From about 1950s, researches on intraocular lenses have begun. The primary target of these researches were cataract patients, whose natural eye lenses were removed due to becoming cloudy and causing cataract; they used intraocular lenses instead of wearing thick glasses after the surgery. These lenses were made of either PMMA or silicone plastic, compatible with the eye tissue.
Today, these lenses can be implanted in the eyes in order to correct severe nearsightedness, farsightedness and astigmatism, without removing patients’ natural eye lenses. The difference between this new method and implanting intraocular lenses during cataract surgery is that in this method, the natural lens of the eye remains intact and only one additional lens is inserted in front of it. However, during a normal cataract surgery, the natural lens of the eye is replaced by an artificial lens. For this reason, after an intraocular surgery, the patient will be capable of accommodation and corrected near vision in addition to distance vision; but in the other method, there would be no visual accommodation. Therefore, bifocal lenses should be prescribed.
Note: This method is not a proper alternative for LASIK or PRK in the eyes with low myopia, but it is suitable for high myopia and greater diopters.
In Tehran-Iran Noor Eye Hospital, lens implantation is performed by highly experienced experts.