CA2121973A1 - Multifocal contact lens - Google Patents
Multifocal contact lensInfo
- Publication number
- CA2121973A1 CA2121973A1 CA002121973A CA2121973A CA2121973A1 CA 2121973 A1 CA2121973 A1 CA 2121973A1 CA 002121973 A CA002121973 A CA 002121973A CA 2121973 A CA2121973 A CA 2121973A CA 2121973 A1 CA2121973 A1 CA 2121973A1
- Authority
- CA
- Canada
- Prior art keywords
- lens
- band
- multifocal
- light
- ink
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Abandoned
Links
Classifications
-
- G—PHYSICS
- G02—OPTICS
- G02C—SPECTACLES; SUNGLASSES OR GOGGLES INSOFAR AS THEY HAVE THE SAME FEATURES AS SPECTACLES; CONTACT LENSES
- G02C7/00—Optical parts
- G02C7/12—Polarisers
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/18—Diffraction gratings
- G02B5/1876—Diffractive Fresnel lenses; Zone plates; Kinoforms
-
- G—PHYSICS
- G02—OPTICS
- G02C—SPECTACLES; SUNGLASSES OR GOGGLES INSOFAR AS THEY HAVE THE SAME FEATURES AS SPECTACLES; CONTACT LENSES
- G02C7/00—Optical parts
- G02C7/02—Lenses; Lens systems ; Methods of designing lenses
- G02C7/04—Contact lenses for the eyes
- G02C7/041—Contact lenses for the eyes bifocal; multifocal
- G02C7/042—Simultaneous type
-
- G—PHYSICS
- G02—OPTICS
- G02C—SPECTACLES; SUNGLASSES OR GOGGLES INSOFAR AS THEY HAVE THE SAME FEATURES AS SPECTACLES; CONTACT LENSES
- G02C7/00—Optical parts
- G02C7/02—Lenses; Lens systems ; Methods of designing lenses
- G02C7/04—Contact lenses for the eyes
- G02C7/041—Contact lenses for the eyes bifocal; multifocal
- G02C7/044—Annular configuration, e.g. pupil tuned
-
- G—PHYSICS
- G02—OPTICS
- G02C—SPECTACLES; SUNGLASSES OR GOGGLES INSOFAR AS THEY HAVE THE SAME FEATURES AS SPECTACLES; CONTACT LENSES
- G02C2202/00—Generic optical aspects applicable to one or more of the subgroups of G02C7/00
- G02C2202/20—Diffractive and Fresnel lenses or lens portions
Abstract
MULTIFOCAL CONTACT LENS
ABSTRACT
A multifocal ophthalmic lens has a spiral-like pattern on its surface in an area overlying the cornea of a wearer of the lens. The spiral-like pattern is capable of providing a plurality of different dioptric powers.
(Fig. 3)
ABSTRACT
A multifocal ophthalmic lens has a spiral-like pattern on its surface in an area overlying the cornea of a wearer of the lens. The spiral-like pattern is capable of providing a plurality of different dioptric powers.
(Fig. 3)
Description
2:~21973 .. - 1 -. ..
.~,.
5~V-19541/A/CGV 1702 ..
MULTIFOCAL CONTACT LENS
~:i !, _ '~ BACKGROUND OF THE lNVENTION
. ,~
The present invention relates to an improvement in ~pthalmic lens design and more specifically relates to such a lens which provides bifocal vision.
Presbyopia is a vision defect associated with advancing age. The presbyopic patient lacks - visual accomodation, i.e. the ability of the eye to adjust to clearly see objects that are close A', to or at intermediate distances from the eyç without the aid of a corrective lens.
