I am about to perform laser surgery on a patient of mine who had uncomplicated refractive lens exchange surgery with trifocal lens implants. The patient feels that her vision is blurred for distance and is much clearer when the small residual prescription in each eye (-0.5 dioptre) is corrected. To give her the best possible result and clearest vision from her expensive new lenses she needs correction of this small prescription which would probably go unnoticed in an eye without a multifocal lens.
During cataract or lens replacement surgery the lens implant power is based on a predictive formula. This is accurate in most cases, but in roughly 1 in 100 patients the predicted prescription may be different to the end result. The commonest cause of unsatisfactory or blurred vision in patients with multifocal or trifocal lenses is due to residual uncorrected prescription. This is even more so if there is a high level of residual astigmatism.
If your surgeon is unable to correct this by laser eye surgery you may be referred to another surgeon to have your prescription corrected. Worse still, nothing further may be done and the patient may simply be asked to accept their visual outcome. There may be further costs if another surgeon is required and patients should clarify from the outset what actions will be taken in the event of blurred vision after multifocal or trifocal lens implants. Residual prescriptions only require correction if it leads to unsatisfactory results. There may be other causes of reduced vision such as cystoid macular edema or early posterior capsular opacification which your surgeon should exclude.