How successful is Lens Exchange surgery?
The aim of Lens Exchange surgery is to alter the focus of the eye. Special measurements of the eye are taken before the operation. Formulae are then used to calculate what power of intra-ocular lens implant to use in order to achieve the desired focus for the eye. In the large majority of patients the achieved new focus for the eye is close to that intended. The current consensus amongst eye specialists in the UK is that at least 85% of eyes should be within 1 dioptre of the intended focus. This does mean that for a minority of patients the focus of the eye after surgery is not quite as intended (though still usually much improved). For these patients spectacles, contact lenses or some additional surgical procedure such as laser surgery may be required to get the focus “spot on”. One reason for missing the intended focus in some cases is that although the formulae used to calculate the intra-ocular lens power are well tried they are not perfect. This is because of biological variabilit
