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排序方式: 共有26条查询结果,搜索用时 15 毫秒
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AIM: To compare the regularity and accuracy of laser in situ keratomileusis (LASIK) flaps created by the Ziemer FEMTO LDV “Classic” (Ziemer “Classic”) and Ziemer FEMTO LDV Crystal Line femtosecond laser (Ziemer Crystal Line).METHODS:Fourier-domain optical coherence tomography (RTVue OCT) was used tomeasure the morphology of 200 LASIK flaps of 100 consecutive patients created with the Ziemer Classic (100 flaps) or the Ziemer Crystal Line (100 flaps) at one week postoperatively. Flap thickness was evaluated at 36 specified measurement points on each flap. For all procedures with both lasers, the nominal flap thickness was 110µm.RESULTS:The mean flap thickness of the Ziemer Crystal Line group(102.49±2.68µm) was thinner than that of the Ziemer Classic group (107.65±5.09µm) (P<0.01). Average thickness of all flaps was uniform within 4µm at all measurement points. The flaps in the Ziemer Crystal Line group were more regular than those in the Ziemer Classic group when measured from the center to the periphery. The maximum deviation from the nominal 110µm of 36 measurements was 8µm in the Ziemer Classic group, while in the Ziemer Crystal Line group it was 9µm. Within the 3 600 measurements on the 100 eyes, differences greater than 20µm were observed 0.14% in the Ziemer Classic group, and 0.04% in the Ziemer Crystal Line group.CONCLUSION:The flaps created with the Ziemer FEMTO LDV Crystal Linefemtosecond laser are more uniform and thinner than those created by the Ziemer FEMTO LDV Classic femtosecond laser.  相似文献   
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Background: The aim of this study was to assess the refractive stability and validity of automated refraction obtained at day one after surgery for dense cataracts in a developing country setting, where patient follow‐up is often erratic. Methods: In a prospective study in rural Kenya, we compared automated refraction and visual acuity (VA) after manual small incision cataract surgery (SICS) and phacoemulsification cataract surgery (Phaco) at day one with autorefraction and subjective refraction obtained at a later visit. Results: Ninety eyes of 83 patients fulfilled the ultimate inclusion criteria (21 SICS eyes and 69 Phaco eyes). The correlation between refraction at day one and at a later follow‐up was moderately good for both SICS and Phaco (R1 = 0.61 and R2 = 0.58). Spherical equivalent (SE) values measured at day one were within one dioptre of those obtained later in 68 eyes (72 per cent); (SICS: 67 per cent; Phaco: 74 per cent) and within two dioptres in 83 eyes (92 per cent); (SICS: 86 per cent; Phaco: 94 per cent). At post‐operative days 14, 28 and more than 42 for SICS and Phaco eyes, the mean SE was 0.58 and 0.48, 0.55 and 0.19, and 0.9 and 0.31 more hypermetropic than the mean SE of post‐operative day one, respectively. First‐day accuracy was higher in eyes with better pre‐operative VA, softer cataracts and lower post‐operative prediction error. The surgical technique (SICS versus Phaco) had no influence on first‐day accuracy in our set‐up. Conclusion: Refractive data from the early post‐operative period can provide useful data for qualitative control and monitoring of post‐operative refractive outcomes in a setup, where ‘better’ data are often not available; however, its accuracy is limited and, ultimately, there is no alternative to good follow up of operated patients.  相似文献   
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目的 分析上海市长宁区学龄前儿童散瞳前、后屈光度的差异, 研究在非睫状肌麻痹状态下进行大规模儿童近视眼筛查的可行性。方法 整群抽取35所区属公立幼儿园4~6岁儿童进行视力、屈光筛查, 视力低常患儿行散瞳验光, 比较各年龄组散瞳前、后屈光状态, 建立散瞳前、后等效球镜的线性回归方程, 并探讨在非睫状肌麻痹状态下近视眼筛查的最佳阳性界值。结果 各年龄组儿童散瞳前、后等效球镜差异具有统计学意义, 且存在线性相关。在非睫状肌麻痹状态下, 4岁儿童近视眼筛查的最佳阳性界值为等效球镜<-1.00D, 5~6岁儿童为等效球镜<-0.75D。结论 小瞳验光对于大规模儿童近视眼的初步筛查是有效可行的。  相似文献   
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Purpose: To evaluate common strategies for screening myopia.

Methods: A total of 2,248 children aged 6 to 12 years from five randomly selected primary schools were included for the screening. Enrolled study participants underwent distant uncorrected visual acuity (UCVA, Standard Logarithmic Visual Acuity E Chart) and non-cycloplegic auto-refraction (NCAR, Topcon KR-8800). Among them, 1,639 children (72.9%) accepted cycloplegic auto-refraction. Taking rejection of cycloplegia into account, receiver operating characteristic curves were drawn to compare the accuracies of the four strategies (I, Cycloplegic auto-refraction; II, NCAR; III, UCVA; IV, Combination of UCVA and NCAR). Decision curve analysis (DCA) was used to compare net benefits. Tenfold cross-validation was used for statistical analyses.

