Accommodating intraocular lenses cost
Accommodating intraocular lenses cost - illinois online dating legislation
The diffractive portion of the optic consists of 12 concentric rings on the anterior surface of the optic, and it is located within the central circle, which is 3.6 mm in diameter and is designed to provide distance and near vision in moderate to bright light.
Ring location, spacing and variation of height serve within the pupillary aperture to provide a satisfactory near image at approximately 25 to 33 cm. The Re Stor IOL is a foldable IOL designed for placement within the capsular bag at the time of phacoemulsification.
It is injected using the Monarch B or C cartridge through the traditional phacoemulsification incision. The side effect profile of the Re Stor multifocal lens is very similar to that of traditional monofocal IOLs.
However, with the Re Stor, there is a greater chance of having significant halos (5 percent of all patients) or glare (5 percent) compared with a monofocal lens (1 percent) and 2 percent, respectively.
The halos or glare were severe enough that in studies conducted for Alcon by independent consultants 0.5 percent of patients requested that their Re Stor IOL be removed.
Cataract removal is the most common surgical procedure in the United States, with nearly 3 million operations performed annually.
This number will likely grow, according to National Eye Institute statistics that predict an increase in the number of people in the United States with cataracts from the current level of 20 million to more than 30 million by the year 2020.
This estimate is further supported by data from the Framingham Eye Study showing that the prevalence of cataracts increased with age from 4 percent in the 52 to 64 age group, to 50 percent in the 65 to 74 age group, to more than 90 percent in the 75 to 85 age group.
Cataract surgery with implantation of a traditional monofocal IOL, targeting distance vision, leaves most individuals dependent on some correction, usually spectacles, for near vision.
Traditional strategies for these patients have included the following: The newer IOLs that actively accommodate by changing optic position or shape through attempted preservation of ciliary body function have received mixed reviews with regard to the predictability of accommodative range and the longevity of effect; however, the principles involved offer the best opportunity for us to eventually establish a mechanism and outcome that most closely rivals the vision found in youthful emmetropes.
Recent advances in pseudoaccommodative multifocal IOL technology offer a new alternative for those desiring vision at both distance and near.
In March 2005 the Re Stor apodized diffractive IOL from Alcon and the Re Zoom multifocal refractive IOL from Advanced Medical Optics both received FDA approval for capsular bag implantation following cataract surgery. The Re Stor multifocal IOL uses three separate but complementary optical principles (refraction, diffraction and apodization) to achieve satisfactory near and far visual acuity.
The refractive portion of the optic functions like a standard IOL, with the optic periphery dedicated to distance vision and designed to optimize night vision when the pupil dilates under scotopic conditions.