<qa>  What is the name of the artificial lens implanted in the eye?During cataract surgery an artificial lens is implanted in the eye. These artificial lenses are called intraocular lenses IOLs and there are many different types of IOL designs. IOLs are of fixed focus and so unless a multifocal IOL is used you would need to wear spectacles for viewing near objects. This study has been designed to look at how well a multifocal IOL corrects distance and near vision in comparison with a conventional monofocal IOL. Both types of IOLs are commercially available and are commonly implanted. Using new non-invasive methods we hope to be able to better judge the visual performance of these IOLs. In addition the study will involve imaging and examining the IOLs to determine the prevalence of any post-operative complications. 