Accommodating intraocular lenses
The best visual acuity is achieved with the single focus accommodating lenses.The optic of these lenses moves forward and backward upon constriction and relaxation of the ciliary muscle. In some embodiments the peripheral portion is coupled to the posterior element. The actuator assumes a substantially conical configuration in a disaccommodated configuration.During cataract surgery, tthe natural lens of the eye (which is cloudy, causing poor vision) is replaced with an intraocular lens (IOL) implant.The standard and cheapest option is to implant a monofocal intraocular lens during the procedure, which gives great distance vision.Low-quality evidence also showed that more than 12 months after surgery, there was a compromise in distance vision for people with accommodative IOLs.This may be related to the finding that those who received accommodative IOLs also appeared to have a higher rate of posterior capsular opacification (thickening and clouding of the participants who received accommodative IOLs had a small gain in near visual acuity after six months.
The anterior element can be bonded to the intermediate layer, such as along the periphery of the anterior layer.
For best optical performance, the lens must be transparent. It is more common with increasing age, and is a common cause of visual impairment. Once all lens material is removed, an artificial lens, known as an intraocular lens (IOL) is implanted into the eye to lie in the original position of the removed natural lens.
All functions of the natural lens are preserved by an IOL, with the exception of accommodation.
Standard IOLs, known as monofocal IOLs, allow only distant objects to be focused and seen clearly. This problem after showed that participants who received accommodative IOLs had improvements in near vision at six months and at 12 months after surgery compared to those who received monofocal IOLs.
However, such improvements were small and reduced with time.