' The comrnon correction for presbyopia is to use bifocal eyeglasses which have an upper pl)rtion ground for distance viewing, having most commonly, a correction for myopia or ;~ hyperopia, and a lower portion with diopters added for near viewing. However, this -, solu~on does not readily lend itself to contact lenses, which tend to mo~e with the eyeball and disrupt vision. To overcome this problem, bifocal contact lenses have been used which have a shick lower edge which is engaged by the lower eyelid when the wea¢er i looks down, causing the contact lens to slide upwalds vn the c~nea rela~ve to the pupil.
. Such lenses which move lelative to the eye ~e hard to fit because the lens rnust be sized properly to be engaged by the lower lid. Also, dle amount of movement of the lens muse '~ be accurately measured to detelmine the desiredL height of ~e bifocal segment.
There have been a number attempts at providing bifocal lenses which avoid ~e problems of the above-described, thick edged lens. One group of attempts provides a multîfocal dif~active lens constructed by means of a series of concentric, phase manipulating annular rings. The rings provide simultaneous focal powers for near and distant vision having shaIp ~ansitions. A second gr~up of astempts relates to a multifocal ophthalmic lenses having a plurality of concentric rings with a continuously varying power within each zone as well as in transition form one zone to another. The zones are accomplished either by ; con~nuously changing curvatu~e of the postelior surface of the lens, or by crealing non-homogeneous surface characteristics having refractive material indices which ~"
:, i .... ; ,.;: ., ... . - . :, :., . : . . :
`~
i ;
~2 l973 ; - 2 -.
continuously vary in the lens radial direction.
~i ~ A problem exists, however, in that the concentric ~ing con~lguradons described above aTe closed and forrn sealed regions around the cornea. The central portion of the human cornea is a very important optical component to vision. Proper tear flow at the central j-~ portion is critical to corneal health. Contact lenses, especially Ithose which are hydrophilic, conform to the cornea when worn. The closed concentric rings on the lens back profile - isolates tear fîlm in the central co~nea into closed ring shaped channels. Consequently, the tears will only circulate in a small, local area and the comea is not easily Ie~eshed. Also, an increase in debris trapped under the lens, as well as in corneal indentation patterns, is likely t~ occur.
; Therefore, there exists a need for a multi~ocal lens which eliminates the pr~blems inherent in using concentric rings, and mort particularly, which provides for proper tear flow to all parts of the central cornea.
.':
SUMMA~Y OF TH~ INVENIION
The present invention provides a multifocal, such as a bifocal, ophthalmic lens which contains, on at least one of its surfaces, a spiral~ e pattern consisting of a single band , capable of providing a plurality of different dioptric powers. Different dioptrir powers may be created by choosing a cross-sectional band proi;le capable of selecdvely alternadng the angle of impact of light rays on the eye. ~or example, the band may provide a continuous and progressive range of powers, or may provide a discrete set of individual powers. Alterna~vely, the spiral pat~ern may be printed on~o the lens surface t~ achieve a refractive index change profile. In any case, however, ~e spiral pattem ass~s ~at there is a proper iL~w of tears thr~ughout ~e area oi~ the central cornea.
It is an object of the present inven~on, therefore, to provide a bifocal ophthalmic lens which relies on optical phase manipulation for achieving power, but widlout dle physiological disadvantages inherent with closed concent~ic circles.
:`
:
2~3~19'~3 BRIEF DESCRIPTION OF THE DRAW~GS
s Figure 1 is an elevation view of a prior art, closed concentric circle ophthalmic lens.
Figure 2 is a front view of an ophthalmic lens according to the present invention.
.
Pigure 3 is a spiral pattern capable of being used on a lens according to the present invention.
Figure 4 is a cross-sectional view of a band segment shown in Figure 3 taken across line 4-4 which may be used on ~he lens according to the present invention.
Figure 5 is a front view of an ophthalmic lens according to the present invention in which the spiral pattern is comprised of ink.
Figure 6 is a front view of an ophthalmic lens according to the present invention in which the spiral pattern is created by selective polorization of dle lens material.
..
'4 DETAILE~D DPSCRIPIION OF TH~ PREFERRED EME~ODIMENT
., .
