Accomodating intraocular lenses Chat meet and fuck sites
According to a preferred aspect of the invention, the ciliary body is maintained in the relaxed state for the duration of the time required for the capsule to naturally heal and shrink about the lens; i.e., possibly for several weeks.
After healing has occurred, the restraining element automatically or under surgeon control releases the lens from the stressed state.
An intraocular lens (IOL) system includes an optic, a pair of haptics located on sides of the optic, and hinge portions at each of the optic haptic junctions. As such, the process of accommodation is made more efficient by the interplay between stresses in the ciliary body and the lens. In addition, the Smith arrangement relies upon pressure from the anterior and posterior walls of the capsular bag to deform the lens, which requires that the lens be extremely resilient and deformable. Fourth, the proposed method invites cautionary speculation as to the result should the glue fail to hold the lens in position in entirety or over a sectional region.
The hinge portions have stressed and non-stressed configurations. When the ciliary body relaxes and reduces its internal stress, there is a compensatory transfer of this stress into the body of the lens, which is then stretched away from its globular relaxed state into a more stressed elongated conformation for distance viewing. However, the more resilient and soft the lens elements, the more difficult assembly within the capsular bag becomes. Fifth, it is well known that after lens implantation surgery the capsular bag, upon healing, shrinks.
Through a process termed accommodation, the human eye can increase its focusing power and bring into focus objects at near. In any arrangement that is connected to the ciliary body, by haptic connection or otherwise, extensive erosion, scarring, and distortion of the ciliary body usually results. The lens comprises front and rear flexible walls joined at their edges, which bear against the anterior and posterior inner surfaces of the capsular bag. 6,231,603 to Lang each disclose an intraocular lens design where the configuration of a hinged lens support ostensibly allows the intraocular lens to change axial position in response to accommodation and thus change effective optical power. This approach has numerous drawbacks, a few of which follow.
As a consequence, the lens 24 is also flattened, thereby undergoing a decrease in focusing power. Thus, the emmetropic human eye is naturally focused on distant objects. 4,892,543 to Turley, and rely upon the ciliary muscle to achieve the desired alteration in lens focus. 4,842,601 to Smith, there is shown an accommodating intraocular lens that is implanted into and floats within the capsular bag. All lenses that depend upon a shift in the axial position of the lens to achieve some degree of accommodation are limited by the amount of excursion possible during accommodation. A ledge adjacent to the anterior flexible lens is then bonded 360° around (at the opening of the capsulorrhexis) by the surgeon to the anterior capsule to secure the lens in place.
More particularly, according to a preferred method of implantation, the ciliary body muscle is pharmacologically induced into a relaxed stated (cycloplegia), a capsulorrhexis is performed on the lens capsule, and the natural lens is removed from the capsule.
The prosthetic lens is then placed within the lens capsule. 5, 2002, now abandoned which are both incorporated by reference herein in their entireties. Field of the Invention This invention relates broadly to ophthalmic implants.This occurs because the active muscular process of accommodation involving the ciliary body is not translated into a change in focusing power of the implanted artificial intraocular lens. However, the implant requires the patient to wear spectacles for proper functioning. If the gel is otherwise removed thereafter, Thompson ostensibly requires an additional surgical procedure therefor. More particularly, when the ciliary body 16 contracts, the diameter of the opening is decreased thereby causing a compensatory relaxation of the zonules 26. Thus, for a successful long-term implant, connection and fixation to the ciliary body is to be avoided if at all possible. The implantation procedure requires that the capsular bag be intact and undamaged and that the lens itself be dimensioned to remain in place within the bag without attachment thereto. For example, creation of the desired round capsulorrhexis within the stated tolerance required is particularly difficult. Accommodation is enabled by a change in shape of the lens 24. Such scarring and distortion leads to a disruption of the local architecture of the ciliary body and thus causes failure of the small forces to be transmitted to the intraocular lens. Thus, when the zonules exert a tensional pull on the circumference of the capsular bag, the bag, and hence the intraocular lens, is flattened, thereby changing the effective power of refraction of the lens. First, several aspects of the procedure are substantially difficult and not within the technical skill level of many eye surgeons.It is an additional object of the invention to provide an intraocular lens that permits uncomplicated implantation of the lens in a manner compatible with modern-day cataract surgery techniques.Tags: Adult Dating, affair dating, sex dating