Amon M, Menapace R
I. Universität Augenklinik Wien, Vienna, Austria.
J Cataract Refract Surg. 1993 Jan;19(1):16-21. doi: 10.1016/s0886-3350(13)80273-8.
To find out how large the total diameter of an open-loop intraocular lens (IOL) should be, we studied 90 consecutive implantations of a one-piece poly(methyl methacrylate) IOL with a 7 mm biconvex optic and a total diameter of 10 mm (Adatomed 75 ST). The lens design made implantation simple, even through a small capsulorhexis. In 85% of the cases, the IOL remained well centered. One case with asymmetric placement of the IOL showed a decentration of more than 1 mm. In 14% of the eyes slight decentrations occurred because the capsular bag was too large. Contact between the iris and IOL was found in 15%. In 4% there were folds in the posterior capsule, and in 35% there was a small space between the IOL and the posterior capsule because the capsular bag was too large. Although the ST lens has a small total diameter, it remained at a distance from the iris in most cases. In-the-bag implantation through a continuous central capsulorhexis is mandatory to avoid secondary displacement; nevertheless, slight decentrations cannot be excluded. For a large capsular bag, the total diameter of an IOL should exceed 10 mm. Clinical results, cellular reaction on the lens surface (26.6%), biocompatibility, and visual performance are comparable to those of other well-approved poly(methyl methacrylate) IOLs.
为了确定开环式人工晶状体（IOL）的总直径应多大，我们研究了连续90例植入的一体式聚甲基丙烯酸甲酯IOL，其具有7mm双凸光学部且总直径为10mm（Adatomed 75 ST）。这种晶状体设计使植入变得简单，即使通过小的连续环形撕囊也可。在85%的病例中，IOL保持良好居中。1例IOL不对称放置显示偏心超过1mm。在14%的眼中，由于囊袋过大出现轻微偏心。在15%的病例中发现虹膜与IOL接触。在4%的病例中后囊有褶皱，在35%的病例中由于囊袋过大IOL与后囊之间有小间隙。尽管ST晶状体总直径较小，但在大多数情况下它与虹膜保持一定距离。通过连续中央环形撕囊进行囊袋内植入对于避免继发性移位是必需的；然而，轻微偏心仍不能排除。对于大的囊袋，IOL的总直径应超过10mm。临床结果、晶状体表面的细胞反应（26.6%）、生物相容性和视觉性能与其他经过充分验证的聚甲基丙烯酸甲酯IOL相当。