Figure 1 illustrated a p~ior art ophthalmic lens 2 having a plurality of closed concen~ic ings 4 alld local areas 6, as described above.
The lens of the present invention may be adapted to be located on the surface of the eye, or may be permanently retained within ~e eye. Figure 2 illus~ates a multifocal contact lens 10 according to the present inven~ion. I~e dimensions of the figores are not intended to be to scale. The lens 10 has a spherical, convex anterior sur~ace 12 and a concave post~rior suIface 14. An aspherical op~cal atea 16 is pr~vided in the middle legion OI the lens 10~ with an annular fitting poItion 18 therearound.
The lens 10 has, on a~ least one of its suri~aces 12, 14~ a spiral~ e pattern consisting of a single band 20 capable of providing a plurality of different dioptric powers. In the example shown in Figure 2, the band 20 is provided on the posterior surface 14. The band 20 begins at a f~rs~ end 22 near dle periphery of the lens 10 and spirals inwar~ly, as a single line, towards the center portion of the lens 10, wherein the band 20 te~milnates at a . , " .. . ... . .
?~
.~;:
,: . :: -':.-: ' .i ~ . , 2~1973 second end 24.
. .
As an example, a multifocal contact lens 10 may include a spiral band 20 pattern which conforms to the following eqoation:
T(x,y)=STEP(S) .
wherein STEP(S) is a step function defined as 1 when S 2 0 and 0 when S< 0 and wherein T=l means light transmission is 100 %, T=0 means light transmission is 0 %;
and wherein S is calculated by the equation S(x,y)=sin[7~-PI2~-(x2~Y2) ~ k-Atan(x/y)+,B]
:
wherein P is the add power (power difference between two extreme foci) desired, ~ is the wavelength of interest, k is a spiral shape control parameter, x and y are the Cartesian coordinates on the lens with the origin located at the center of the lens, and ~ is starting :: `
phase control parameter.
A particular spiral band pattern 20 based upon the above equations is illustrated in Figure 3, wherei~ P=1.5 diopters, ~=555 nm, k=-l and ,B=0. ln o~der tO facilitate the illustration, coordinates are given in Table 1 for four locations a3, b3, d3 and e3 in Figure 3. c3 indicates the second end 24 of ~he pa~ern. Ihis lens creates three ~oci with the add power being 1.5 diopters.
TABLE I
x y Radial Distance Locationcoo~dinate coordinate Meridian From Center ~mm) a30.00000 1.36015 90 1.36015 b3- 1.489~7 0.00000 180 1.48997 d30.00000 - 1.60935 270 1.60935 e31 .72047 0.~)00 360 1 .72047 A variation of the design shown in Figure 3 is possible in which an optical path difference ., ~:i - ., . -, .
.:.,, . ,: :
.-,:. - .
~ ~121973 .
is created between the T=l area and the T=0 area, and the light transmission in the T=Q
area is returned to 100 %. The optical path difference (OPD) is as follows:
I
OPD=(0.5+m)-~
wherein m is any integer number.
.
The creation of the op~ical path difference (OPD) can be realized by a number of ways.
For example, one can design a lens having a given power by choosing a band 2û having a diffraction grating capable of selectively alterna~ing the angle of impact of light rays on the eye. That is, the band 20 may have a cross-sectional profile which imposes on the incident wave of light a predeterrnined periodic vaIiation of amplitude or phase or both.
This may be done by using a band 20 having a cross-sec~ional profile in the form of an undulating curve, shown in Figure 4, or having refractive index change within the band 20.
