Contrast transfer characteristics of the light sword optical element designed for presbyopia compensations

Petelczyc, Krzysztof; Bará, Salvador; Lopez, A. Ciro; Jaroszewicz, Zbigniew; Kakarenko, Karol; Kołodziejczyk, Andrzej; Sypek, Maciej

doi:10.2971/jeos.2011.11053

Cited by 11 publications

(17 citation statements)

References 25 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: 64%

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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supporting

confidence: 64%

Compensation of Presbyopia With the Light Sword Lens

Mira-Agudelo

Torres-Sepúlveda

Barrera

et al. 2016

Invest. Ophthalmol. Vis. Sci.

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“…According to previously reported theoretical studies, numerical simulations, and qualitative experiments [12][13][14][15][16][17][18], an element of this kind can form recognizable images of acceptable quality in the presence of a defocus of 0-4 diopters. The LSL demonstrated its superiority over other solutions designed especially for multifocal and EDF imaging.…”

Section: Discussionmentioning

confidence: 99%

“…It is necessary to briefly mention the tilt and decentration of the element, and the influence of the LSL junction on vision comfort. According to [17], the MTFs illustrating imaging realized by the LSL have nonzero values for wide ranges of frequencies and do not exhibit substantial oscillations. On the other hand, for defocusing values close to 0 diopter, these MTFs have small values for a large range of spatial frequencies.…”

Section: Discussionmentioning

confidence: 99%

“…The LSL used to add the EDF feature is described by the following shape function, defining the thickness of the element [17]:…”

Section: The Simplified Presbyopic Eye and The Lsl Elementmentioning

confidence: 99%

“…Numerical simulations and experiments have demonstrated interesting characteristics of the LSOEs in terms of their uniformity, high Strehl ratios [15], and the visual Strehl ratio [16] within the assumed range of defocus. Their imaging properties have also been analyzed by means of the modulation transfer function (MTF) [17] and through the calculation of two parameters showing similarity between the object and its image: namely, a root mean square deviation and a correlation coefficient [18].…”

Section: Introductionmentioning

confidence: 99%

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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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Potential use of cubic phase masks for extending the range of clear vision in presbyopes: initial calculation and simulation studies

Arines

Almaguer

Acosta

2017

Ophthalmic Physiologic Optic

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A cubic phase mask in the shape 7.07 μm × (Z -Z )-0.9 μm × Z is a good solution for obtaining a range of clear vision with at least 0.1 logMAR visual acuity (and close to 0.0 logMAR, 6/6, 20/20 and decimal Snellen 1.0) between 6.0 and 0.4 m for a pupil diameter of 5.0 mm. Our results seem to be a good starting point for future studies of this type of cubic phase mask solutions for presbyopia.

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Contrast transfer characteristics of the light sword optical element designed for presbyopia compensations

Cited by 11 publications

References 25 publications

Compensation of Presbyopia With the Light Sword Lens

Compensation of Presbyopia With the Light Sword Lens

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

Potential use of cubic phase masks for extending the range of clear vision in presbyopes: initial calculation and simulation studies

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