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Intraocular lens and associated design and modeling methods

A technology of intraocular lens and main body, which is applied in depth-of-focus IOL and related fields, and can solve problems such as not being able to provide energy with degrees of freedom

Active Publication Date: 2019-03-15
河南赛美视生物科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] None of the existing design methods for diffractive multifocal IOLs provide complete freedom to manipulate the phase distribution on the diffractive surface into the energy distribution among usable diffraction orders and minimize the energy reaching unusable diffraction orders.

Method used

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  • Intraocular lens and associated design and modeling methods
  • Intraocular lens and associated design and modeling methods
  • Intraocular lens and associated design and modeling methods

Examples

Experimental program
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Effect test

example 1

[0063] Example 1 (Method I)

[0064] A bifocal IOL with 3.0 diopter (D) add power corresponds to the far focus and the near focus, respectively. This design form has a diffractive structure with a consistent surface area ratio R for each diffractive region m , and uniformly (monotonically) reduces the diffraction efficiency (ie, uniformly (monotonically) reduces the step height). Table 2 and Figure 3A -7D discloses and shows design parameters and performance predictions.

[0065] The bifocal IOL is designed with 3.0D add power. This design form includes A-type and B-type designs. Such as Figure 3A As shown, the Type A design has a consistent 45.5% / 35.8% energy distribution between the far and near foci at all pupil sizes. Such as Figure 3B As shown, for the central 3mm region, type B has a consistent far / near energy distribution of 45.5% / 35.8%, and the energy distribution changes gradually and uniformly for pupil sizes larger than 3mm, where more energy is directed t...

example 2

[0084] Example 2 (Method II)

[0085] Trifocal IOLs with 1.75D and 3.5D add powers correspond to far focus, intermediate focus and near focus, respectively. This design form has a diffractive structure with a consistent surface area ratio for each diffractive region, but different diffractive efficiencies (alternating high and low step heights) for adjacent regions. Table 3 and Figures 8A-12 disclose and illustrate design parameters and performance predictions.

[0086] Trifocal IOLs are designed with two different add powers; eg, 1.75D and 3.50D, to provide distance, intermediate, and near vision. Similar to Example 1, this design form may include Type A and Type B designs. The Type A design had consistent energy distributions of 37.2%, 25.3%, and 23.7% between far, intermediate, and near foci at all pupil sizes. Type B has a consistent far / intermediate / near energy distribution of 37.2% / 25.3% / 23.7% for only the central 3mm region, but gradually changes energy distribution ...

example 3

[0104] Example 3 (Method III)

[0105] Extended depth of focus IOLs (EDOF IOLs) have a continuous depth of focus extending to greater than 2.5D (compared to the 0.5D maximum of conventional refractive IOLs). The design form has a diffractive structure with a symmetrical dual blaze phase structure (back to back), consistent surface area ratio, and consistent maximum phase deviation within each diffractive region. Table 4 and Figure 13-15 Design parameters and performance predictions are disclosed and shown.

[0106] EDOF IOLs are designed to have a depth of focus that extends beyond 2.5D. Figure 13 The discrete surface phase profiles are shown, and Table 4 shows the specified design parameters for ring position and step height at the trailing edge of the ring. The parameters specified in Table 4 apply specifically to materials with a refractive index of 1.52 at a wavelength of 550 nm. For materials with other refractive indices, the step height will need to be adjusted as...

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Abstract

A multifocal IOL (M-IOL) has a phase-altering characteristic that can control the diffraction and interference of light propagating there through to effect multifocality and extended depth of focus (EDOF). The embodied IOLs include engineered, discrete phase profiles on one or both of the anterior and posterior surfaces of the lens to intentionally manipulate the light in a designated manner. A design method for defining the discrete phase profile on the lens surface. The engineered phase profile is constructed by concentric annular zones having an abrupt step jump at the trailing circumferential edge of each zone. An optical modeling method to simulate the optical performance of the embodied IOLs in an optical ray tracing environment.

Description

[0001] relevant application data [0002] This immediate application claims priority to U.S. Provisional Applications S / N 62 / 332186, filed May 5, 2016, and S / N 62 / 332675, filed May 6, 2016, the subject matter of which is hereby incorporated by reference in its entirety . Background technique [0003] Aspects and embodiments of the present invention relate to intraocular lenses (IOLs) and methods for designing and modeling IOLs; more particularly to multifocal and / or extended depth of focus (EDOF) IOLs and associated methods; Most particularly to such IOLs with discrete surface phase structures enabling multifocal and / or EDOF and associated methods. [0004] Multifocal IOLs exhibit multiple different optical powers that optically simultaneously focus images on the user's retina for objects at different distances. Extended depth of focus (EDOF) IOLs provide an extended range over which a subject scene can be viewed in focus, compared to that provided by a monofocal IOL. This ...

Claims

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Application Information

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IPC IPC(8): G02B3/10G02B27/09A61F2/16
CPCG02B3/10A61F2/1618A61F2/1654G02B3/08G02C7/042G02C2202/20A61F2240/001A61F2/1656
Inventor 谢继红
Owner 河南赛美视生物科技有限公司
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