Copolymer-Based Progressive Addition Lens with Graded Index Designed for Astigmatism and Distortion Correction

2009 ◽  
Vol 1 (4) ◽  
pp. 907-912 ◽  
Author(s):  
Yuki Shitanoki ◽  
Akihiro Tagaya ◽  
Yasuhiro Koike
Keyword(s):  
Distortion Correction ◽  
Graded Index ◽  
Progressive Addition Lens

Application of Graded-Index for Astigmatism Reduction in Progressive Addition Lens

2009 ◽  
Vol 2 ◽  
pp. 032401
Author(s):  
Yuki Shitanoki ◽  
Akihiro Tagaya ◽  
Yasuhiro Koike
Keyword(s):  
Graded Index ◽  
Progressive Addition Lens

SPECTRA: A program for processing electron images of crystals

1992 ◽  
Vol 50 (1) ◽  
pp. 132-133
Author(s):  
M.F. Schmid ◽  
R. Dargahi ◽  
M. W. Tam
Keyword(s):  
Lattice Distortion ◽  
Data Transfer ◽  
Reciprocal Lattice ◽  
Data Entry ◽  
Image Data ◽  
Distortion Correction ◽  
Specimen Preparation ◽  
Electron Image ◽  
Computer Controlled ◽  
Program Modules

Electron crystallography is an emerging field for structure determination as evidenced by a number of membrane proteins that have been solved to near-atomic resolution. Advances in specimen preparation and in data acquisition with a 400kV microscope by computer controlled spot scanning mean that our ability to record electron image data will outstrip our capacity to analyze it. The computed fourier transform of these images must be processed in order to provide a direct measurement of amplitudes and phases needed for 3-D reconstruction.In anticipation of this processing bottleneck, we have written a program that incorporates a menu-and mouse-driven procedure for auto-indexing and refining the reciprocal lattice parameters in the computed transform from an image of a crystal. It is linked to subsequent steps of image processing by a system of data bases and spawned child processes; data transfer between different program modules no longer requires manual data entry. The progress of the reciprocal lattice refinement is monitored visually and quantitatively. If desired, the processing is carried through the lattice distortion correction (unbending) steps automatically.

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