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

2017 ◽  
Vol 9 (4) ◽  
pp. 128 ◽  
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

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

2018 ◽  
Vol 10 (2) ◽  
pp. 36 ◽  
Author(s):  
Walter Torres-Sepúlveda ◽  
Alejandro Mira-Agudelo ◽  
John Fredy Barrera ◽  
Andrzej Kolodziejczyk
Keyword(s):  
New York ◽  
Experimental Study ◽  
Pupil Size ◽  
Focal Depth ◽  
Optical Element ◽  
Depth Of Focus ◽  
Variable Diameter ◽  
Diffraction Structure ◽  
Do So

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

scholarly journals Generating Bessel beams with broad depth-of-field by using phase-only acoustic holograms

2019 ◽  
Vol 9 (1) ◽  
Author(s):  
Sergio Jiménez-Gambín ◽  
Noé Jiménez ◽  
José M. Benlloch ◽  
Francisco Camarena
Keyword(s):  
Field Distribution ◽  
Focal Length ◽  
Bessel Beam ◽  
Transverse Field ◽  
High Order ◽  
Depth Of Field ◽  
Uniform Field ◽  
Axial Distribution ◽  
Bessel Beams ◽  
Wide Range

AbstractWe report zero-th and high-order acoustic Bessel beams with broad depth-of-field generated using acoustic holograms. While the transverse field distribution of Bessel beams generated using traditional passive methods is correctly described by a Bessel function, these methods present a common drawback: the axial distribution of the field is not constant, as required for ideal Bessel beams. In this work, we experimentally, numerically and theoretically report acoustic truncated Bessel beams of flat-intensity along their axis in the ultrasound regime using phase-only holograms. In particular, the beams present a uniform field distribution showing an elongated focal length of about 40 wavelengths, while the transverse width of the beam remains smaller than 0.7 wavelengths. The proposed acoustic holograms were compared with 3D-printed fraxicons, a blazed version of axicons. The performance of both phase-only holograms and fraxicons is studied and we found that both lenses produce Bessel beams in a wide range of frequencies. In addition, high-order Bessel beam were generated. We report first order Bessel beams that show a clear phase dislocation along their axis and a vortex with single topological charge. The proposed method may have potential applications in ultrasonic imaging, biomedical ultrasound and particle manipulation applications using passive lenses.

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

1990 ◽  
Vol 37 (8) ◽  
pp. 1283-1286 ◽  
Author(s):  
Andrzej Kołodziejczyk ◽  
Salvador Bará ◽  
Zbigniew Jaroszewicz ◽  
Maciej Sypek
Keyword(s):  
Optical Element ◽  
Depth Of Focus ◽  
Extended Depth Of Focus ◽  
Diffraction Structure

scholarly journals Depth-of-Field-Extended Plenoptic Camera Based on Tunable Multi-Focus Liquid-Crystal Microlens Array

Sensors ◽  
2020 ◽  
Vol 20 (15) ◽  
pp. 4142 ◽  
Author(s):  
Mingce Chen ◽  
Wenda He ◽  
Dong Wei ◽  
Chai Hu ◽  
Jiashuo Shi ◽  
...  
Keyword(s):  
Liquid Crystal ◽  
Radiation Power ◽  
Focal Length ◽  
Microlens Array ◽  
Oxide Semiconductor ◽  
Depth Of Field ◽  
Digital Refocusing ◽  
Wide Range ◽  
Cmos Sensor ◽  
Plenoptic Camera

Plenoptic cameras have received a wide range of research interest because it can record the 4D plenoptic function or radiance including the radiation power and ray direction. One of its important applications is digital refocusing, which can obtain 2D images focused at different depths. To achieve digital refocusing in a wide range, a large depth of field (DOF) is needed, but there are fundamental optical limitations to this. In this paper, we proposed a plenoptic camera with an extended DOF by integrating a main lens, a tunable multi-focus liquid-crystal microlens array (TMF-LCMLA), and a complementary metal oxide semiconductor (CMOS) sensor together. The TMF-LCMLA was fabricated by traditional photolithography and standard microelectronic techniques, and its optical characteristics including interference patterns, focal lengths, and point spread functions (PSFs) were experimentally analyzed. Experiments demonstrated that the proposed plenoptic camera has a wider range of digital refocusing compared to the plenoptic camera based on a conventional liquid-crystal microlens array (LCMLA) with only one corresponding focal length at a certain voltage, which is equivalent to the extension of DOF. In addition, it also has a 2D/3D switchable function, which is not available with conventional plenoptic cameras.