This concept is discussed in detail in Born, M. and Wolf, E., Principles of Optics~
pp. 401-423 1st Edition (Pergamon Press 1959), as well as U.S. Patent No. 4,898,461 to Portney and U.S. Patent No. 4,~98,461 to Cohen, all incorporated herein by reference.
t , It is also possible to manipulate optical path difference by modifying the spectrum transmission of light within the visible range (about 40û nm to 700 nm). In such instance, the T-1 area set forth above may only pass a first of specZ[rum light (for example, the Red-Yellow range) while the T~ ea may pass a second, different spectrum light (for exarnple, the Green-Blue range). In practice, as shown in Figure 5, the spiral band 20 may be printed onto the surface of the lens using a~ ir~, preferrably one having a Blue-~reen shade. The space 26 between dle band 20 is preferrably left clear.
As shown in Figure 6, another possibility of manipulating ~ptical path difference is to selectively modify the polarization of the lens material. In such instance, the T=l area set forth above may polarize the light going through it into one orientation while the T=0 area may polarize the light going through it into another orientation (preferably being perpendicular to the polarization orientation of the T=l area). For example, T=l area 26 may be polarized at 180 and T-0 is polarized at 90.
~lthough this invention has been described with specific re~erence to the preferred 3 embodiments, it is contemplated that modifications and variations of the procedures set forth will occur to those skilled in the art ~amiliar with the principles herein stated, and .... ~ . ~ ` . .
. .,, . ~ . .
~ .. ..
2:~2:L973 ., 6 ..
that such may be made without departing from the scope of th.ls invention.
., ~ .:
, .,. . -~, ~ ! ' .
.~,.
5~V-19541/A/CGV 1702 ..
MULTIFOCAL CONTACT LENS
~:i !, _ '~ BACKGROUND OF THE lNVENTION
. ,~
The present invention relates to an improvement in ~pthalmic lens design and more specifically relates to such a lens which provides bifocal vision.
Presbyopia is a vision defect associated with advancing age. The presbyopic patient lacks - visual accomodation, i.e. the ability of the eye to adjust to clearly see objects that are close A', to or at intermediate distances from the eyç without the aid of a corrective lens.
' The comrnon correction for presbyopia is to use bifocal eyeglasses which have an upper pl)rtion ground for distance viewing, having most commonly, a correction for myopia or ;~ hyperopia, and a lower portion with diopters added for near viewing. However, this -, solu~on does not readily lend itself to contact lenses, which tend to mo~e with the eyeball and disrupt vision. To overcome this problem, bifocal contact lenses have been used which have a shick lower edge which is engaged by the lower eyelid when the wea¢er i looks down, causing the contact lens to slide upwalds vn the c~nea rela~ve to the pupil.
. Such lenses which move lelative to the eye ~e hard to fit because the lens rnust be sized properly to be engaged by the lower lid. Also, dle amount of movement of the lens muse '~ be accurately measured to detelmine the desiredL height of ~e bifocal segment.
There have been a number attempts at providing bifocal lenses which avoid ~e problems of the above-described, thick edged lens. One group of attempts provides a multîfocal dif~active lens constructed by means of a series of concentric, phase manipulating annular rings. The rings provide simultaneous focal powers for near and distant vision having shaIp ~ansitions. A second gr~up of astempts relates to a multifocal ophthalmic lenses having a plurality of concentric rings with a continuously varying power within each zone as well as in transition form one zone to another. The zones are accomplished either by ; con~nuously changing curvatu~e of the postelior surface of the lens, or by crealing non-homogeneous surface characteristics having refractive material indices which ~"
:, i .... ; ,.;: ., ... . - . :, :., . : . . :
`~
i ;
~2 l973 ; - 2 -.
continuously vary in the lens radial direction.
~i ~ A problem exists, however, in that the concentric ~ing con~lguradons described above aTe closed and forrn sealed regions around the cornea. The central portion of the human cornea is a very important optical component to vision. Proper tear flow at the central j-~ portion is critical to corneal health. Contact lenses, especially Ithose which are hydrophilic, conform to the cornea when worn. The closed concentric rings on the lens back profile - isolates tear fîlm in the central co~nea into closed ring shaped channels. Consequently, the tears will only circulate in a small, local area and the comea is not easily Ie~eshed. Also, an increase in debris trapped under the lens, as well as in corneal indentation patterns, is likely t~ occur.
