You may need at least a few days to get used to your new multifocal vision after cataract surgery. This is primarily because the lens of the eye affects how light lands on the retina. The retina then passes signals through the optic nerve to the brain to interpret them as visual objects. After this passage of light through the eye changes with the new IOL, the brain needs to adapt. This is referred to as neural adaptation. In most cases, we see a nice transition into visual clarity within a week or two. That said, it can take up to several months for this to happen.