4, 2002, now abandoned, which is a continuation-in-part application of U. Attempts have been made to provide IOLs with accommodating movement along the optical axis of the eye as an alternative to shape changing. The negative or minus optical power of the first optic body compensates for the excess plus or positive optical power in the first optic body.
In one such lens, the lens structure comprises an anterior element coupled to the anterior optic and a posterior element coupled to the posterior optic. For example, the maximum theoretical amount of axial movement for a simple disc lens having an overall diameter of 11 millimeters (mm) and an optic diameter of 5 mm that undergoes 1 mm of compression in its diameter is about 1.65 mm.
The anterior and posterior elements are coupled to one another at a peripheral region of the intraocular lens. The amount of axial movement required for a plus 15 diopter optic to provide 2.5 diopters of additional power in the spectacle plane is about 2.6 mm.
Such a conventional IOL has very limited, if any, accommodating ability. In those cases where the first optic body has a negative optical power, it is also called the compensating optic body.
After the natural crystalline lens is removed, for example, because of cataract or other condition, a conventional, monofocal IOL can be placed in the posterior chamber. The first optic body has a negative or plano optical power and is adapted to be placed in a substantially fixed position in a mammalian eye.
Intraocular lenses for providing accommodation include an anterior optic, a posterior optic, and a lens structure. Consequently, the required amount of movement of the second optic body in the eye can be approximately the same for all patients.
In one such lens, the lens structure comprises an anterior element coupled to the anterior optic and a posterior element coupled to the posterior optic. Intraocular lenses for providing accommodation include an anterior optic, a posterior optic, and a lens structure. The present ILCs provide accommodation, preferably an acceptable degree of accommodation, in spite of movement and space limitations in the eye.
This ciliary muscle action shapes the natural crystalline lens to the appropriate optical configuration for focusing light rays entering the eye on the retina. In one broad aspect of the present invention, intraocular lens combinations (ILCs) comprise a first optic body, second optic body and a movement assembly.
In other words, the optical power of the second optic body, that is the primary or movable optic body, can be approximately equal from optic body to optic body, while the optical power of the first optic body, that is the compensating or fixed optic body, is adjusted from optic body to optic body to meet the specific vision correction needs (prescription) of each individual patient.
The use of such a compensating lens, that is the first optic body having a negative optical power, can allow for standardization of the optical power correction in the second optic body.