Intraocular lenses are supposedly placed inside the eye in replacement of the lens that was removed. This is needed to make your eye gain vision after cataract surgery. There are several different kinds of IOL’s, each of which is chosen to suit each patient’s visual preference.
Monofocal IOL: Monofocal, or single vision lenses, are the standard lenses that take the place of your cataract and can help you see distant objects. However, these lenses will not correct astigmatism and will not correct near vision, so it is likely that you will need to wear glasses at least part-time for distance activities and full time for near work even after surgery.
Toric IOL: In addition to correcting near-sightedness or farsightedness, toric lenses have the ability to correct astigmatism. If you have significant astigmatism before surgery, then this lens option will provide you with a better opportunity to have clear distance vision without glasses. Toric lenses still correct primarily distance vision and will not correct near vision.
Multifocal IOL: Multifocal lenses are appropriate for some patients who have a strong desire to see distant and near objects without glasses and who are willing to potentially somewhat compromise the quality of their vision to obtain freedom from glasses. In appropriate candidates, multifocal lenses can improve distance, intermediate (computer distance), and near vision and can reduce your dependency on glasses at all of these distances; however, neither lens restores the natural vision at all distances you had as a youth, and you may experience some problems with these lenses. These include, but are not limited to: poor night vision, including glare and halos, less sharpness of vision than may be obtained with a monofocal IOL and glasses, and inadequate near and intermediate vision that still may require the use of glasses.
Accommodative IOL : Accommodating IOL (intraocular lens implant) is designed to mimic the movement of the natural crystalline lens of the eye. When we are younger, the natural lens is very flexible and easily moves back and forth within the eye as we change our visual focus from up close to distance objects. As we age however, most commonly in our early to mid 40s, the eye loses its flexibility and can no longer easily accommodate those changes in our focus. To imitate the action of the young natural lens, the accommodating IOLs are able to move and/or change shape inside the eye to allow focus at multiple distances. While current technology accommodating IOLs are able to provide some range of focus, they cannot replicate the amazing range of vision you had when you were 20 years old.