Subjective and objective depth of field measures in pseudophakic eyes: comparison between extended depth of focus, trifocal and bifocal intraocular lenses

2019 ◽  
Vol 40 (2) ◽  
pp. 351-359 ◽  
Author(s):  
Carlos Palomino-Bautista ◽  
Rubén Sánchez-Jean ◽  
David Carmona-González ◽  
David P. Piñero ◽  
Ainhoa Molina-Martín
Keyword(s):  
Intraocular Lenses ◽  
Depth Of Field ◽  
Depth Of Focus ◽  
Extended Depth Of Focus

The Design of a Hybrid Diffractive-Refractive Wide-Angle Eyepiece with a Large Exit Pupil Distance

2013 ◽  
Vol 710 ◽  
pp. 469-473
Author(s):  
Feng Wang ◽  
Jian Zhong Cao ◽  
En Shi Qu ◽  
Deng Qun Yu ◽  
A Qi Yan ◽  
...  
Keyword(s):  
Image Quality ◽  
Optical System ◽  
Focal Length ◽  
Optical Design ◽  
Random Phase ◽  
Optical Element ◽  
Wide Angle ◽  
Optical Elements ◽  
Exit Pupil ◽  
Design Software

The diffractive optical elements, with the negative dispersive characteristic and the random phase distributing to realize random phase modulation for wave-front, are not only helpful to simplify the optical system, but also improve the image quality, while putting it into the optical system. It can decrease the element numbers of the system and obtain a compact configuration that introducing diffractive optical element into the design of eyepiece. A hybrid diffractive-refractive wide-angle eyepiece, with a big exit pupil distance, is designed by using the Code V Optical Design Software. The features of the wide-angle eyepiece are 30mm effective focal length, 60°whole field-of-view (FOV), 30mm exit pupil distance and 6mm exit pupil diameter, and which consists of four lens and two diffractive elements. From the result of design, the MTF in the center field of the wide-angle eyepiece is over 0.55at 60lp/mm, at the same time, the MTFs in all fields are over 0.3 at 50lp/mm, which show that this wide-angle eyepiece has a great image quality.

scholarly journals Monocular Clinical Outcomes and Range of Near Vision following Cataract Surgery with Implantation of an Extended Depth of Focus Intraocular Lens

2018 ◽  
Vol 2018 ◽  
pp. 1-6 ◽  
Author(s):  
Rahul T. Pandit
Keyword(s):  
Visual Acuity ◽  
Intraocular Lens ◽  
Focal Length ◽  
Full Range ◽  
Case Series ◽  
Depth Of Focus ◽  
Retrospective Case ◽  
Distance Visual Acuity ◽  
Extended Depth Of Focus ◽  
Near Visual Acuity

Importance. A full range of near and intermediate vision has not been clinically evaluated for the Symfony extended depth of focus intraocular lens (EDOF IOL). Background. To evaluate the monocular range of near visual acuity with an EDOF IOL. Design. Retrospective case series. Participants. Consecutive patients of a single surgeon from January 2017 through March 2018. Methods. Phacoemulsification with implantation of an EDOF IOL. Main Outcome Measures. Uncorrected distance visual acuity (UDVA), uncorrected near visual acuity (UNVA), corrected distance visual acuity (CDVA), distance-corrected near visual acuity (DCNVA), range of DCNVA, and optimal near focal length. Results. Seventy-six eyes of 48 patients (34 or 71% female, mean age: 68 years) were included with a mean follow-up of 68 days. Mean values were as follows: logarithm of the minimum angle of resolution (logMAR) UDVA 0.02 ± 0.09, logMAR UNVA 0.12 ± 0.09 at a mean distance of 51 cm, logMAR CDVA −0.05 ± 0.07, logMAR DCNVA 0.08 ± 0.07 at a mean distance of 51 cm, and a spherical equivalent of −0.16 diopters ±0.35. Percentage of eyes achieving DCNVA of 20/30 were 84% at 36 cm, 92% at 41 cm, 99% at 51 cm, 93% at 61 cm, and 74% at 71 cm. DCNVA of 20/40 or better was achieved in nearly 100% of eyes over a range of 35 cm. Conclusions and Relevance. The Symfony EDOF IOL achieved excellent distance visual acuity while providing a 35 cm range of near visual acuity at levels useful for many tasks in nearly all patients.

Sign in / Sign up

Export Citation Format

Share Document