AIM： To evaluate and compare the uniformity of angle Kappa adjustment between Oculyzer and Topolyzer Vario topography guided ablation of laser in situ keratomileusis（LASIK） by EX500 excimer laser for myopia.METHODS...AIM： To evaluate and compare the uniformity of angle Kappa adjustment between Oculyzer and Topolyzer Vario topography guided ablation of laser in situ keratomileusis（LASIK） by EX500 excimer laser for myopia.METHODS： Totally 145 cases（290 consecutive eyes）with myopia received LASIK with a target of emmetropia. The ablation for 86 cases（172 eyes） was guided manually based on Oculyzer topography（study group）, while the ablation for 59 cases（118 eyes） was guided automatically by Topolyzer Vario topography（control group）. Measurement of adjustment values included data respectively in horizontal and vertical direction of cornea. RESULTS： Horizontally, synclastic adjustment between manually actual values（dx_（manu）） and Oculyzer topography guided data（dx_（ocu）） accounts 35.5% in study group, with mean dx_（manu）/dx_（ocu） of 0.78±0.48; while in control group, synclastic adjustment between automatically actual values（dx_（auto）） and Oculyzer topography data（dx_（ocu）） accounts 54.2%, with mean dx_（auto）/dx_（ocu） of 0.79±0.66. Vertically, synclastic adjustment between dy_（manu） and dy_（ocu） accounts 55.2% in study group, with mean dy_（manu）/dy_（ocu） of 0.61±0.42; while in control group, synclastic adjustment between dy_（auto） and dy_（ocu） accounts 66.1%, with mean dy_（auto）/dy_（ocu） of 0.66±0.65. There was no statistically significant difference in ratio of actual values/Oculyzer topography guided data in horizontal and vertical direction between two groups（P=0.951, 0.621）.CONCLUSION： There is high consistency in angle Kappa adjustment guided manually by Oculyzer and guided automatically by Topolyzer Vario topography during corneal refractive surgery by Wave Light EX500 excimer laser.展开更多
The gradient doping regions were employed in the emitter layer and the base layer of GaAs based laser power converters(LPCs).Silvaco TCAD was used to numerically simulate the linear gradient doping and exponential gra...The gradient doping regions were employed in the emitter layer and the base layer of GaAs based laser power converters(LPCs).Silvaco TCAD was used to numerically simulate the linear gradient doping and exponential gradient doping structure,and analyze the transport process of photogenerated carriers.Energy band adjustment via gradient doping improved the separation and transport efficiency of photogenerated carriers and reduced the total recombination rate of GaAs LPCs.Compared with traditional structure of LPCs,the photoelectric conversion efficiency of LPCs with linear and exponential gradient doping structure were improved from 52.7%to 57.2%and 57.7%,respectively,under 808 nm laser light at the power density of 1 W/cm^(2).展开更多
基金Supported by 215 High Level Talent Fund of Beijing Health Government(No.2013-2-023)
文摘AIM： To evaluate and compare the uniformity of angle Kappa adjustment between Oculyzer and Topolyzer Vario topography guided ablation of laser in situ keratomileusis（LASIK） by EX500 excimer laser for myopia.METHODS： Totally 145 cases（290 consecutive eyes）with myopia received LASIK with a target of emmetropia. The ablation for 86 cases（172 eyes） was guided manually based on Oculyzer topography（study group）, while the ablation for 59 cases（118 eyes） was guided automatically by Topolyzer Vario topography（control group）. Measurement of adjustment values included data respectively in horizontal and vertical direction of cornea. RESULTS： Horizontally, synclastic adjustment between manually actual values（dx_（manu）） and Oculyzer topography guided data（dx_（ocu）） accounts 35.5% in study group, with mean dx_（manu）/dx_（ocu） of 0.78±0.48; while in control group, synclastic adjustment between automatically actual values（dx_（auto）） and Oculyzer topography data（dx_（ocu）） accounts 54.2%, with mean dx_（auto）/dx_（ocu） of 0.79±0.66. Vertically, synclastic adjustment between dy_（manu） and dy_（ocu） accounts 55.2% in study group, with mean dy_（manu）/dy_（ocu） of 0.61±0.42; while in control group, synclastic adjustment between dy_（auto） and dy_（ocu） accounts 66.1%, with mean dy_（auto）/dy_（ocu） of 0.66±0.65. There was no statistically significant difference in ratio of actual values/Oculyzer topography guided data in horizontal and vertical direction between two groups（P=0.951, 0.621）.CONCLUSION： There is high consistency in angle Kappa adjustment guided manually by Oculyzer and guided automatically by Topolyzer Vario topography during corneal refractive surgery by Wave Light EX500 excimer laser.
基金This work was supported by the National Key R&D Program of China(No.2018YFB1500500)also supported by Ally Fund of Chinese Academy of Sciences(No.Y072051002).
文摘The gradient doping regions were employed in the emitter layer and the base layer of GaAs based laser power converters(LPCs).Silvaco TCAD was used to numerically simulate the linear gradient doping and exponential gradient doping structure,and analyze the transport process of photogenerated carriers.Energy band adjustment via gradient doping improved the separation and transport efficiency of photogenerated carriers and reduced the total recombination rate of GaAs LPCs.Compared with traditional structure of LPCs,the photoelectric conversion efficiency of LPCs with linear and exponential gradient doping structure were improved from 52.7%to 57.2%and 57.7%,respectively,under 808 nm laser light at the power density of 1 W/cm^(2).