; Therefore, there exists a need for a multi~ocal lens which eliminates the pr~blems inherent in using concentric rings, and mort particularly, which provides for proper tear flow to all parts of the central cornea.
.':
SUMMA~Y OF TH~ INVENIION
The present invention provides a multifocal, such as a bifocal, ophthalmic lens which contains, on at least one of its surfaces, a spiral~ e pattern consisting of a single band , capable of providing a plurality of different dioptric powers. Different dioptrir powers may be created by choosing a cross-sectional band proi;le capable of selecdvely alternadng the angle of impact of light rays on the eye. ~or example, the band may provide a continuous and progressive range of powers, or may provide a discrete set of individual powers. Alterna~vely, the spiral pat~ern may be printed on~o the lens surface t~ achieve a refractive index change profile. In any case, however, ~e spiral pattem ass~s ~at there is a proper iL~w of tears thr~ughout ~e area oi~ the central cornea.
It is an object of the present inven~on, therefore, to provide a bifocal ophthalmic lens which relies on optical phase manipulation for achieving power, but widlout dle physiological disadvantages inherent with closed concent~ic circles.
:`
:
2~3~19'~3 BRIEF DESCRIPTION OF THE DRAW~GS
s Figure 1 is an elevation view of a prior art, closed concentric circle ophthalmic lens.
Figure 2 is a front view of an ophthalmic lens according to the present invention.
.
Pigure 3 is a spiral pattern capable of being used on a lens according to the present invention.
Figure 4 is a cross-sectional view of a band segment shown in Figure 3 taken across line 4-4 which may be used on ~he lens according to the present invention.
Figure 5 is a front view of an ophthalmic lens according to the present invention in which the spiral pattern is comprised of ink.
Figure 6 is a front view of an ophthalmic lens according to the present invention in which the spiral pattern is created by selective polorization of dle lens material.
..
'4 DETAILE~D DPSCRIPIION OF TH~ PREFERRED EME~ODIMENT
., .
Figure 1 illustrated a p~ior art ophthalmic lens 2 having a plurality of closed concen~ic ings 4 alld local areas 6, as described above.
The lens of the present invention may be adapted to be located on the surface of the eye, or may be permanently retained within ~e eye. Figure 2 illus~ates a multifocal contact lens 10 according to the present inven~ion. I~e dimensions of the figores are not intended to be to scale. The lens 10 has a spherical, convex anterior sur~ace 12 and a concave post~rior suIface 14. An aspherical op~cal atea 16 is pr~vided in the middle legion OI the lens 10~ with an annular fitting poItion 18 therearound.
The lens 10 has, on a~ least one of its suri~aces 12, 14~ a spiral~ e pattern consisting of a single band 20 capable of providing a plurality of different dioptric powers. In the example shown in Figure 2, the band 20 is provided on the posterior surface 14. The band 20 begins at a f~rs~ end 22 near dle periphery of the lens 10 and spirals inwar~ly, as a single line, towards the center portion of the lens 10, wherein the band 20 te~milnates at a . , " .. . ... . .
?~
.~;:
,: . :: -':.-: ' .i ~ . , 2~1973 second end 24.
. .
As an example, a multifocal contact lens 10 may include a spiral band 20 pattern which conforms to the following eqoation:
T(x,y)=STEP(S) .
wherein STEP(S) is a step function defined as 1 when S 2 0 and 0 when S< 0 and wherein T=l means light transmission is 100 %, T=0 means light transmission is 0 %;
and wherein S is calculated by the equation S(x,y)=sin[7~-PI2~-(x2~Y2) ~ k-Atan(x/y)+,B]
:
wherein P is the add power (power difference between two extreme foci) desired, ~ is the wavelength of interest, k is a spiral shape control parameter, x and y are the Cartesian coordinates on the lens with the origin located at the center of the lens, and ~ is starting :: `
phase control parameter.
