Patent Abstract:
An intraocular lens has a lesser dimension longitudinally of haptics attached thereto than in the longitudinal direction to provide increased posterior vaulting for accommodation.

Full Description:
BACKGROUND AND SUMMARY OF THE INVENTION 
     The natural human lens effects accommodation, as between near and far vision, by ciliary muscle contraction and relaxation under brain control to dispose the lens in varying thicknesses at various locations along the axis of the eye. 
     The present invention provides improved, increased posterior vaulting of a lens optic by elongation of haptics disposed oppositely of the optic, while reducing the optic dimension in the longitudinal direction of the haptics. 
     Referring to FIG. 2 of the drawings, wherein the natural capsular bag is omitted for clarity, it will be understood from the geometrical relations of the ciliary muscle, the haptics and the optic, that the more elongated the haptics, the greater the posterior vaulting of lens haptics for accommodation. 
     The present invention provides an intraocular accommodating lens wherein an asymmetrical optic is of substantially greater dimension transversely of the longitudinal direction of haptics extending therefrom, and is of lesser dimension in the longitudinal direction of the haptics. With each haptic elongated to extend be tween the capsular bag equator and the optic, increased posterior vaulting of the optic is provided. 
    
    
     BRIEF DESCRIPTION OF THE DRAWINGS 
     FIG. 1 is an elevational view of a preferred form of accommodating lens according to the invention; 
     FIG. 2 is a sectional view of the lens of FIG. 1 disposed in an eye, showing the lens optic in a generally anterior position and in a posteriorly vaulted position; 
     FIG. 3 is an elevational view of another preferred embodiment; 
     FIG. 4 is an elevational view of another embodiment; and 
     FIG. 5 is an elevational view of another embodiment wherein a generally annular glare-reducing component is disposed about an optic. 
    
    
     DESCRIPTION OF THE PREFERRED EMBODIMENT 
     Referring to the drawings, particularly FIGS. 1 and 2, a preferred embodiment  10  of the accommodating lens of the invention is shown as comprising an optic  12  and haptics  14 ,  16  extending oppositely therefrom and having loops  18  extending transversely thereof for engagement in the equator or rim of a capsular bag of an eye. 
     As shown, the lens is shortened in the longitudinal direction of haptics  14 ,  16  extension and elongated in the transverse direction, and the haptics are elongated in the longitudinal direction. From the geometry of the features and components, including the ciliary muscle  20 , the haptics and the optic, it will be understood that the elongated haptics provide increased posterior vaulting of the optic, as indicated in FIG.  2 . 
     The optic thus has a somewhat oval configuration, with flat straight portions  21 , 22  hinged to the haptics. 
     The lens of the invention provides improved, enhanced accommodation by increased posterior vaulting of the optic, while maintaining a maximal optical zone for accurate vision. 
     The optic  12 , while relatively wide and enlarged in the direction transverse to the longitudinal direction of the haptics, and relatively short in the longitudinal direction, nevertheless has a full optical zone to provide full optical effect transmitted to the retina of the eye. 
     Whereas artificial intraocular lenses typically have optical zones of less than 5.0 mm in diameter, particularly lenses with haptics staked into optics, the present invention provides optical zones of about 6.0 mm transversely and about 4.5 mm longitudinally. 
     FIGS. 3 and 4 show embodiments of the invention wherein generally circular optics have indented linear portions  28 , to which haptics  24 ,  26  are hingedly connected. 
     FIG. 4 shows a lens with indentations  28  at which are hingedly mounted haptics of generally rectilinear rod-like configuration, the haptics having plate elements  32  hingedly mounted to the optic. 
     FIG. 4 also illustrates a loop haptic portion  34  extending transversely from an outer edge portion of a haptic  36  to aid in centering the lens within the capsular bag of the natural human lens. A haptic  30  without a loop haptic portion  34  in mounted on the other side of the lens. 
     FIG. 5 shows an embodiment wherein haptics are hingedly mounted relative to an optic, and disposed about an optic  36  is a thin, annular transparent or translucent light-transmitting member  40  which reduces edge glare imposed on the retina. 
     It will be understood that various changes and modifications may be made from the preferred embodiment discussed above without departing from the scope of the present invention, which is established by the following claims and equivalents thereof.

Technology Classification (CPC): 0