Cataract surgery is two dimensional and VR surgery is three dimensional. What does this mean? In cataract surgery as well as in VR surgery surgical performance is one key factor. But in VR surgery the assessment of a retinal case is a second key factor. A wrong assessment in VR surgery can easily result in a failed surgery. You must think twice before surgery. I have seen so many complications because VR surgeons pushed the vitreous cutter into the eye without reflecting the underlying pathology and then realizing that they cannot cope.