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白内障有哪些表现及如何诊断?

来源:华人健康网 | 发布时间:2010-12-27 15:24:14 | www.chinesejk.com

双侧性但两眼发病可有先后视力进行性减退有时在光亮的背景下可以看到固定的黑点由于晶体不同部位屈光力变化可有多视单眼复视近视度增加临床上将老年性白内障分为皮质性核性和囊下三种类型:

  1皮质性白内障(cortical cataract)以晶体皮质灰白色混浊为主要特征其发展过程可分为四期:初发期未成熟期成熟期过熟期

  2核性白内障(nuclear cataract) 晶体混浊多从胚胎核开始逐渐扩展至成人核早期呈黄色随着混浊加重色泽渐加深如深黄色深棕黄色核的密度增大屈光指数增加病人常诉说老视减轻或近视增加早期周边部皮质仍为透明因此在黑暗处瞳孔散大视力增进而在强光下瞳孔缩小视力反而减退故一般不等待皮质完全混浊即行手术

  3后囊下白内障(posterior subcapsular cataract)因混浊位于视轴区早期即影响视力

(编辑:阳阳 )

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