The natural lens in a young person is flexible and can change focus smoothly between distance and near. There is no lens implant available today which is able to mimic this – all have a fixed point of focus that does not change.
The best quality of vision following cataract surgery is achieved by selecting a single focus lens implant to give good distance vision without glasses for both eyes and wearing glasses to see clearly for near. Most people choose this arrangement.
There are various new and established approaches to producing good vision for both distance and near in order to reduce dependence upon glasses. These include new lens implant designs and ways of combining them. Although potentially liberating for many people, all involve some compromise of quality of vision and so, they are not suitable for everybody.
The arrangement involving least compromise is to use a single focus lens implant to set one eye for distance and the other for near. This is known as monovision and surveys of eye surgeons consistently show that most would choose it for themselves.