Laminate optic with interior Fresnel lens

• US 4,828,558 A
• Filed: 07/28/1987
• Issued: 05/09/1989
• Est. Priority Date: 07/28/1987
• Status: Expired due to Term

• Current Assignee: Ann G. Kelman
• Original Assignee: Charles D. Kelman
• Inventors: Kelman, Charles D.
• Primary Examiner(s): Frinks, Ronald L.
• Application Number:
  US07/078,558
• Time in Patent Office: 651 Days
• Field of Search: 623/6, 351/166, 351/168-172
• US Class Current: 623/6.13
• CPC Class Codes: A61F 2/1648 Multipart lenses
• CPC Class Codes: A61F 2/1656 Fresnel lenses, prisms or plates
• CPC Class Codes: G02B 3/08 with discontinuous faces, e.g. Fresnel lens diffractive Fresnel lenses G02B5/1876
• CPC Class Codes: G02B 5/1876 Diffractive Fresnel lenses; Zone plates; Kinoforms G02B5/1842, G02B5/1847 take precedence; optical systems having diffractive correction means G02B27/0037; Fresnel lenses operating by refraction G02B3/08

Abstract

Composite lens, especially an intraocular lens for insertion through an incision into an eye and desirably containing haptics, comprising a flat, partially hollow laminate optic, formed by a pair of relatively thin, sheet-like elements having opposed interior surfaces, at least one such element constituting a protected Fresnel lens defining the interior surface of the element as a discontinuous surface formation of a concentric series of annular prisms, the interior surfaces being peripherally sealed together to define therebetween a counterpart series of permanent captive gas enclosing, liquid free, spaces of different index of refraction from that of the elements, preferably with the elements being formed of flexible, temporarily deformable material and together sized to provide the optic with a comparatively thin thickness in relation to its diameter, permitting its deformation into a reduced girth cylindrical shape for eye insertion through a minimum size corneal incision, after which the lens will return to its original state for seating in place in the eye.

Claims

1. Composite intraocular lens for insertion through an incision in an eye, which comprises a generally flat, partially hollow, unitary laminate optic, formed by a pair of opposed, relatively thin, sheet-like elements of conforming perimetric shape and of selective index of refraction, and having a corresponding pair of opposed interior surfaces,

at least one of the elements comprising a protected Fresnel lens defining the interior surface of the element as a discontinuous surface formation including a concentric series of annular prisms composed of optical step areas interconnected by offset riser areas, and

the interior surfaces being peripherally sealed together to define therebetween a counterpart concentric series of permanent captive gas enclosing, liquid free, annular spaces of different index of refraction from the selective index of refraction of the elements, and which collectively form a permanently sealed, leakproof, captive gas chamber which internally protects said Fresnel lens from any contact with the surrounding aqueous humor environment in the eye interior.

2. Lens of claim 1 wherein one of the elements comprises a wafer thin Fresnel lens and the other of the elements comprises a wafer thin cover for the Fresnel lens.

3. Lens of claim 1 wherein the two elements comprise coacting wafer thin Fresnel lenses.

4. Lens of claim 1 wherein a slight optical curvature is formed on the exterior of at least one of the elements.

5. Lens of claim 1 wherein the two elements have substantially the same index of refraction.

6. Lens of claim 1 wherein air is enclosed in the annular spaces as captive gas.

7. Lens of claim 1 wherein the elements are formed of flexible, temporarily deformable material.

8. Composite intraocular lens for insertion through an incision in an eye, which comprises a generally flat, partially hollow, unitary laminate optic, formed by a pair of opposed, relatively thin, sheet-like elements of flexible, temporarily deformable material, of conforming perimetric shape and of selective index of refraction, and having a corresponding pair of opposed interior surfaces,

at least one of the elements comprising a protected Fresnel lens defining the interior surface of the element as a discontinuous surface formation including a concentric series of annular prisms composed of optical step areas interconnected by offset riser areas,

the interior surfaces being peripherally sealed together to define therebetween a counterpart concentric series of permanent captive gas enclosing, liquid free, annular spaces of different index of refraction from the selective index of refraction of the elements, and which collectively form a permanently sealed, leakproof, captive gas chamber which internally protects said Fresnel lens from any contact with the surrounding aqueous humor environment in the eye interior, and

the elements together being sized to provide the optic with a comparatively thin thickness in relation to its diameter sufficiently to permit temporary deformation of the optic into a generally cylindrical shape of reduced apparent girth capable of insertion into the eye through a minimum size incision.

9. Lens of claim 8 wherein one of the elements comprises a wafer thin Fresnel lens and the other of the elements comprises a wafer thin cover for the Fresnel lens.

10. Lens of claim 8 wherein the two elements comprise coacting wafer thin Fresnel lenses.

11. Lens of claim 8 wherein a slight optical curvature is formed on the exterior of at least one of the elements.

12. Lens of claim 8 wherein the two elements have substantially the same index of refraction.

13. Lens of claim 8 wherein air is enclosed in the annular spaces as captive gas.

14. Lens of claim 8 wherein the optic has a thickness of at most about 1.5-2 mm and a diameter of at most about 6 mm.

15. Lens of claim 8 wherein the optic is provided with haptics of flexible, temporarily deformable material.