A particular spiral band pattern 20 based upon the above equations is illustrated in Figure 3, wherei~ P=1.5 diopters, ~=555 nm, k=-l and ,B=0. ln o~der tO facilitate the illustration, coordinates are given in Table 1 for four locations a3, b3, d3 and e3 in Figure 3. c3 indicates the second end 24 of ~he pa~ern. Ihis lens creates three ~oci with the add power being 1.5 diopters.
TABLE I
x y Radial Distance Locationcoo~dinate coordinate Meridian From Center ~mm) a30.00000 1.36015 90 1.36015 b3- 1.489~7 0.00000 180 1.48997 d30.00000 - 1.60935 270 1.60935 e31 .72047 0.~)00 360 1 .72047 A variation of the design shown in Figure 3 is possible in which an optical path difference ., ~:i - ., . -, .
.:.,, . ,: :
.-,:. - .
~ ~121973 .
is created between the T=l area and the T=0 area, and the light transmission in the T=Q
area is returned to 100 %. The optical path difference (OPD) is as follows:
I
OPD=(0.5+m)-~
wherein m is any integer number.
.
The creation of the op~ical path difference (OPD) can be realized by a number of ways.
For example, one can design a lens having a given power by choosing a band 2û having a diffraction grating capable of selectively alterna~ing the angle of impact of light rays on the eye. That is, the band 20 may have a cross-sectional profile which imposes on the incident wave of light a predeterrnined periodic vaIiation of amplitude or phase or both.
This may be done by using a band 20 having a cross-sec~ional profile in the form of an undulating curve, shown in Figure 4, or having refractive index change within the band 20.
This concept is discussed in detail in Born, M. and Wolf, E., Principles of Optics~
pp. 401-423 1st Edition (Pergamon Press 1959), as well as U.S. Patent No. 4,898,461 to Portney and U.S. Patent No. 4,~98,461 to Cohen, all incorporated herein by reference.
t , It is also possible to manipulate optical path difference by modifying the spectrum transmission of light within the visible range (about 40û nm to 700 nm). In such instance, the T-1 area set forth above may only pass a first of specZ[rum light (for example, the Red-Yellow range) while the T~ ea may pass a second, different spectrum light (for exarnple, the Green-Blue range). In practice, as shown in Figure 5, the spiral band 20 may be printed onto the surface of the lens using a~ ir~, preferrably one having a Blue-~reen shade. The space 26 between dle band 20 is preferrably left clear.
As shown in Figure 6, another possibility of manipulating ~ptical path difference is to selectively modify the polarization of the lens material. In such instance, the T=l area set forth above may polarize the light going through it into one orientation while the T=0 area may polarize the light going through it into another orientation (preferably being perpendicular to the polarization orientation of the T=l area). For example, T=l area 26 may be polarized at 180 and T-0 is polarized at 90.
~lthough this invention has been described with specific re~erence to the preferred 3 embodiments, it is contemplated that modifications and variations of the procedures set forth will occur to those skilled in the art ~amiliar with the principles herein stated, and .... ~ . ~ ` . .
. .,, . ~ . .
~ .. ..
2:~2:L973 ., 6 ..
that such may be made without departing from the scope of th.ls invention.
., ~ .:
, .,. . -~, ~ ! ' .
Claims (15)
1. A multifocal ophthalmic lens having a spiral-like pattern on its surface in an area overlying the cornea of a wearer of the lens, said spiral-like pattern capable of providing a plurality of different dioptric powers.
