LENS ASSEMBLY FOR DEPTH OF FOCUS
An intraocular lens assembly for increased depth of focus has a frame configurated to vault posteriorly in an eye and an optic attached thereto. Pressure from ciliary muscle contraction moves the optic anteriorly to focus the eye for near vision.
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This application is a division of U.S. application Ser. No. 10/856,313 filed May 27, 2004, which claims priority to U.S. application Ser. No. 09/574,441 filed May 19, 2000, now U.S. Pat. No. 6,849,091, the disclosure of which is fully incorporated herein by reference.
BACKGROUND OF THE INVENTIONThe natural human lens provides only limited depth of focus, with clear vision only over a limited range of distance.
The present invention provides increased depth of focus by positioning an optic posteriorly in the eye by disposing it on a substantially rigid frame which is configurated to vault posteriorly, thus enabling accurate viewing over a wider range of distances with greater distance between the cornea and the optic, and the further posteriorly the positioning of the optic, the higher the power of the optic, and the less the lens movement required for a given power change.
The frame may preferably have plate haptics with transversely extending loops at the outer ends of the haptics to engage peripheral portions of the capsular bag of the eye and center the lens. The haptics may preferably be such as that shown and described in U.S. Pat. No. 6,051,024, “Intraocular Lenses with Fixated Haptics”.
The optic utilized with the invention is substantially smaller than the natural human lens. Whereas the natural human lens is about 5.0 mm in thickness, an optic utilized with the invention may typically be 1.0 mm, and may range between 0.5 mm and 1.5 mm. The optic may preferably be similar to that shown and described in Applicant's application Ser. No. 09/370,235, “Lens For Increased Depth of Focus.”
The present invention provides increased depth of focus by providing a relatively rigid frame with haptics extending oppositely to engage a perimeter or equator of a capsular bag, and having a central opening to accommodate an optic engaged on the frame and movable anteriorly relative to the frame.
Referring to
A lens 30 comprises an optic 32 from which extend relatively short extensions 34, 36 which terminate in generally cylindrical ridges 38, 40. The ridges are adapted to be engaged and retained in the slots 24, 26, as shown in
In the modified form of
In
The optic 32 is thinner than a natural optic of a human eye and may have a thickness between 0.50 mm and 1.5 mm and may typically be about 1.0 mm thickness. The optic may typically be similar to that shown and described in the above-mentioned application of Applicant.
In operation, the optic 32 is movable anteriorly of the eye under vitreous pressure upon constriction of the ciliary muscle. The contraction of the muscle produces vitreous pressure which tends to urge the optic toward or into the hole 14 of the frame. The optic typically need not extend through the opening 14, but only extend about 1.0 mm into the opening. The optic need only move 1.0 mm to effect a change of 1.5 to 2.0 diopters of power change. The relatively rigid frame and the vitreous pressure thus effect optic movement relative to the frame.
It may be noted that an advantage of the present invention is that utilization of the relatively rigid frame substantially eliminates need for administration to a patient of a substance such as atropine during a period following surgery. This eliminates a problem in practice relative to patients not taking atropine, as instructed, during a period following surgery in order to maintain the ciliary muscle in a relaxed condition during fibrosis relative to end portions of haptics.
The transversely extending loops 20, 22 provide centration and to facilitate fixation of the optic in the general manner described in U.S. Pat. No. 6,051,024, entitled “Intraocular Lenses With Fixated Haptics”.
The frame 10 may typically be formed of PMMA, polycarbonate, nylon, other relatively rigid material, platinum or gold. The lens 30 may preferably be formed of a flexible optical material, such as silicone, acrylic, HENNA, hydrogel, etc.
To provide for the bending or folding of the frame, as shown in
Referring to
Referring to
It will be understood that various changes and modifications may be made from the preferred embodiments discussed above without departing from the scope of the present invention, which is established by the following claims and equivalents thereof.
Claims
1. An intraocular lens assembly for increased depth of focus, comprising:
- a frame having haptics extending oppositely and longitudinally, said haptics having lateral edges disposed on an outer periphery of the frame, said frame being configurated to vault posteriorly in an eye of a person,
- said frame having end portions to engage in the periphery of the capsular bag of an eye,
- said frame defining a generally circular opening disposed through said frame, said opening positioned between inner portions of said haptics, an optic sized and configurated to engage in an edge portion of said frame opening, and interengaging features on the frame and on the optic for attachment of the optic to the frame for limited optic movement relative to the frame, said interengaging features comprising transverse slots in the frame spaced oppositely from said opening, and mounting portions extending oppositely from the optic and having transverse ridges at end portions thereof for retention in the slots, at least one of said slots having a widened portion with slot end shoulders to retain at least one of said ridges for prevention of optic lateral movement, and a notch extending from each of said slots toward said frame opening for facilitating the folding of the frame for insertion thereof through a slit in an eye,
- whereby light refracted by the cornea of the eye travels an increased distance to the optic to substantially increase depth of focus.
