive difference, from the central corneal 30mmI-S value of the difference was significant. Conclusion: Corneal topography is a sensitive method to diagnose unilateral subclinical keratoconus. It can guide the design of contact lens, locate the conical bottom of the keratoconus, and guide the location and size of the surgical implant.