Results: For myopia (spherical equivalent refraction, SE ≤ ?0.5D) screening, the mean sensitivities were 73.79% (SD: 5.40%), 85.57% (6.84%), 59.71% (13.49%), and 85.06% (6.68%) for Strategy I to IV; with mean specificities of 100% (0%), 87.43% (4.27%), 89.74% (10.25%), and 88.65% (5.07%), respectively. For screening early myopia (SE ≤ ?0.5D and ≥?1.0D), the mean sensitivities were 73.44% (7.69%), 82.39% (5.32%), 54.27% (14.58%), and 81.76% (9.60%) for Strategy I to IV; with mean specificities of 100% (0%), 79.13% (4.86%), 85.48% (9.86%), and 81.17% (4.16%). Based on DCA, the net benefits of Strategy IV were the highest, with the probability thresholds ranging from 12% to 50%, after adjusting the TestHarms. For early myopia, the net benefits of Strategy IV were the highest with the probability threshold ranging from 5% to 34%.

Conclusion: Combination of UCVA and NCAR produced the highest net benefits for myopia screening.  相似文献   
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目的用强度矢量法研究小儿静态屈光不正,比较视网膜检影与自动验光仪的屈光检查结果。方法分别用视网膜检影与自动验光仪对76人152眼行静态屈光检查。将屈光不正结果表达成三维直角屈光度坐标上的点。直角屈光度坐标上的每一点坐标(X,Y,Z)对应于屈光处方的三个分解成分:等效球镜成分、Jackson交叉柱镜JO成分在90°和180°轴位上、和Jackson交叉柱镜J45成分在45°和135°轴位上。结果视网膜检影与自动验光仪的等效球镜成分高度相关(相关系数0.984,P<0.001)。视网膜检影与自动验光仪的JO成分高度相关(相关系数0.948,P<0.001)。视网膜检影与自动验光仪的J45成分高度相关(相关系数0.673,P<0.001)。视网膜检影与自动验光仪在配对t检验中,等效球镜成分的均值和标准差为(0.1050±0.5269,P=0.015),Jackson交叉柱镜JO成分的均值和标准差为(-8.91E-03±0.2272,P=0.63),Jackson交叉柱镜J45成分的均值和标准差为(-1.63E-02±0.2586,P=0.439)。结论临床上可用自动验光仪的结果代替视网膜检影法,散光部分基本不变,而在球镜上常需要一些调整。  相似文献   
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PURPOSE: To validate aberrometry-based relative peripheral refraction (RPR) measurements and to examine RPR differences in the nasal and temporal horizontal visual field. METHODS: Thirty subjects underwent cycloplegia in the right eye. Ten measurements each were made centrally, 30 degrees nasally on the retina and 30 degrees temporally on the retina using the Complete Ophthalmic Analysis System (COAS) aberrometer and the Grand Seiko WR-5100K autorefractor in random order. A 2-mm COAS analysis diameter was used to approximate the Grand Seiko autorefractor measurement beam diameter. Nasal and temporal RPR were calculated as the difference between the average nasal or temporal spherical equivalent and the average central spherical equivalent. Repeated measures ANOVAs were used to test for significant differences between the RPR readings of each instrument in each retinal location (nasal or temporal) and to examine refractive error in each direction of gaze for both instruments. RESULTS: Central spherical equivalent refractive error as measured by the Grand Seiko autorefractor ranged from +0.63 D to -8.41 D (mean +/- S.D. = -2.63 D +/- 2.05 D). There were no significant differences between the instruments for RPR measurements (p = 0.34). The nasal RPR was significantly more hyperopic than the temporal RPR (mean +/- S.D. = +0.45 D +/- 1.04 D, p = 0.02). Spherical equivalent refractive error in all directions of gaze was more myopic with the COAS than with the Grand Seiko autorefractor (mean +/- S.D. = -0.41 D +/- 0.61 D, p < 0.0001). CONCLUSIONS: RPR measurements with the COAS are feasible and equivalent to those made with the Grand Seiko autorefractor. The COAS can be used to simultaneously collect RPR and peripheral aberration data. Nasal and temporal RPR measurements were significantly different in our sample.  相似文献   
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目的 探讨睫状肌麻痹后脑验光的可靠性。方法 选择社区幼儿园和中、小学校的6 ~13a 的健康儿童427 名,美多丽P扩瞳后,分别进行电脑验光和检影验光。用t 检验比较电脑验光和检影验光有无差别。电脑验光仪型号是TopconKR-7100,检影验光仪是Nidek 综合验光仪。结果 美多丽P扩瞳后电脑验光和检影验光有着显著差异( P< 0 . 01)。结论 美多丽P扩瞳后,电脑验光仍然不能取代检影验光,检影验光是最为有效的验光方法。  相似文献   
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