Extended depth of focus contact lenses for presbyopia

Zlotnik, Alex; Yaish, Shai Ben; Yehezkel, Oren; Lahav-Yacouel, Karen; Belkin, Michael; Zalevsky, Zeev

doi:10.1364/ol.34.002219

Cited by 21 publications

(8 citation statements)

References 12 publications

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“…Rather than manipulating the distribution of light amplitude across the lens, it appears to be more promising to alter the phase distribution. Zalaevsky and his colleagues have recently demonstrated a soft contact lens in which a binary profile is engraved on the lens surface, the pattern being described as ‘ two annular rings with widths of a few hundred microns each and a … depth of less than 700 nm’ . This is designed to produce a focus which extends over about 3 D as a result of the constructive interference of light from different zones of the lens.…”

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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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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“…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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“…The solution presented in this paper produces continuously focused vision over the full required range that in regular eye is covered by accommodation of 3.00D (from near range of 33cm and up to infinity) [11][12][13]. All this is obtained with static element with high energetic efficiency and without any need of applying force by the mussels of the eye.…”

Section: Introductionmentioning

confidence: 97%