目的:评价前囊抛光对白内障超声乳化术后视觉质量的影响。方法:前瞻性随机对照研究。纳入2021-11/2022-06于应急总医院眼科行白内障超声乳化联合人工晶状体(IOL)植入术的年龄相关性白内障患者65例73眼,随机分为抛光组(30例35眼,术中行...目的:评价前囊抛光对白内障超声乳化术后视觉质量的影响。方法:前瞻性随机对照研究。纳入2021-11/2022-06于应急总医院眼科行白内障超声乳化联合人工晶状体(IOL)植入术的年龄相关性白内障患者65例73眼,随机分为抛光组(30例35眼,术中行前后囊联合抛光)和对照组(35例38眼,术中仅行后囊抛光)。观察术后1wk,1、3、6mo最佳矫正视力,术后3、6mo测量前囊口面积,并使用Pentacam三维眼前节系统评估后囊膜混浊程度(P评分)、IOL倾斜度和偏心量,使用OPD-ScanⅢ光程差分析系统评估波前像差、点扩散函数(PSF)的斯特列尔比(SR)和调制传递函数(MTF)。结果:术后1wk,1、3、6mo,抛光组患者最佳矫正视力均优于对照组(P<0.05)。术后3、6mo,两组患者前囊口面积、后囊膜混浊程度(P评分)、IOL偏心量、PSF的SR值和MTF均无差异(P>0.05)。术后3mo,两组患者IOL倾斜度、波前像差均无差异(P>0.05),但术后6mo,抛光组IOL倾斜度小于对照组[(1.65±0.60)°vs(2.34±0.43)°,P<0.001)],波前像差也小于对照组(0.03±0.01μm vs 0.06±0.03μm,P<0.001)。结论:白内障超声乳化吸除术中行360°抛光前后囊膜能提高术后最佳矫正视力,且术后IOL倾斜度更低、波前像差更小,视觉质量更好。展开更多
Terahertz(THz) waves have shown a broad prospect in the analysis of some dielectric materials because of their special properties. For the ultrafast irreversible processes, the THz single-shot measurement is a good ch...Terahertz(THz) waves have shown a broad prospect in the analysis of some dielectric materials because of their special properties. For the ultrafast irreversible processes, the THz single-shot measurement is a good choice. In this paper,a single-shot system is investigated, where a pump beam is used to generate THz pulses with high electrical field by optical rectification in LiNbO3, the probe beam with wavefront tilted by a blazed grating is used for single-shot measurement. The time window is up to 90 ps, the signal to noise ratio is 2000 : 1, the spectrum covers from 0.1 THz to about 2.0 THz, and the spectral resolution is 0.011 THz. The single-shot measurement result agrees well with that of a traditional electrical-optic sampling method.展开更多
文摘目的:评价前囊抛光对白内障超声乳化术后视觉质量的影响。方法:前瞻性随机对照研究。纳入2021-11/2022-06于应急总医院眼科行白内障超声乳化联合人工晶状体(IOL)植入术的年龄相关性白内障患者65例73眼,随机分为抛光组(30例35眼,术中行前后囊联合抛光)和对照组(35例38眼,术中仅行后囊抛光)。观察术后1wk,1、3、6mo最佳矫正视力,术后3、6mo测量前囊口面积,并使用Pentacam三维眼前节系统评估后囊膜混浊程度(P评分)、IOL倾斜度和偏心量,使用OPD-ScanⅢ光程差分析系统评估波前像差、点扩散函数(PSF)的斯特列尔比(SR)和调制传递函数(MTF)。结果:术后1wk,1、3、6mo,抛光组患者最佳矫正视力均优于对照组(P<0.05)。术后3、6mo,两组患者前囊口面积、后囊膜混浊程度(P评分)、IOL偏心量、PSF的SR值和MTF均无差异(P>0.05)。术后3mo,两组患者IOL倾斜度、波前像差均无差异(P>0.05),但术后6mo,抛光组IOL倾斜度小于对照组[(1.65±0.60)°vs(2.34±0.43)°,P<0.001)],波前像差也小于对照组(0.03±0.01μm vs 0.06±0.03μm,P<0.001)。结论:白内障超声乳化吸除术中行360°抛光前后囊膜能提高术后最佳矫正视力,且术后IOL倾斜度更低、波前像差更小,视觉质量更好。
基金Project supported by the National Natural Science Foundation of China(Grant Nos.61427814 and 61575161)the National Key Research and Development Program of China(Grant No.2017YFA0701005)the Natural Science Foundation of Shaanxi Province,China(Grant No.2019JZ-04)。
文摘Terahertz(THz) waves have shown a broad prospect in the analysis of some dielectric materials because of their special properties. For the ultrafast irreversible processes, the THz single-shot measurement is a good choice. In this paper,a single-shot system is investigated, where a pump beam is used to generate THz pulses with high electrical field by optical rectification in LiNbO3, the probe beam with wavefront tilted by a blazed grating is used for single-shot measurement. The time window is up to 90 ps, the signal to noise ratio is 2000 : 1, the spectrum covers from 0.1 THz to about 2.0 THz, and the spectral resolution is 0.011 THz. The single-shot measurement result agrees well with that of a traditional electrical-optic sampling method.
