Standard IOL’s – The basic Government Issue IOL. You will often need to wear glasses with this type of IOL. Aspheric IOL’s – This type of IOL has aspheric optics, which improves vision quality. Astigmatism correcting IOL’s – These IOL’s correct astigmatism, where the eye is steeper in 1 direction than the other (much like a football cut in half). An eye without astigmatism has the same curvature in all directions (like a basketball cut in half). Presbyopic correcting IOL’s – These IOL’s improve both distance and near vision without glasses and are most effective at decreasing or eliminating the use of glasses or contact lenses after surgery.