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A Quasi-IOL is defined as a secondary intraocular lens implant: also known as a piggyback lens: designed to be placed in the eye in addition to a primary lens. It is used to correct:
Removing a primary IOL that has already scarred in or fused to the lens capsule can be risky and can lead to retinal complications. A quasi-IOL is much thinner and is designed to sit in the sulcus (the space in front of the lens bag): making it a safer: less invasive way to fine-tune the patient's vision.
The surgery is performed as a secondary procedure: often months or years after the original cataract surgery. The surgeon makes a tiny incision and slides the quasi-IOL over the top of the existing lens. Because it is so thin: it does not touch the original lens: preventing interlenticular opacification or cloudiness between the two optics.
Yes: this is a popular use for quasi-IOLs. If a patient had a standard monofocal lens for distance: they can have a multifocal quasi-IOL added later. This gives them the ability to see both distance and near without the risks associated with a full lens exchange: effectively upgrading their vision to a premium level.
Potential complications include:
Most quasi-IOLs are made of highly biocompatible: foldable silicone or acrylic. They are specifically engineered with soft edges and vaulted haptics (arms) to ensure they do not rub against the sensitive tissues of the iris or the drainage angle of the eye.
No: just like the original cataract lens: you cannot feel a quasi-IOL inside your eye. It is completely microscopic and invisible to the naked eye. It does not move or shift: and once it has healed: it remains a permanent part of your eye's optical system.