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Impact of Primary Calcification in Segmented Refractive Bifocal Intraocular Lenses on Optical Performance Including Straylight.
Journal of Refractive Surgery ( IF 2.9 ) Pub Date : 2020-01-01 , DOI: 10.3928/1081597x-20191119-01
Timur M. Yildirim , Grzegorz Labuz , Ramin Khoramnia , Hyeck-Soo Son , Sonja K. Schickhardt , Ingo Lieberwirth , Michael C. Knorz , Gerd U. Auffarth

PURPOSE To describe and analyze the impact of calcification on the optical quality of segmented refractive bifocal intraocular lenses (IOLs). METHODS Eight segmented refractive bifocal IOLs made of hydrophilic acrylic were explanted from 8 patients due to opacification (and one opacified IOL that was not explanted) and analyzed in a cross-sectional study with laboratory analysis. Nine cases comprised three IOL models: LS-313 MF30 (5 cases), LS-312 MF30 (3 cases), and LS-313 MF15 (1 case). Material analysis with scanning and transmission electron microscopy confirmed IOL calcification. Measurements of modulation transfer function (MTF) and straylight permitted assessment of the IOL optical quality. Values were compared to a control lens. RESULTS Except for one case of Nd:YAG (neodymium:yttrium-aluminum-garnet) capsulotomy, there was no secondary surgical procedure in the patients' histories. Eight of nine patients reported deteriorated visual quality, ultimately requiring IOL exchange. Material evaluation revealed fine granules of a calcium phosphate. Despite calcification, all but one lens still showed two distinct foci on the MTF measurements. Straylight values were higher than in a cataractous lens (33.1 deg2/sr) in all cases, with an average value of 170.1 ± 71.5 deg2/sr. CONCLUSIONS Optical quality assessment showed that IOL calcification had a small effect on the MTF of segmented refractive bifocal lenses but a large impact on the straylight levels. Accordingly, in the clinical case, straylight levels were elevated. [J Refract Surg. 2020;36(1):20-27.].

中文翻译:

分段折射双焦点人工晶状体中初级钙化对光学性能(包括杂散光)的影响。

目的描述和分析钙化对分段屈光双焦点人工晶状体(IOL)光学质量的影响。方法从8例因混浊(和1例未移植的混浊IOL)患者中取出8例由亲水性丙烯酸制成的分段双折射IOL,并在横断面研究中进行实验室分析。9个案例包括三个IOL模型:LS-313 MF30(5个案例),LS-312 MF30(3个案例)和LS-313 MF15(1个案例)。用扫描和透射电子显微镜进行的材料分析证实了IOL钙化。测量调制传递函数(MTF)和杂散光可以评估IOL光学质量。将值与对照镜片进行比较。结果除一例Nd:YAG(钕:钇铝石榴石)囊切开术外,患者的病史中没有进行二次手术。9名患者中有8名报告视力下降,最终需要更换IOL。材料评估显示磷酸钙细颗粒。尽管有钙化,但除一个晶状体外,其他所有晶状体在MTF测量中仍显示出两个不同的病灶。在所有情况下,杂散光值均高于白内障晶状体(33.1 deg2 / sr),平均值为170.1±71.5 deg2 / sr。结论光学质量评估显示,IOL钙化对分段屈光双焦点镜片的MTF影响较小,但对杂散光水平的影响较大。因此,在临床情况下,杂散光水平升高。[J Refract Surg。2020; 36(1):20-27。]。9名患者中有8名报告视力下降,最终需要更换IOL。材料评估显示磷酸钙细颗粒。尽管有钙化,但除一个晶状体外,其他所有晶状体在MTF测量中仍显示出两个不同的病灶。在所有情况下,杂散光值均高于白内障晶状体(33.1 deg2 / sr),平均值为170.1±71.5 deg2 / sr。结论光学质量评估表明,IOL钙化对分段折射双焦点镜片的MTF影响较小,但对杂散光水平影响较大。因此,在临床情况下,杂散光水平升高。[J Refract Surg。2020; 36(1):20-27。]。9名患者中有8名报告视力下降,最终需要更换IOL。材料评估显示磷酸钙细颗粒。尽管有钙化,但除一个晶状体外,其他所有晶状体在MTF测量中仍显示出两个不同的病灶。在所有情况下,杂散光值均高于白内障晶状体(33.1 deg2 / sr),平均值为170.1±71.5 deg2 / sr。结论光学质量评估显示,IOL钙化对分段折射双焦点镜片的MTF影响较小,但对杂散光水平的影响较大。因此,在临床情况下,杂散光水平升高。[J Refract Surg。2020; 36(1):20-27。]。除了一个镜片外,所有其他镜片在MTF测量中仍显示出两个不同的焦点。在所有情况下,杂散光值均高于白内障晶状体(33.1 deg2 / sr),平均值为170.1±71.5 deg2 / sr。结论光学质量评估显示,IOL钙化对分段折射双焦点镜片的MTF影响较小,但对杂散光水平的影响较大。因此,在临床情况下,杂散光水平升高。[J Refract Surg。2020; 36(1):20-27。]。除了一个镜片外,所有其他镜片在MTF测量中仍显示出两个不同的焦点。在所有情况下,杂散光值均高于白内障晶状体(33.1 deg2 / sr),平均值为170.1±71.5 deg2 / sr。结论光学质量评估显示,IOL钙化对分段折射双焦点镜片的MTF影响较小,但对杂散光水平的影响较大。因此,在临床情况下,杂散光水平升高。[J Refract Surg。2020; 36(1):20-27。]。在临床情况下,杂散光水平升高。[J Refract Surg。2020; 36(1):20-27。]。在临床情况下,杂散光水平升高。[J Refract Surg。2020; 36(1):20-27。]。
更新日期:2020-01-15
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