Presbyopia Compensation with a Quartic Axicon

Ares, Jorge; Flores, Ramón; Bará, Salvador; Jaroszewicz, Zbigniew

doi:10.1097/01.opx.0000192347.57764.4c

Cited by 60 publications

(33 citation statements)

References 9 publications

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“…In general, they can be divided into three main families: accommodative proposals, multifocal proposals, and proposals with Extended Depth of Field (EDF). Between the members of the second group, there can be found bifocal or multifocal lenses [1,2], whereas in the last group one can find rotationally symmetric phase masks [3][4][5], axicons [6][7][8], lenses with negative spherical aberration [9,10], and light sword optical elements (LSOEs) [11][12][13]. In contrast to other elements, the LSOEs are distinguished by angular variation of the optical power.…”

Section: Introductionmentioning

confidence: 99%

Assessment of imaging with extended depth-of-field by means of the light sword lens in terms of visual acuity scale

Kakarenko

Ducin

Grabowiecki

et al. 2015

Biomed. Opt. Express

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Abstract:We present outcomes of an imaging experiment using the refractive light sword lens (LSL) as a contact lens in an optical system that serves as a simplified model of the presbyopic eye. The results show that the LSL produces significant improvements in visual acuity of the simplified presbyopic eye model over a wide range of defocus. Therefore, this element can be an interesting alternative for the multifocal contact and intraocular lenses currently used in ophthalmology. The second part of the article discusses possible modifications of the LSL profile in order to render it more suitable for fabrication and ophthalmological applications.

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Section: Introductionmentioning

confidence: 99%

Assessment of imaging with extended depth-of-field by means of the light sword lens in terms of visual acuity scale

Kakarenko

Ducin

Grabowiecki

et al. 2015

Biomed. Opt. Express

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“…These elements allow the subject to recognize objects at different distances. These optical elements include axicons with an axial symmetry profile 17 and some structures with an asymmetrical profile such as the cubic phase mask, 18 the peacock eye optical element, 19 and the light sword lens (LSL). 20 Previous studies have proposed use of the LSL to correct presbyopia [20][21][22][23][24] because it was designed to image objects at a wide range of distances.…”

mentioning

confidence: 99%

Compensation of Presbyopia With the Light Sword Lens

Mira-Agudelo

Torres-Sepúlveda

Barrera

et al. 2016

Invest. Ophthalmol. Vis. Sci.

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Citation: Mira-Agudelo A, TorresSepúlveda W, Barrera JF, et al. Compensation of presbyopia with the light sword lens. Invest Ophthalmol Vis Sci. 2016;57:6870-6877. DOI: 10.1167/iovs.16-19409 PURPOSE. We present the first physiological evaluation of the use of the light sword lens (LSL) for presbyopia compensation. The LSL is an axially asymmetric optical element designed for imaging with extended depth of focus. METHODS.A monocular visual simulator setup is implemented to measure visual acuity (VA). Physiological presbyopia is ''mimicked'' in human subjects by paralysis of the ciliary muscle, using topical application of a muscarinic antagonist. The effect of a contact lens-configured LSL on the mimicked presbyopia visual system is evaluated by measuring VA as a function of target vergence. The ability of the LSL to compensate presbyopia for 2 photopic luminance values was also analyzed. RESULTS.The average VA values for 11 subjects suggest that the LSL can compensate for presbyopia across a wide range of target vergences for which the LSL was designed (À3 to 0 D). However, the proposed corrector element causes a loss of distance VA. The mean logMAR VA in that target vergence range was 0.07. The VA curves also show that luminance does not affect the expected behavior of the LSL-corrected presbyopic eye. CONCLUSIONS.These results indicate that the LSL has significant potential as a visual aid for presbyopia.Keywords: aging changes, ophthalmic optics, presbyopia, vision acuity, visual optics P resbyopia is the decrease in accommodative amplitude of the human visual system that occurs with aging of the eye. 1Although presbyopia is a progressive vision disorder that affects everyone after a certain age, 2 there is no effective way to prevent it. Therefore, over the last 2 decades, important optical investigations have been undertaken to find ways to compensate for this visual condition.Over time, different optical methods to correct presbyopia and restore the ability to recognize both distant and near objects have been proposed.3-6 Some proposals include reading glasses, monovision, residual myopia, multifocal lenses used in glasses, contact lenses, and intraocular lenses. Multifocal intraocular lenses usually are bifocal or trifocal. 7,8 Recent proposals include modifying the topography of the cornea with refractive surgery 4 or inserting a small-aperture (pinhole) implant to artificially reduce the size of the pupil and generate a wider depth of focus. 9Other possible ways to correct presbyopia include varifocal elements based on the Alvarez lenses 10 or programmable lenses based on spatial light modulators, 11,12 which are classified as accommodative lenses. In addition, adjustable lenses that attempt to mimic how the eye lens functions have been designed, 13,14 and changing the optical power by axial displacement of a lens of a fixed focus has also been implanted and tested. 15,16 Despite multiple proposals and scientific advances, there is still no entirely satisfactory way to correct presbyopia. For some p...

