Diffractive-refractive intraocular lenses

Lenkova, G. A.; Korolkov, V. P.; Koronkevich, V. P.; Насыров, Р. К.; Gutman, A. S.; Iskakov, I. A.; Треушников, В. М.

doi:10.3103/s8756699008040092

Cited by 9 publications

(6 citation statements)

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“…As can be seen from (16), depends on the refractive indices and similarly to a thin refractive lens (see (5) at and equality of the refractive indices of the surrounding medium in front of and behind the lens). Consequently, the chromatic aberration of a harmonic PIOL will have a refractive component.…”

Section: Calculation Of Chromatic Aberrations Of the Eye With Hybrid mentioning

confidence: 97%

“…Application of diffractive elements for vision correction can substantially affect chromatic aberrations of the eye. Artificial crystalline lenses in the form of diffractive-refractive intraocular lenses [4,5] do not increase aberrations of the eye compared to the natural crystalline lens due to an optimal combination of the optical powers and dispersions of components of the intraocular lens and cornea. In the case of a PIOL, aberrations of the eye will depend on the optical powers and dispersions of the PIOL, cornea, and crystalline lens of the eye.…”

Section: Calculations Of Piolsmentioning

confidence: 99%

“…2) the cornea of which was similar to that that we used in the development of an artificial crystalline lens-a diffractive-refractive intraocular lens [4,5]. The parameters of the model were as follows: = 7.8 mm, 0.55 mm are the radii of curvature and the thickness of the cornea, respectively; is the distance from the cornea to the crystalline lens; and is the refractive index of the aqueous humor.…”

Section: Calculations Of Piolsmentioning

confidence: 99%

“…Below, we present several formulas [5,6] that are necessary to calculate the dependence of chromatic aberrations of a PIOL on the properties of its constituent elements. Optical power of a system of two components in the form of lenses, refracting surfaces, or diffractive elements with optical powers and is given by , (4) where and are the front and rear focal distances, respectively; is the distance between the components; and , , and are the refractive indices of the media in front of the system, inside it, and behind it, respectively.…”

Section: Calculations Of Piolsmentioning

confidence: 99%

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On the possibility of application of kinoform and harmonic diffraction structures in constructions of phakic intraocular lenses

Lenkova

2015

Opt. Spectrosc.

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Chromatic aberrations of the eye that arise upon application of diffraction structures such as Fresnel phase lenses with an ordinary (kinoform) or deep (harmonic) profile and diffraction-refraction (hybrid) structures in constructions of phakic (i.e., without lensectomy) intraocular lenses have been investigated analytically. Investigations have been done based on an eye model. It has been shown that, if kinoform (with a profile depth on the order of one wavelength) or hybrid structures are used, chromatic aberrations do not exceed 1 D (i.e., are comparable with aberrations of the ordinary eye) only in a positive range optical powers, which are restricted by the values of +7 and +15 D, respectively. If a harmonic structure is used (with a profile depth on the order of 20 wavelengths), the chromatic aberrations do not exceed 1 D in the entire interval of optical powers of phakic lenses from -25 to +15 D.

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Section: Calculation Of Chromatic Aberrations Of the Eye With Hybrid mentioning

confidence: 97%

Section: Calculations Of Piolsmentioning

confidence: 99%

Section: Calculations Of Piolsmentioning

confidence: 99%

Section: Calculations Of Piolsmentioning

confidence: 99%

See 2 more Smart Citations

On the possibility of application of kinoform and harmonic diffraction structures in constructions of phakic intraocular lenses

Lenkova

2015

Opt. Spectrosc.

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“…In the binary version, the spiral axicon looks like a spiral ring grating [ 194 ]. When an axicon is supplemented with a lens, another interesting optical element is obtained—a lensacon [ 195 , 196 ]—which was suggested to use a corrective element in the optical system of the human eye [ 197 , 198 ]. An artificial eye lens in the form of a thin plate whose surfaces have microrelief in the form of a circular diffraction grating can be implanted through a small incision, which significantly reduces surgery risks.…”

Section: Other Related Applicationsmentioning

confidence: 99%

Bessel Beam: Significance and Applications—A Progressive Review

et al. 2020

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Diffraction is a phenomenon related to the wave nature of light and arises when a propagating wave comes across an obstacle. Consequently, the wave can be transformed in amplitude or phase and diffraction occurs. Those parts of the wavefront avoiding an obstacle form a diffraction pattern after interfering with each other. In this review paper, we have discussed the topic of non-diffractive beams, explicitly Bessel beams. Such beams provide some resistance to diffraction and hence are hypothetically a phenomenal alternate to Gaussian beams in several circumstances. Several outstanding applications are coined to Bessel beams and have been employed in commercial applications. We have discussed several hot applications based on these magnificent beams such as optical trapping, material processing, free-space long-distance self-healing beams, optical coherence tomography, superresolution, sharp focusing, polarization transformation, increased depth of focus, birefringence detection based on astigmatic transformed BB and encryption in optical communication. According to our knowledge, each topic presented in this review is justifiably explained.

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