Gradient-index contact lens

Koike, Yasuhiro; Asakawa, Akihiko; Wu, Shang; Nihei, Eisuke

doi:10.1364/ao.34.004669

Cited by 12 publications

(11 citation statements)

References 4 publications

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“…For example, designing contact lenses by using GRIN materials would be possible; in this case the merit function to optimize has to be mainly the spherical aberration [6]. For example, designing contact lenses by using GRIN materials would be possible; in this case the merit function to optimize has to be mainly the spherical aberration [6].…”

Section: Results From the Programmentioning

confidence: 99%

Ray tracing for ophthalmic optics: specific developments for GRIN materials

Moneo¹,

Juvells²,

Vallmitjana³

et al. 1998

ROMOPTO '97: Fifth Conference on Optics

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In this work we present the developments for the simulation of image formation through an ophthalmic lens. The procedure is, essentially an exact ray tracing taking into account the particular mobility conditions of the exit pupil. This leads to the computation of astigmatism as a function of the field angle considered. In the computer program, the use of a commercial glass with a gradient in the refractive index (GRIN material) is foreseen. This latter feature proves to be useful for two practical objectives: modifying the power and the astigmatism of the lens. To illustrate these points, an example based on a lens made by deforming a plane parallel plate of GRIN material will be presented.

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Section: Results From the Programmentioning

confidence: 99%

Ray tracing for ophthalmic optics: specific developments for GRIN materials

Moneo¹,

Juvells²,

Vallmitjana³

et al. 1998

ROMOPTO '97: Fifth Conference on Optics

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“…[29][30][31][32][33][34][35] For example, bifocal or varifocal lenses could be produced in this way. [36][37][38][39] Advances in free-form surfacing have reduced the need to consider the gradient-index alternative.…”

Section: Commentarymentioning

confidence: 99%

Thomas Young's contributions to geometrical optics

Atchison

Charman

2011

Clinical and Experimental Optometry

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“…The interest in GRIN evolves from a motivation to reduce spherical aberration and chromatic aberration of optical lenses [1] , and it has been used for various applications such as rod lenses and optical fibers. In this research, we propose to use GRIN to control astigmatism in a non-rotationally symmetric lens, progressive addition lens (PAL), and demonstrate a fabrication method of GRIN-PAL by polymeric materials.…”

Section: Progressive Addition Lens (Pal) and Its Aberrations: Astigmamentioning

confidence: 99%

“…For example, GRIN in which refractive index increases toward the center of the lens in the radial direction gives a light-focusing function. On the other hand, GRIN in which refractive index decreases toward the center of the lens gives a light-diffusing function [1] . Since astigmatism is caused by difference in focusing power at each direction, addition of GRIN oriented in the direction with the smallest power compensates the focusing power in that particular direction, which leads to the reduction of astigmatism.…”

Section: Reduction Of Astigmatism and Distortion In Pal Using Grinmentioning

confidence: 99%

Application of polymer graded-index materials for aberration correction of progressive addition lenses

2009

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Graded-index (GRIN) progressive addition lens (PAL) was successfully fabricated, and GRIN's potential for aberration correction of PAL was confirmed. GRIN material was prepared by partial diffusion of methyl methacrylate (MMA (n d at polymer = 1.492)) monomer into cross-linked benzyl methacrylate (BzMA (n d at polymer=1.568)) flat gel, and GRIN-PAL was prepared by polymerization of the GRIN material attached to a mold of commercially available PAL. GRIN polymer materials have been used for various applications such as rod lenses and optical fibers. GRIN represents gradual change of refractive index in a material, which adds or reduces light focusing power of the material. PAL is a multifocal spectacle lens for presbyopia. However, some localized aberrations (especially astigmatism) in PAL have not yet been reduced satisfactorily for decades by optimizing surface geometry of a lens. In this research, we propose to employ GRIN materials for astigmatism reduction of PALs. BzMA flat gel was prepared by UV polymerization of BzMA, crosslinking agent ethylene glycol dimethacrylate (EDMA) and photopolymerization initiator DAROCURE 1173. MMA monomer was diffused into BzMA flat gel from a portion of periphery for several hours. The obtained GRIN material was attached to a mold of commercially available PAL and polymerized by UV. As a result, reduction of astigmatism was confirmed locally in the fabricated PAL and GRIN-PAL using lens meter. In conclusion, GRIN-PAL was successfully fabricated. The validity of GRIN employment for the astigmatism reduction in PAL was demonstrated experimentally.

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Gradient-index contact lens

Cited by 12 publications

References 4 publications

Ray tracing for ophthalmic optics: specific developments for GRIN materials

Ray tracing for ophthalmic optics: specific developments for GRIN materials

Thomas Young's contributions to geometrical optics

Application of polymer graded-index materials for aberration correction of progressive addition lenses

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