Presbyopia contact lens set

Patent metadata

Field	Value
Publication number	US-9952449-B2
Application number	US-201314906698-A
Country	US
Kind code	B2
Filing date	Aug 1, 2013
Priority date	Aug 1, 2013
Publication date	Apr 24, 2018
Grant date	Apr 24, 2018

Abstract

A presbyopia contact lens set especially for a user who has worn spherical contact lenses, a designing method for a presbyopia contact lens, and a manufacturing method for a presbyopia contact lens that uses such design method. The presbyopia contact lens set configured by combining a plurality of types of presbyopia contact lens having different specifications lens powers, includes the plurality of types of presbyopia contact lenses in which the radial lens power profile in a near-use region and that in a far-use region are defined using mutually different functions, the function for defining the radial lens power profile in the far-use region is set in accordance with a specifications lens power, and the radial lens power rate-of-change in the far-use region is made larger for lenses having a small specifications lens power than for lenses having a large specifications lens power.

First claim

The invention claimed is:

1. A presbyopia contact lens set comprising a plurality of progressive-type presbyopia contact lenses, each lens of the presbyopia contact lens set having an optical zone and different specifications lens powers and comprising:
a near region defined by a center part of the optical zone of the lens, the near region configured to have a radial lens power profile defined by a first function; and
a distance region defined by a peripheral part of the optical zone of the lens, the distance region configured to have a radial lens power profile defined by a second function that is different from the first function, the second function defining the radial lens power profile with the distance region being set for each lens depending on the specifications lens powers with the proviso that the lens set comprises successive lenses of differing specification lens powers including successive lenses of specification lens powers of −2.00 D or smaller and, for each lens of the presbyopia contact lens set having a specifications lens powers of −2.00 D or smaller, a rate-of-change of a radial lens power with the distance region of each successive lens of the group is made larger as the respective specifications lens power is made smaller.

2. The presbyopia contact lens set according to claim 1 , wherein for each lens of the plurality of progressive-type presbyopia contact lenses the rate-of-change of the radial lens power with the distance region is set to have a difference of ±0.2 D/mm or less with respect to a rate-of-change of a radial lens power of a corresponding monofocal spherical contact lens of a same specifications lens power.

3. The presbyopia contact lens set according to claim 1 , wherein for each lens of the plurality of progressive-type presbyopia contact lenses a lens power in the distance region is set to have a difference of ±1.0 D or less with respect to a lens power of a corresponding monofocal spherical contact lens of a same specifications lens power.

4. The presbyopia contact lens set according to claim 1 , wherein for each lens of the plurality of progressive-type presbyopia contact lenses, with each the near region and the distance region, a lens power at an outermost circumference is more negative than a lens power at an innermost circumference, and there is no inflection point at which a rate-of-change of a radial lens power turns positive.

5. The presbyopia contact lens set according to claim 1 , wherein for each lens of the plurality of progressive-type presbyopia contact lenses a difference between a maximum value and a minimum value of a lens power in the distance region is 0.3 D or more.

6. The presbyopia contact lens set according to claim 1 , wherein for each lens of the plurality of progressive-type presbyopia contact lenses a difference between a maximum value and a minimum value of a lens power in the near region is 2.5 D or less.

7. The presbyopia contact lens set according to claim 1 , wherein the plurality of progressive-type presbyopia contact lenses are mutually the same in terms of a difference between a maximum value and a minimum value of a lens power in the near regions.

8. The presbyopia contact lens set according to claim 1 , wherein a diameter of the near region is in the range of 1.0 to 6.0 mm in the plurality of progressive-type presbyopia contact lenses.

9. The presbyopia contact lens set according to claim 1 , wherein for each lens of the plurality of progressive-type presbyopia contact lenses a constant power region where a lens power is fixed at a designated width in a radial direction is provided at an outermost circumference side of the distance region.

10. A designing method of a presbyopia contact lens set comprising a plurality of progressive-type presbyopia contact lenses, each lens including an optical zone having a near region at its center part and a distance region at its peripheral part, the method comprising:
setting a lens power profile for each lens that corresponds to a spherical aberration of a monofocal spherical contact lens of a same specifications lens power as a radial lens power profile in the distance region of the presbyopia contact lens; and
designing each of the plurality of presbyopia contact lenses by different specifications lens powers applied thereto such that the lens set comprises successive lenses of differing specification lens powers including successive lenses of specification lens powers of −2.00 D or smaller and, for each lens of the presbyopia contact lens set having a specifications lens powers of −2.00 D or smaller, a rate-of-change of a radial lens power with the distance region of each successive lens of the group is made larger as the respective specifications lens power is made smaller.

11. The designing method of the presbyopia contact lens set according to claim 10 , wherein for each lens of the plurality of progressive-type presbyopia contact lenses the radial lens power profile in the distance region is set so that a rate-of-change of a radial lens power in the distance region is different from a rate-of-change of a radial lens power of the corresponding monofocal spherical contact lens by ±0.2 D/mm or less.

12. The designing method of the presbyopia contact lens set according to claim 10 , wherein for each lens of the plurality of progressive-type presbyopia contact lenses the lens power profile in the distance region is set so that a radial lens power in the distance region is different from a radial lens power of the corresponding monofocal spherical contact lens by ±1.0 D or less.

13. A manufacturing method of a presbyopia contact lens set comprising forming the progressive-type presbyopia contact lenses of the contact lens set according to the designing method of claim 10 .

Assignees

• Menicon Co Ltd

Inventors

• Goto Yuji
• Yamaguchi Hiroyuki

Classifications

• G02C7/027

  considering wearer's parameters · CPC title

• G02C7/044 Primary

  Annular configuration, e.g. pupil tuned · CPC title

• G02C7/024

  Methods of designing ophthalmic lenses · CPC title

• G02C7/041

  bifocal; multifocal · CPC title

• G02C7/042

  Simultaneous type · CPC title