Given the choice, most people would prefer not to have to wear glasses for distance tasks such as driving. In good hands, cataract surgery is an opportunity not only to improve your vision but also to reduce spectacle dependence.
The most important factor in achieving this level of accuracy is the skill and experience of your Surgeon – precision, consistency, exacting and with rigorous attention to detail at every step as well as knowing how to adapt surgery to the requirements of each patient and the peculiarities of each eye. This level of understanding and refinement and the ability to apply it effectively and consistently comes only after years of experience as a Consultant Surgeon.
Accurate measurements of the dimensions and curvature of the eye are essential to correctly calculate the focus power of the lens implant that is best suited to you. Inaccuracy of a fraction of a millimetre will influence the choice of lens implant and the need for glasses afterwards.
Almost every eye has some degree of astigmatism (uneven focus) that can be corrected at the time of cataract surgery in order to make distance vision as clear as possible when not wearing glasses. A standard monofocal lens implant does not correct astigmatism which, if more than a small degree, can leave vision a bit blurred and needing glasses to see well for distance. Small degrees of astigmatism can be reduced by an individualised pattern of surgical incisions; any more is better corrected by a special toric lens implant.