2. The multifocal ophthalmic lens of claim 1, wherein said spiral-like pattern follows the equation:
T(x,y)=STEP(S) wherein STEP(S) is a step function defined as 1 when S ? 0 and 0 when S < 0 and wherein T=1 means light transmission is 100 %, T=0 means light transmission is 0 %;
and wherein S is calculated by the equation S(x,y)=sin[.pi.P/22-(x2+Y2) + k-Atan(x/y)+.beta.]
wherein P is the add power (power difference between two extreme foci) desired, .lambda. is the wavelength of interest, k is a spiral shape control parameter, x and y are the Cartesian coordinates on the lens with the origin located at the center of the lens, and .beta. is starting phase control parameter.
T(x,y)=STEP(S) wherein STEP(S) is a step function defined as 1 when S ? 0 and 0 when S < 0 and wherein T=1 means light transmission is 100 %, T=0 means light transmission is 0 %;
and wherein S is calculated by the equation S(x,y)=sin[.pi.P/22-(x2+Y2) + k-Atan(x/y)+.beta.]
wherein P is the add power (power difference between two extreme foci) desired, .lambda. is the wavelength of interest, k is a spiral shape control parameter, x and y are the Cartesian coordinates on the lens with the origin located at the center of the lens, and .beta. is starting phase control parameter.
3. The multifocal ophthalmic lens of claim 1, wherein the spiral-like pattern is a comprised band forming a diffraction grating capable of alternating the angle of impact of light rays.
4. The multifocal lens of claim 3, wherein the band has a cross-sectional profile in the form of an undulating curve.
5. The multifocal lens of claim 3, wherein the band is capable of modifying the spectrum transmission of light within the visible range.
6. The multifocal lens of claim 5, wherein the band is comprised of ink provided onto a surface of the lens, said ink being capable of modifying the spectrum transmission of light within the visible range.
7. The multifocal lens of claim 5, wherein the band is comprised of ink provided onto a surface of the lens and the spaces between the band is clear.
8. The multifocal lens of claim 5, wherein the band is comprised of a first ink capable of transmitting a first range of spectrum light and the space between the band is a second ink capable of transmitting a second range of spectrum light different from the first range of spectrum light.
9. The multifocal lens of claim 6, wherein the ink transmits light in the Red-Yellow range.
10. The multifocal lens of claim 8, wherein the first ink transmits light in the Red-Yellow range.
11. The multifocal lens of claim 10, wherein the second ink transmits light in the Green-Blue range.
12. The multifocal lens of claim 5, wherein the band is comprised of selectively polarized areas of lens material.
13. The multifocal lens of claim 5, wherein the band is comprised of selective areas of lens material having different refractive indexes.
14. The multifocal lens of claim 1, wherein the lens is adapted to be located on the surface of the eye.
15. The multifocal lens of claim 1, wherein the lens is adapted to be permanently retained within the eye.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US08/053,122 US5408281A (en) | 1993-04-26 | 1993-04-26 | Multifocal contact lens |
| US08/53122 | 1993-04-26 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2121973A1 true CA2121973A1 (en) | 1994-10-27 |
Family
ID=21982075
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002121973A Abandoned CA2121973A1 (en) | 1993-04-26 | 1994-04-22 | Multifocal contact lens |
