Kappelhof J P, Vrensen G F, Vester C A, Pameyer J H, de Jong P T, Willekens B L
Graefes Arch Clin Exp Ophthalmol. 1985;223(3):111-20. doi: 10.1007/BF02148886.
The scanning ultrastructure of the remnants of the lens left in the eye after extracapsular lens extraction was investigated in the rabbit. Extracapsular lens extraction was performed in 25 eyes and the development of after-cataract followed by biomicroscopic examination. After survival times varying between 1 week and 12 months, the eyes were enucleated and the rings of Soemmerring treated for light microscopy and transmission and scanning electron microscopy. Soemmerring's ring consisted of the fused remnants of the dissected anterior and posterior lens capsule, enclosing the equatorial part of the former lens, left behind after the operation. The anterior capsule and, to a lesser extent, also the posterior capsule were multilayered and appeared to be thickened. While the remnant of the anterior capsule was lined by a monolayer of epithelial cells, the posterior part of the capsule was only partly lined by irregularly arranged epithelial cells. All epithelial cells were highly vacuolized. In transection the interior part of the ring consisted of normal fibers, irregularly oriented and irregularly shaped fibers, degenerated fibers, and globular amorphous masses. Many of the normal fibers contained cell nuclei. At the equator and at the posterior side of the fusing anterior and posterior capsule as well, the fiber organization resembled the lens bow region of normal lenses. Frequently, islands of epithelial cells were observed in the center of the ring. The vitreal face of the posterior capsule in the center of the ring (in the optic axis of the eye) seemed to be unchanged and on its pupillary surface, fibers of different size as well as fibroblastlike cells were found. However, clear-cut Elschnig's pearls were absent. Our results are compared with the observations summarized in the literature. It can be concluded that the epithelial cells in Soemmerring's ring retain their capacity for division and differentiation. The newly formed fibers seem to be pushed to the center of the ring and to degenerate.
对兔眼囊外晶状体摘除术后眼内残留晶状体的扫描超微结构进行了研究。对25只眼进行了囊外晶状体摘除，并通过生物显微镜检查观察后发性白内障的发展情况。在存活1周-12个月不等的时间后，摘除眼球，将索默林环进行处理以用于光学显微镜、透射电子显微镜和扫描电子显微镜检查。索默林环由分离的晶状体前、后囊膜的融合残余物组成，包绕手术后遗留在眼内的原晶状体赤道部。前囊膜，以及程度较轻的后囊膜，均为多层结构且似乎增厚。前囊膜残余物内衬单层上皮细胞，而后囊膜后部仅部分内衬排列不规则的上皮细胞。所有上皮细胞均高度空泡化。在横切面上，环的内部由正常纤维、方向不规则且形状不规则的纤维、变性纤维和球形无定形团块组成。许多正常纤维含有细胞核。在融合的前、后囊膜的赤道部以及后侧，纤维组织类似于正常晶状体的晶状体弓区域。在环的中央经常观察到上皮细胞岛。环中央（眼视轴处）后囊膜的玻璃体面似乎未改变，在其瞳孔表面发现了不同大小的纤维以及成纤维细胞样细胞。然而，未发现典型的Elschnig珠。将我们的结果与文献中总结的观察结果进行了比较。可以得出结论，索默林环中的上皮细胞保留了其分裂和分化能力。新形成的纤维似乎被推向环的中央并发生变性。
