Understanding the accommodating intraocular lens

Purpose: To review current accommodating intraocular lens (IOL) designs and introduce a new design consisting of a plus lens and a minus lens. Setting. Cornea Consultants of Boston, Boston, Massachusetts, USA. Methods: Computer simulation studies of a model eye calculated the pseudoaccommodation range with different powers of 1 IOL or of 2 IOLs acting as a doublet. Results: The doublet consisting of a convex (plus) lens and a concave (minus) lens gave a greater range of power change than a single convex lens or a doublet consisting of 2 convex lenses. The greater range of power results from the plus lens moving forward. Conclusion: The results show that an IOL design consisting of positive and negative lenses that move closer or farther from each other offers a greater range of pseudoaccommodation than other designs. (C) 2003 ASCRS and ESCRS.