Quality of electro-holographic image measured with Shack-Hartmann wavefront sensor (Conference Presentation)

2019 ◽  
Author(s):  
Jung-Young Son ◽  
Min-Sik Park ◽  
Min-Chul Park ◽  
Hyoung Lee ◽  
Jung Kim
Keyword(s):  
Wavefront Sensor ◽  
Holographic Image

Study of the quality of the Zeiss-1000 telescope optical system using the Shack–Hartmann wavefront sensor

2017 ◽  
Vol 72 (2) ◽  
pp. 206-216 ◽  
Author(s):  
S. V. Drabek ◽  
V. V. Komarov ◽  
S. A. Potanin ◽  
A. D. Savvin ◽  
A. S. Moskvitin ◽  
...  
Keyword(s):  
Optical System ◽  
Wavefront Sensor

scholarly journals Improve the quality of holographic image with complex-amplitude metasurface

2019 ◽  
Vol 27 (23) ◽  
pp. 33700
Author(s):  
Qiang Jiang ◽  
Liangcai Cao ◽  
Hao Zhang ◽  
Guofan Jin
Keyword(s):  
Complex Amplitude ◽  
Holographic Image

Characterization of distortions in electro-holographic image by A Shack-Hartmann wavefront sensor

2020 ◽  
Author(s):  
Jung-Young Son ◽  
Tetiana Venkel ◽  
Aleksei Chernyshov ◽  
Hyoung Lee ◽  
Hyun-Woo Kim
Keyword(s):  
Wavefront Sensor ◽  
Holographic Image

scholarly journals Characterizing optical quality of abnormal eyes using large dynamic range Shack-Hartmann wavefront sensor

2004 ◽  
Vol 4 (11) ◽  
pp. 94-94
Author(s):  
G. Yoon ◽  
S. Pantanelli ◽  
T. M. Jeong ◽  
S. MacRae
Keyword(s):  
Dynamic Range ◽  
Optical Quality ◽  
Wavefront Sensor ◽  
Large Dynamic Range

scholarly journals New method to improve the quality of vision in cataractous keratoconus eyes

2020 ◽  
Vol 10 (1) ◽  
Author(s):  
Juan J. Miret ◽  
Vicente J. Camps ◽  
Celia García ◽  
María T. Caballero ◽  
Dolores de Fez ◽  
...  
Keyword(s):  
Optical Quality ◽  
Wavefront Sensor ◽  
Fourier Optics ◽  
Clinical Validation ◽  
Quality Of Vision ◽  
Monofocal Iol ◽  
Schematic Eye ◽  
Theoretical Simulations ◽  
Selection Of

AbstractTo analyze using optical simulations if the proper use of a segmented intraocular lens (IOL) can improve the visual outcomes compared to the implantation of a spherical monofocal IOL. The wavefront profile of the Mplus (Oculentis) and a monofocal IOLs with the phase transformation introduced by each IOL were calculated using a Hartmann-Shack wavefront sensor. In addition, the wavefront profile of schematic eye models of various keratoconus conditions was obtained and was propagated to the IOLs. The optical performance of such combination was obtained after combining ray tracing and Fourier optics. A pre-clinical validation was also evaluated incorporating clinical data from three different keratoconus eyes of three patients. The implantation of the Mplus IOL can compensate or reduce the overall coma of the eye with keratoconus improving the quality of vision compared with a spherical monofocal IOL due to lower displacements of the retinal image or tilting in keratoconus. All theoretical simulations were confirmed afterwards by mean of a preclinical validation. The use of a standard toric segmented IOL with a proper orientation and selection of the addition can improve the optical quality of the keratoconus eye compared to the use of a monofocal spherical IOL.

scholarly journals Aberration-Based Quality Metrics in Holographic Lenses

Polymers ◽  
2020 ◽  
Vol 12 (4) ◽  
pp. 993 ◽  
Author(s):  
Tomás Lloret ◽  
Víctor Navarro-Fuster ◽  
Manuel G. Ramírez ◽  
Marta Morales-Vidal ◽  
Augusto Beléndez ◽  
...  
Keyword(s):  
Modulation Transfer Function ◽  
Cutoff Frequency ◽  
Optical Quality ◽  
Wavefront Sensor ◽  
Mean Square ◽  
Modulation Transfer ◽  
Symmetrical Configuration ◽  
Good Agreement ◽  
Seidel Coefficients

Aberrations and the image quality of holographic lenses were evaluated by a Hartmann–Shack (HS) wavefront sensor. Two lenses, one recorded with a symmetrical configuration and the other with an asymmetrical one, were stored in a photopolymer called Biophotopol. Each was reconstructed with two different wavelengths, 473 nm and 633 nm. Different metrics were applied to determine and quantify the aberration of the lenses (Zernike coefficients, Seidel coefficients, Marechal tolerances, root-mean-square (RMS), peak to valley, critical fraction of the pupil), and the quality of the image they provided (Strehl ratio, entropy, cutoff frequency, modulation transfer function (MTF), and area under the MTF). Good agreement between the metrics related to optical quality was obtained. The negative asymmetric holographic lenses had less aberration than the positive symmetric ones.

Immunoferritin localization of intracellular antigens in positively stained frozen sections

1978 ◽  
Vol 36 (2) ◽  
pp. 168-169
Author(s):  
K. T. Tokuyasu
Keyword(s):  
Surface Tension ◽  
Water Surface ◽  
Thin Layers ◽  
The Other ◽  
Positive Staining ◽  
Frozen Sections ◽  
The Past ◽  
Ultrathin Frozen Sections ◽  
Definition Of

During the past investigations of immunoferritin localization of intracellular antigens in ultrathin frozen sections, we found that the degree of negative staining required to delineate u1trastructural details was often too dense for the recognition of ferritin particles. The quality of positive staining of ultrathin frozen sections, on the other hand, has generally been far inferior to that attainable in conventional plastic embedded sections, particularly in the definition of membranes. As we discussed before, a main cause of this difficulty seemed to be the vulnerability of frozen sections to the damaging effects of air-water surface tension at the time of drying of the sections.Indeed, we found that the quality of positive staining is greatly improved when positively stained frozen sections are protected against the effects of surface tension by embedding them in thin layers of mechanically stable materials at the time of drying (unpublished).

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