Imaging with extended focal depth by means of the refractive light sword optical element

Gómez, José Antonio; Bará, Salvador; Garcia, M. Gomez; Jaroszewicz, Zbigniew; Kołodziejczyk, Andrzej; Petelczyc, Krzysztof

doi:10.1364/oe.16.018371

Cited by 28 publications

(22 citation statements)

References 28 publications

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“…23 The optical properties of the LSL and its imaging with extended depth of field have been widely studied numerically and experimentally. [20][21][22][23][24]26,27 These investigations confirmed that the images formed by the LSL have acceptable resolution and contrast. Therefore, lenses with angular modulation of optical power such as the LSL can be useful for imaging with extended depth of field.…”

supporting

confidence: 58%

“…This way, the refractive LSL can be used for imaging with extended depth of field in polychromatic light. 21 Moreover, computational results demonstrated the uniformity of Strehl's ratio of the LSL, which is almost constant along the entire length of the focal segment. 26 The ability of the LSL to correct presbyopia was studied in a model of the presbyopic human eye illuminated by white light.…”

mentioning

confidence: 92%

“…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. Performance of the LSL as a corrector element was evaluated recently by means of objective experiments using a simplified model of a presbyopic eye.…”

mentioning

confidence: 99%

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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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confidence: 58%

mentioning

confidence: 92%

mentioning

confidence: 99%

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Compensation of Presbyopia With the Light Sword Lens

Mira-Agudelo

Torres-Sepúlveda

Barrera

et al. 2016

Invest. Ophthalmol. Vis. Sci.

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“…A new approach to extending DOF in contact lenses is offered by what has been called the ‘light sword optical element’ . This can be regarded as a lens in which the power varies with the orientation of the semi‐diameter, so that successive lens sectors show a gradually changing power.…”

Section: Contact Lensesmentioning

confidence: 99%

“…This can be regarded as a lens in which the power varies with the orientation of the semi‐diameter, so that successive lens sectors show a gradually changing power. It is claimed that the DOF as judged by preservation of the Strehl ratio or visual tests is substantially enhanced over a range of pupil diameters. As yet development of such lenses is at an early stage.…”

Section: Contact Lensesmentioning

confidence: 99%

Developments in the correction of presbyopia I: spectacle and contact lenses

Charman

2013

Ophthalmic Physiologic Optic

147

136

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Purpose: To outline the refractive problems associated with presbyopia and to review the basis and relative merits of currently-available methods for their correction, with detailed consideration of spectacle and contact lens approaches. Contents: In the developed world, most of the present population will spend roughly half their lives as presbyopes. The well-known presbyopic changes with age in amplitude of accommodation and required near addition are briefly reviewed, together with the less widely acknowledged slow drifts that occur in distance refraction. The desirability of restoring to presbyopes clear vision for objects at any distance, ideally corresponding to vergences within the range of at least 0 to À5 D, in any viewing direction, is stressed. A general outline is given of possible corrective methods. Methods which satisfy the needs of a 50 year-old may not be suitable for the 80 year-old. Corrections may involve both fixed-and variablefocus lens systems, and surgical methods which modify the optics of the cornea, replace the crystalline lens with different fixed optics, or attempt to at least partially restore active accommodation. Some more recent methods of spectacle and contact lens correction are described in more detail. Particular attention is given to recent commercially-developed spectacles in which the corrective power can be varied actively by either mechanical (liquid-filled deformable lenses or Alvarez lenses) or electrical (liquid crystal lenses) means to allow objects at different distances to be seen clearly. Contact lens corrections show less progress and are still preferred only by a minority of older patients, most of whom are early presbyopes. Summary: The rising proportion of presbyopes in the population, covering an age span of around 40 years, represents both a problem for those concerned with giving their patients the best vision possible at both far and near viewing distances and a commercial opportunity. Traditional single-vision distance and near, bifocal, and progressive spectacle lens solutions, together with contact lens modalities for presbyopic correction, are being challenged by a variety of new approaches. It remains to be seen whether the latter will receive wide acceptance in practice.

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Combination of color coding and wavefront coding for extended depth of field

Cao

Zhai

et al. 2017

Optics Communications

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Imaging with extended focal depth by means of the refractive light sword optical element

Cited by 28 publications

References 28 publications

Compensation of Presbyopia With the Light Sword Lens

Compensation of Presbyopia With the Light Sword Lens

Developments in the correction of presbyopia I: spectacle and contact lenses

Combination of color coding and wavefront coding for extended depth of field

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