2. An intraocular lens assembly for increased depth of focus, comprising:
- a frame having haptics extending oppositely and longitudinally, said haptics having lateral edges disposed on an outer periphery of the frame, said frame being configurated to vault posteriorly in an eye of a person,
- said frame having end portions to engage in the periphery of the capsular bag of an eye,
- said frame defining a generally circular opening disposed through said frame, said opening positioned between inner portions of said haptics,
- an optic sized and configurated to engage in an edge portion of said frame opening, and
- interengaging features on the frame and on the optic for attachment of the optic to the frame for limited optic movement relative to the frame, said interengaging features comprising transverse slots in the frame spaced oppositely from said opening, and mounting portions extending oppositely from the optic and having transverse ridges at end portions thereof for retention in the slots, at least one of said slots has a widened portion with slot and end shoulders to retain at least one of said ridges for prevention of topic lateral movement, and a portion of the haptic between each slot and said frame opening having a reduced longitudinal dimension to facilitate folding of the frame longitudinally for insertion of the frame through a slit in an eye,
- whereby light refracted by the cornea of the eye travels an increased distance to the optic to substantially increase depth of focus.
3. An intraocular lens assembly for increased depth of focus, comprising:
- a frame of generally rigid material and configurated to vault posteriorly in an eye of a person, said frame having haptics extending oppositely and longitudinally, said haptics having lateral edges disposed on the outer periphery of the frame,
- said frame defining a central generally circular opening disposed through said frame,
- said frame having transverse slots spaced oppositely from said frame opening, and
- an optic adapted to be disposed adjacent said frame opening, said optic having mounting portions extending oppositely therefrom for engagement in said frame slots to retain the optic relative to the frame, said optic mounting portions extending oppositely from the optic having transverse ridges at end portions thereof for retention in the slots, and
- a notch extending from at least one of said slots toward said frame opening to facilitate folding of the frame for insertion thereof through a slit in an eye,
- whereby light refracted by the cornea of the eye travels an increased distance to the optic to substantially increase depth of focus.
4. An intraocular lens assembly for increased depth of focus, comprising:
- a frame of generally rigid material and configurated to vault posteriorly in an eye of a person, said frame having haptics extending oppositely and longitudinally, said haptics having lateral edges disposed on the outer periphery of the frame,
- said frame defining a central generally circular opening disposed through said frame,
- said frame having transverse slots spaced oppositely from said frame opening, and
- an optic adapted to be disposed adjacent said frame opening, said optic having mounting portions extending oppositely therefrom for engagement in said frame slots to retain the optic relative to the frame, said optic mounting portions extending oppositely from the optic having transverse ridges at end portions thereof for retention in the slots, and a notch extending from each of said slots toward said frame opening for facilitating the folding of the frame for insertion thereof through a slit in an eye,
- whereby light refracted by the cornea of the eye travels an increased distance to the optic to substantially increase depth of focus.
5. An intraocular lens assembly for increased depth of focus, comprising:
- a frame of generally rigid material and configurated to vault posteriorly in an eye of a persion, said frame having haptics extending oppositely and longitudinally, said haptics having lateral edges disposed on the outer periphery of the frame,
- said frame defining a central generally circular opening disposed through said frame,
- said frame having transverse slots spaced oppositely from said frame opening, and
- an optic adapted to be disposed adjacent said frame opening, said optic having mounting portions extending oppositely therefrom for engagement in said frame slots to retain the optic relative to the frame, said optic mounting portions extending oppositely from the optic having transverse ridges at end portions thereof for retention in the slots, and a portion of the haptic between each of said slots and said frame opening having a reduced longitudinal dimension to facilitate folding of the frame longitudinally for insertion of the frame through a slit in an eye,
- whereby light refracted by the cornea of the eye travels an increased distance to the optic to substantially increase depth of focus.
6. An intraocular lens assembly for increased depth of focus, comprising:
- a frame of generally rigid material and configurated to vault posteriority in an eye of a person, said frame having haptics extending oppositely and longitudinally, said haptics having lateral edges disposed on the outer periphery of the frame,
- said frame defining a central generally circular opening disposed through said frame,
- said frame having transverse slots spaced oppositely from said frame opening, and
- an optic adapted to be disposed adjacent said frame opening, said optic having mounting portions extending oppositely therefrom for engagement in said frame slots to retain the optic relative to the frame wherein an enlarged opening is defined in each of said haptics, and extends into proximity with said slots to define a substantially narrow hinge portion to substantially narrow haptic portions to facilitate bending of the lens along its longitudinal axis,
- whereby light refracted by the cornea of the eye travels an increased distance to the optic to substantially increase depth of focus.
7. An intraocular lens assembly for increased depth of focus, comprising:
- a pair of relatively rigid spaced-apart frame members adapted for engagement with the periphery of a capsular bag of the eye, said pair of frame members disposed oppositely and longitudinally about said optic, said frame members having end portions extending oppositely and transversely to engage in the peripheral portions of the capsular bag, said frame members having lateral edges disposed on the outer periphery of the frame members, and
- a web secured to and extending between said frame members and having thereon an optic, the web having portions extending oppositely from the optic, the web portions being bifurcated and having lugs and loops thereon, and said frame members having slits defined therein to receive the lugs of the web portions, and the lugs and loops being generally disposed equidistant from a center of the optic.
8. An intraocular lens assembly according to claim 1, wherein said lens assembly is foldable longitudinally through the optic but rigid in each of the two haptics.
Type: Application
Filed: Oct 31, 2007
Publication Date: Nov 13, 2008
Applicant:
Inventor: J. Stuart Cumming (Laguna Beach, CA)
Application Number: 11/933,045
International Classification: A61F 2/16 (20060101);