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This determines how well the eye can see in low light and how well it can distinguish objects from similarly colored backgrounds.
On the other hand, while Crystalens can accommodate to allow clear vision at different distances, the lens itself has a single focusing zone.
Most people require reading glasses as they reach middle age for this reason.
The Crystalens belongs to a select category of high tech intraocular lenses commonly called 'multifocual intraocular lenses'.
There are advantages and disadvantages to both these types of premium intraocular lenses.