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The standard new lens implant that is used to replace a cloudy lens is known as a monofocal lens. It provides excellent image quality but has a limited focussing range. This means that you will still need glasses for either close work or distance vision.
Multifocal Lenses and Trifocal Lenses
There are a wide variety of multifocal and trifocal lenses available. They provide good near, intermediate and distance vision, and significantly reduce the need for spectacles. However, a few patients may experience a side effect known as ‘light scatter’. The main effects of this include seeing haloes around lights or a slight difficulty seeing in artificial lighting. These tend to occur in the period just after surgery but most patients will experience improvement over time.
Accommodation occurs when your natural lens changes shape automatically to view an object. As there aren’t any known materials that can replicate this action Accommodating lenses have been developed to try and mimic the response. However, it’s worth noting that they don’t offer any significant advantages over monofocal lenses.
While a pre-existing astigmatism can be treated during surgery simply by making tiny cuts on the eye’s surface it only corrects mild instances of the condition. To treat higher degrees of astigmatism a specially made Toric lens can be inserted.
Toric Multifocal Lenses
Following cataract surgery or refractive lens exchange Toric Multifocal Lenses can be used to reduce the need for glasses in patients that suffer significant astigmatism.