Abstract: The dysphotopsia is the common complication after intraocular lens (IOL) implantation, which includes positive dysphotopsia and negative dysphotopsia. After IOL implantation the light from outside generates bright images on the retina. This is called positive dysphotopsia. The negative dysphotopsia is that the blind spot and shadow on the retina after IOL implantation because of the photorefraction through the square edge of the IOL. The posterior capsular opacification, the material and the edge design of the  IOL,  the diameter of IOL optical component, the position of incision and the irisoptic distance are the important influential factors that cause the dysphotopsia. Some patients after IOL implantation suffer from dysphotopsia. It effects their qualities of life. In this article, the reasons, influential factors,  treatment  and the newly developed examination methods of the dysphotopsia were reviewed.