Country Status (17)
| Country | Link |
|---|---|
| US (1) | US5408281A (en) |
| EP (1) | EP0622653B1 (en) |
| JP (1) | JPH06324292A (en) |
| AT (1) | ATE160885T1 (en) |
| AU (1) | AU682337B2 (en) |
| CA (1) | CA2121973A1 (en) |
| DE (1) | DE69407087T2 (en) |
| DK (1) | DK0622653T3 (en) |
| ES (1) | ES2109645T3 (en) |
| FI (1) | FI941888A (en) |
| GR (1) | GR3025766T3 (en) |
| HK (1) | HK1002540A1 (en) |
| IL (2) | IL109375A0 (en) |
| NO (1) | NO307277B1 (en) |
| NZ (1) | NZ260378A (en) |
| TW (1) | TW219392B (en) |
| ZA (1) | ZA942807B (en) |
Families Citing this family (85)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5929969A (en) * | 1995-05-04 | 1999-07-27 | Johnson & Johnson Vision Products, Inc. | Multifocal ophthalmic lens |
| US5764339A (en) * | 1996-10-03 | 1998-06-09 | Medical University Of South Carolina | Compressive force-activated variable focus lens and method of making the same |
| IL129455A (en) * | 1999-04-15 | 2003-07-06 | Mvt Multi Vision Technologies | Timepieces |
| US6463012B1 (en) | 1997-06-05 | 2002-10-08 | M.V.T. Multi Vision Technologies Ltd. | Timepieces |
| US5980040A (en) * | 1997-06-30 | 1999-11-09 | Wesley Jessen Corporation | Pinhole lens and contact lens |
| WO2000008516A1 (en) | 1998-08-06 | 2000-02-17 | Lett John B W | Multifocal aspheric lens |
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-
1993
- 1993-04-26 IL IL10937593A patent/IL109375A0/en unknown
- 1993-04-26 US US08/053,122 patent/US5408281A/en not_active Expired - Lifetime
- 1993-07-17 TW TW082105697A patent/TW219392B/en active
-
1994
- 1994-04-18 ES ES94810217T patent/ES2109645T3/en not_active Expired - Lifetime
- 1994-04-18 DE DE69407087T patent/DE69407087T2/en not_active Expired - Fee Related
- 1994-04-18 AT AT94810217T patent/ATE160885T1/en active
- 1994-04-18 DK DK94810217T patent/DK0622653T3/en active
- 1994-04-18 EP EP94810217A patent/EP0622653B1/en not_active Expired - Lifetime
- 1994-04-19 JP JP6080378A patent/JPH06324292A/en active Pending
- 1994-04-21 AU AU60640/94A patent/AU682337B2/en not_active Ceased
- 1994-04-21 IL IL109375A patent/IL109375A/en not_active IP Right Cessation
- 1994-04-22 CA CA002121973A patent/CA2121973A1/en not_active Abandoned
- 1994-04-22 NZ NZ260378A patent/NZ260378A/en unknown
- 1994-04-22 FI FI941888A patent/FI941888A/en unknown
- 1994-04-22 ZA ZA942807A patent/ZA942807B/en unknown
- 1994-04-25 NO NO941501A patent/NO307277B1/en not_active IP Right Cessation
-
1997
- 1997-12-23 GR GR970403417T patent/GR3025766T3/en unknown
-
1998
- 1998-02-26 HK HK98101478A patent/HK1002540A1/en not_active IP Right Cessation
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|---|---|
| GR3025766T3 (en) | 1998-03-31 |
| IL109375A0 (en) | 1994-07-31 |
| JPH06324292A (en) | 1994-11-25 |
| ATE160885T1 (en) | 1997-12-15 |
| DE69407087D1 (en) | 1998-01-15 |
| NO941501D0 (en) | 1994-04-25 |
| TW219392B (en) | 1994-01-21 |
| NO307277B1 (en) | 2000-03-06 |
| NO941501L (en) | 1994-10-27 |
| NZ260378A (en) | 1997-08-22 |
| DE69407087T2 (en) | 1998-05-14 |
| US5408281A (en) | 1995-04-18 |
| DK0622653T3 (en) | 1998-08-10 |
| FI941888A0 (en) | 1994-04-22 |
| IL109375A (en) | 1998-03-10 |
| EP0622653B1 (en) | 1997-12-03 |
| AU682337B2 (en) | 1997-10-02 |
| ES2109645T3 (en) | 1998-01-16 |
| FI941888A (en) | 1994-10-27 |
| EP0622653A1 (en) | 1994-11-02 |
| HK1002540A1 (en) | 1998-08-28 |
| AU6064094A (en) | 1994-10-27 |
| ZA942807B (en) | 1994-10-27 |
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