AIM:To assess patients’ visual performance with glistenings in one piece soft hydrophobic acrylic intraocular lenses(IOLs)(Alcon)2y postoperatively.METHODS:This cross section trial included 120 eyes with one piece IO...AIM:To assess patients’ visual performance with glistenings in one piece soft hydrophobic acrylic intraocular lenses(IOLs)(Alcon)2y postoperatively.METHODS:This cross section trial included 120 eyes with one piece IOL at 2y postoperatively.Glistening was classified in 4 groups,ranging from 0(none)to 3(most evident)according to their severity in IOLs optics observed under a slit lamp.All eyes underwent a uncorrected and best-corrected visual acuity evaluation(UCVA and BCVA,LogMAR scale),a complete clinical examination,a contrast sensitivity(CS)evaluation by F.A.C.T chart,and a visual field test by Humphrey Field AnalyzerⅡ(HFA).One-way ANOVA was used for quantitative data,while Pearsonχ2test was used for qualitative data to analyze the visual function of 4glistening groups.RESULTS:Totally 120 eyes were enrolled with 30 eyes in each glistening group.There was no statistical correlation between glistening grades and patients’age,IOLs power,postoperative UCVA and BCVA(P】0.05).Quantificationally,CS values among each group were not statistically different.However,qualitative analysis showed there were more eyes in grade 3 group than in grade 0 group having abnormally declined CS at high spatial frequency(10%vs 36.7%at 18 cpd,P=0.029;6.7%vs 26.7%at 12 cpd,P=0.013).Mean deviation(MD)of the visual field test was-2.14±2.31,-1.97±2.23,-3.02±3.17,-4.12±3.38 in group 0 to 3 respectively.There was a significant decrease in the most serious glistenings group(P=0.018).CONCLUSION:Glistenings may potentially have an impact on contrast sensitivity at high spatial frequency and MD in visual field test.展开更多
The work presented in this paper is a study of output temporal contrast degradation by near-field quality deterioration,such as intensity modulation and wavefront deviation, in a large aperture high power short pulse ...The work presented in this paper is a study of output temporal contrast degradation by near-field quality deterioration,such as intensity modulation and wavefront deviation, in a large aperture high power short pulse laser system. A twostep focusing algorithm with a coordinate transform based on the Fresnel approximation in the space domain is used for simulating the output focused by an off-axis parabolic mirror. The temporal contrast degradation by intensity modulation and wavefront deviation is analyzed and the influence of the diameter on the temporal contrast degradation is revealed.The simulation and assumption results based on the parameters of the Shen Guang-II laser system are compared with the online experimental temporal contrast data. The near-field quality deterioration might lead to temporal contrast degradation, hindering higher temporal contrast in large aperture high power short pulse laser systems.展开更多
This article discusses the result of cognitive deviation originating from the lexical and syntactic difference between English and Chinese. By analyzing three different aspects involved in this paper, namely, syntheti...This article discusses the result of cognitive deviation originating from the lexical and syntactic difference between English and Chinese. By analyzing three different aspects involved in this paper, namely, synthetic versus analytic, compact versus diffusive and hypotactic versus paratactic deviations, a conclusion can be drawn that consciousness of necessary information qualifies a translator for work only when he is familiar with this kind of cognitive deviation.展开更多
An adaptive contrast enhancement (ACE) algorithm is presented in this paper, in which the contrast gain is determined by mapping the local standard deviation (LSD) histogram of an image to a Gaussian distribution func...An adaptive contrast enhancement (ACE) algorithm is presented in this paper, in which the contrast gain is determined by mapping the local standard deviation (LSD) histogram of an image to a Gaussian distribution function. The contrast gain is nonlinearly adjusted to avoid noise overenhancement and ringing artifacts while improving the detail contrast with less computational burden. The effectiveness of our method is demonstrated with radiological images and compared with other algorithms.展开更多
基金Supported by the Science and Technology Planof Guangdong Province,Guangzhou,China(No.2006B36006005)
文摘AIM:To assess patients’ visual performance with glistenings in one piece soft hydrophobic acrylic intraocular lenses(IOLs)(Alcon)2y postoperatively.METHODS:This cross section trial included 120 eyes with one piece IOL at 2y postoperatively.Glistening was classified in 4 groups,ranging from 0(none)to 3(most evident)according to their severity in IOLs optics observed under a slit lamp.All eyes underwent a uncorrected and best-corrected visual acuity evaluation(UCVA and BCVA,LogMAR scale),a complete clinical examination,a contrast sensitivity(CS)evaluation by F.A.C.T chart,and a visual field test by Humphrey Field AnalyzerⅡ(HFA).One-way ANOVA was used for quantitative data,while Pearsonχ2test was used for qualitative data to analyze the visual function of 4glistening groups.RESULTS:Totally 120 eyes were enrolled with 30 eyes in each glistening group.There was no statistical correlation between glistening grades and patients’age,IOLs power,postoperative UCVA and BCVA(P】0.05).Quantificationally,CS values among each group were not statistically different.However,qualitative analysis showed there were more eyes in grade 3 group than in grade 0 group having abnormally declined CS at high spatial frequency(10%vs 36.7%at 18 cpd,P=0.029;6.7%vs 26.7%at 12 cpd,P=0.013).Mean deviation(MD)of the visual field test was-2.14±2.31,-1.97±2.23,-3.02±3.17,-4.12±3.38 in group 0 to 3 respectively.There was a significant decrease in the most serious glistenings group(P=0.018).CONCLUSION:Glistenings may potentially have an impact on contrast sensitivity at high spatial frequency and MD in visual field test.
基金supported by the National High-Tech Committee of China (Grant no.2013AA8044010)
文摘The work presented in this paper is a study of output temporal contrast degradation by near-field quality deterioration,such as intensity modulation and wavefront deviation, in a large aperture high power short pulse laser system. A twostep focusing algorithm with a coordinate transform based on the Fresnel approximation in the space domain is used for simulating the output focused by an off-axis parabolic mirror. The temporal contrast degradation by intensity modulation and wavefront deviation is analyzed and the influence of the diameter on the temporal contrast degradation is revealed.The simulation and assumption results based on the parameters of the Shen Guang-II laser system are compared with the online experimental temporal contrast data. The near-field quality deterioration might lead to temporal contrast degradation, hindering higher temporal contrast in large aperture high power short pulse laser systems.
基金This work was supported in part by a grant from the National Science Foundation （No. 08BYY046）.
文摘This article discusses the result of cognitive deviation originating from the lexical and syntactic difference between English and Chinese. By analyzing three different aspects involved in this paper, namely, synthetic versus analytic, compact versus diffusive and hypotactic versus paratactic deviations, a conclusion can be drawn that consciousness of necessary information qualifies a translator for work only when he is familiar with this kind of cognitive deviation.
基金the National Natural Science Foundation of China(No:3 963 0 1 1 0 ) the National Key Technologies R&D Programme under Con-tract96-92 0 -1 2 -0 1
文摘An adaptive contrast enhancement (ACE) algorithm is presented in this paper, in which the contrast gain is determined by mapping the local standard deviation (LSD) histogram of an image to a Gaussian distribution function. The contrast gain is nonlinearly adjusted to avoid noise overenhancement and ringing artifacts while improving the detail contrast with less computational burden. The effectiveness of our method is demonstrated with radiological images and compared with other algorithms.
