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Human eye ocular component analysis for refractive state and refractive surgery 被引量:3
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作者 Chao-Kai Chang Jui-Teng Lin Yong Zhang 《International Journal of Ophthalmology(English edition)》 SCIE CAS 2017年第7期1076-1080,共5页
AIM: To analyze the clinical factors influencing the human vision corrections via the changing of ocular components of human eye in various applications; and to analyze refractive state via a new effective axial leng... AIM: To analyze the clinical factors influencing the human vision corrections via the changing of ocular components of human eye in various applications; and to analyze refractive state via a new effective axial length.METHODS: An effective eye model was introduced by the ocular components of human eye including refractive indexes, surface radius(r1, r2, R1, R2) and thickness(t, T) of the cornea and lens, the anterior chamber depth(S1) and the vitreous length(S2). Gaussian optics was used to calculate the change rate of refractive error per unit amount of ocular components of a human eye(the rate function M). A new criterion of myopia was presented via an effective axial length.RESULTS: For typical corneal and lens power of 42 and 21.9 diopters, the rate function Mj(j=1 to 6) were calculated for a 1% change of r1, r2, R1, R2, t, T(in diopters) M1=+0.485, M2=-0.063, M3=+0.053, M4=+0.091, M5=+0.012, and M6=-0.021 diopters. For 1.0 mm increase of S1 and S2, the rate functions were M7=+1.35, and M8=-2.67 diopter/mm, respectively. These rate functions were used to analyze the clinical outcomes in various applications including laser in situ keratomileusis surgery, corneal cross linking procedure, femtosecond laser surgery and scleral ablation for accommodation.CONCLUSION: Using Gaussian optics, analytic formulas are presented for the change of refractive power due to various ocular parameter changes. These formulas provide useful clinical guidance in refractive surgery and other related procedures. 展开更多
关键词 Gaussian optics human eye ocular components refractive errors vision correction laser in situ keratomileusis corneal collagen crosslinking
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Coordinate difference homogenization matching method for motion correction in 3D range-intensity correlation laser imaging
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作者 Liang Sun Xinwei Wang +4 位作者 Pengdao Ren Pingshun Lei Songtao Fan Yan Zhou and Yuliang Liu 《Chinese Optics Letters》 SCIE EI CAS CSCD 2017年第10期95-98,共4页
This Letter proposes a coordinate difference homogenization matching method to solve motion influence in three-dimensional(3D) range-intensity correlation laser imaging. Firstly, features and feature pairs of gate i... This Letter proposes a coordinate difference homogenization matching method to solve motion influence in three-dimensional(3D) range-intensity correlation laser imaging. Firstly, features and feature pairs of gate images are obtained by speeded-up robust figures and bi-directional feature matching methods. The original mean value of the feature-pair coordinate differences is calculated. Comparing the coordinate differences with the original mean value, the wrong feature pairs are removed, and then an optimized mean value is updated. The final feature-pair coordinates are re-registered based on the updated mean value. Thus, an accurate transformation is established to rectify motion gate images for 3D reconstruction. In the experiment, a 3D image of a tower at 780 m is successfully captured by our laser gated imaging system on a pan-tilt device. 展开更多
关键词 Coordinate difference homogenization matching method for motion correction in 3D range-intensity correlation laser imaging CDH
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