Experimental evaluation of the light sword lens performance with a variable pupil size

This paper presents an experimental study designed to test the performance of the light sword lens (LSL) with different pupil sizes. To do so, Snellen optotype images obtained by a monofocal lens either with or without an LSL, were compared. Images were obtained for three different pupil sizes at several target vergences. The correlation coefficient and through-focus curves were obtained and compared. The experimental results show differences in the contrast and the depth of focus with different pupil sizes using the monofocal lens without an LSL. In contrast, when using the monofocal lens in combination with the LSL, the quality of the images is similar for all pupils and target vergences used, with slight differences only in halos and contrast. Full Text: PDF ReferencesG. Mikula, Z. Jaroszewicz, A. Kolodziejczyk, K. Petelczyc, M. Sypek, G. P. Agrawal, "Imaging with extended focal depth by means of lenses with radial and angular modulation", Opt Express 15, 9184, (2007). CrossRef A. Kolodziejczyk, S. Bará, Z. Jaroszewicz, M. Sypek, "The Light Sword Optical Element—a New Diffraction Structure with Extended Depth of Focus", J. Mod Opt. 37, 1283, (1990). CrossRef K. Petelczyc et al, "Presbyopia compensation with a light sword optical element of a variable diameter", Photonics Lett. Pol. 1, 55 (2009). DirectLink A. Mira-Agudelo et al, "Compensation of Presbyopia With the Light Sword Lens", Invest Ophthalmol Vis Sci 57, 6871, (2016). CrossRef R.A. Fisher, Statistical Methods for Research Workers (New York, Hafner, 13th Ed., 1958) CrossRef

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The Light Sword Optical Element—a New Diffraction Structure with Extended Depth of Focus

Journal of Modern Optics ◽

10.1080/09500349014551431 ◽

1990 ◽

Vol 37 (8) ◽

pp. 1283-1286 ◽

Cited By ~ 36

Author(s):

Andrzej Kołodziejczyk ◽

Salvador Bará ◽

Zbigniew Jaroszewicz ◽

Maciej Sypek

Keyword(s):

Optical Element ◽

Depth Of Focus ◽

Extended Depth Of Focus ◽

Diffraction Structure

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Do Strikes Kill? Evidence from New York State

American Economic Journal Economic Policy ◽

10.1257/pol.4.1.127 ◽

2012 ◽

Vol 4 (1) ◽

pp. 127-157 ◽

Cited By ~ 16

Author(s):

Jonathan Gruber ◽

Samuel A Kleiner

Keyword(s):

New York ◽

New York State ◽

York State ◽

Patient Demographics ◽

Us Economy ◽

Quality Of Patient Care ◽

The Us ◽

The Impact ◽

Do So

Hospitals now represent one of the largest union sectors of the US economy, and there is particular concern about the impact of strikes on patient welfare. We analyze the effects of nurses' strikes in hospitals on patient outcomes in New York State. Controlling for hospital specific heterogeneity, the results show that nurses' strikes increase in-hospital mortality by 18.3 percent and 30-day readmission by 5.7 percent for patients admitted during a strike, with little change in patient demographics, disease severity or treatment intensity. The results suggest that hospitals functioning during nurses' strikes do so at a lower quality of patient care. (JEL H75, I11, I12, J52)

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Imaging with extended depth of field by means of the peacock eye optical element

Photonics Letters of Poland ◽

10.4302/plp.v9i4.774 ◽

2017 ◽

Vol 9 (4) ◽

pp. 128 ◽

Cited By ~ 2

Author(s):

Walter Torres ◽

John F. Barrera ◽

Rodrigo Henao ◽

Zbigniew Jaroszewicz ◽

Karol Kakarenko ◽

...

Keyword(s):

Focal Length ◽

Random Phase ◽

Focal Depth ◽

Optical Element ◽

Depth Of Field ◽

Depth Of Focus ◽

Extended Depth Of Focus ◽

Wide Range ◽

Extended Depth Of Field ◽

Imaging Properties

The paper presents imaging properties of the peacock eye optical element. Its abilities for imaging with extended depth of field is illustrated experimentally in monochromatic as well as polychromatic light. According to the obtained results the element makes possible to maintain the acceptable resolution, contrast and brightness of the output images for a wide range of defocusing. Full Text: PDF ReferencesJ. Ares, R. Flores, S. Bara, and Z. Jaroszewicz, "Presbyopia Compensation with a Quartic Axicon", Optom. Vis. Sci. 82, 107 (2005). CrossRef G.-m. Dai, "Optical surface optimization for the correction of presbyopia", Appl. Opt. 45, 4184 (2006). CrossRef Z. Liu, A. Flores, M. R. Wang, and J. J. Yang, "Diffractive infrared lens with extended depth of focus", Opt. Eng. 46, 018002 (1-9) (2007). CrossRef E. E. Garcia-Guerrero, E. R. Mendez, H. M. Escamilla, T. A. Leskova, and A. A. Maradudin, "Design and fabrication of random phase diffusers for extending the depth of focus", Opt. Express 15, 910 (2007). CrossRef J. Lin, J. Liu, J. Ye, and S. Liu, "Design of microlenses with long focal depth based on the general focal length function", J. Opt. Soc. Am. A 24, 1747 (2007). CrossRef N. Davidson, A. A. Friesem, and E. Hasman, "Holographic axilens: high resolution and long focal depth", Opt. Lett. 16, 523 (1991). CrossRef A. Kołodziejczyk, S. Bara, Z. Jaroszewicz, and M. Sypek, "The Light Sword Optical Element?a New Diffraction Structure with Extended Depth of Focus", J. Mod. Opt. 37, 1283 (1990). CrossRef K. Petelczyc, S. Bará, A. Ciro Lopez, Z. Jaroszewicz, K. Kakarenko, A. Kolodziejczyk, and M. Sypek, "Imaging properties of the light sword optical element used as a contact lens in a presbyopic eye model", Opt. Express 19, 25602 (2011). CrossRef K. Kakarenko, I. Ducin, K. Grabowiecki, Z. Jaroszewicz, A. Kolodziejczyk, A. Mira-Agudelo, K. Petelczyc, A. Składowska, M. Sypek, "Assessment of imaging with extended depth-of-field by means of the light sword lens in terms of visual acuity scale", Biomed Opt Express 6, 1738 (2015). CrossRef Z. Jaroszewicz, A. Kołodziejczyk, D. Mouriz, and J. Sochacki, "Generalized Zone Plates Focusing Light into Arbitrary Line Segments", J. Mod. Opt. 40, 601 (1993). CrossRef L. A. Romero, M. S. Millían, Z. Jaroszewicz, A. Kolodziejczyk, "Double peacock eye optical element for extended focal depth imaging with ophthalmic applications", J. Biomed. Opt. 17 046013 (2012). CrossRef

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