Strehl ratios characterizing optical elements designed for presbyopia compensation

Petelczyc, Krzysztof; Gómez, José Antonio; Bará, Salvador; Jaroszewicz, Zbigniew; Kakarenko, Karol; Kołodziejczyk, Andrzej; Sypek, Maciej

doi:10.1364/oe.19.008693

Cited by 25 publications

(36 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: 59%

“…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. 22 The results showed that the LSL enables defocus compensation in the range of 0 to 4 D. These properties make the LSL valuable for ophthalmic applications and for presbyopia correction in particular.…”

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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: 59%

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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“…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%

“…This gives rise to one of their important advantages as compared with the remaining elements: namely, the independence of their optical power range with respect to the pupil's diameter [14]. 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%

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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“…Several diffractive elements with EDOF imaging properties, of radial (e.g., axicons 13 and axilens 14 ) and angular (e.g., light sword 15 ) modulation, have been recently considered for presbyopia compensation in aged human vision. [16][17][18] In Ref. 19, the authors describe a family of computergenerated DOEs that perform as generalized zone plates capable to focus light into an arbitrary line segment with any orientation with respect to the optical axis.…”

Section: Introductionmentioning

confidence: 99%

Double peacock eye optical element for extended focal depth imaging with ophthalmic applications

et al. 2012

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Abstract. The aged human eye is commonly affected by presbyopia, and therefore, it gradually loses its capability to form images of objects placed at different distances. Extended depth of focus (EDOF) imaging elements can overcome this inability, despite the introduction of a certain amount of aberration. This paper evaluates the EDOF imaging performance of the so-called peacock eye phase diffractive element, which focuses an incident plane wave into a segment of the optical axis and explores the element's potential use for ophthalmic presbyopia compensation optics. Two designs of the element are analyzed: the single peacock eye, which produces one focal segment along the axis, and the double peacock eye, which is a spatially multiplexed element that produces two focal segments with partial overlapping along the axis. The performances of the peacock eye elements are compared with those of multifocal lenses through numerical simulations as well as optical experiments in the image space. The results demonstrate that the peacock eye elements form sharper images along the focal segment than the multifocal lenses and, therefore, are more suitable for presbyopia compensation. The extreme points of the depth of field in the object space, which represent the remote and the near object points, have been experimentally obtained for both the single and the double peacock eye optical elements. The double peacock eye element has better imaging quality for relatively short and intermediate distances than the single peacock eye, whereas the latter seems better for far distance vision.

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Strehl ratios characterizing optical elements designed for presbyopia compensation

Cited by 25 publications

References 28 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

Double peacock eye optical element for extended focal depth imaging with ophthalmic applications

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