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“…However there, the EDOF is obtained by reduction of the pupil size which yields reduced energetic efficiency as well as low imaging resolution. The EDOF based axicon solution for ophthalmology [11] is also not optimal due to the required refractive addition that should be added to the IOL.…”

Section: Introductionmentioning

confidence: 98%

Extended depth of focus intra-ocular lens: a solution for presbyopia and astigmatism

et al. 2010

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Purpose: Subjects after cataract removal and intra-ocular lens (IOL) implantation lose their accommodation capability and are left with a monofocal visual system. The IOL refraction and the precision of the surgery determine the focal distance and amount of astigmatic aberrations. We present a design, simulations and experimental bench testing of a novel, non-diffractive, non-multifocal, extended depth of focus (EDOF) technology incorporated into an IOL that allows the subject to have astigmatic and chromatic aberrations-free continuous focusing ability from 35cm to infinity as well as increased tolerance to IOL decentration. Methods: The EDOF element was engraved on a surface of a monofocal rigid IOL as a series of shallow (less than one micron deep) concentric grooves around the optical axis. These grooves create an interference pattern extending the focus from a point to a length of about one mm providing a depth of focus of 3.00D (D stands for Diopters) with negligible loss of energy at any point of the focus while significantly reducing the astigmatic aberration of the eye and that generated during the IOL implantation. The EDOF IOL was tested on an optical bench simulating the eye model. In the experimental testing we have explored the characteristics of the obtained EDOF capability, the tolerance to astigmatic aberrations and decentration. Results: The performance of the proposed IOL was tested for pupil diameters of 2 to 5mm and for various spectral illuminations. The MTF charts demonstrate uniform performance of the lens for up to 3.00D at various illumination wavelengths and pupil diameters while preserving a continuous contrast of above 25% for spatial frequencies of up to 25 cycles/mm. Capability of correcting astigmatism of up to 1.00D was measured. Conclusions: The proposed EDOF IOL technology was tested by numerical simulations as well as experimentally characterized on an optical bench. The new lens is capable of solving presbyopia and astigmatism simultaneously by providing focus extension of 3.00D under various illumination conditions, wavelengths and pupil diameters of the implanted lens without loss of energy at any of the relevant distances.

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Presbyopia Compensation with a Quartic Axicon

Abstract: The results show the usefulness of the proposed approach and point out the need for developing further adapted optimizations.

Cited by 60 publications

References 9 publications

Assessment of imaging with extended depth-of-field by means of the light sword lens in terms of visual acuity scale

Assessment of imaging with extended depth-of-field by means of the light sword lens in terms of visual acuity scale

Compensation of Presbyopia With the Light Sword Lens

Extended depth of focus intra-ocular lens: a solution for presbyopia and astigmatism

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