[Neuhann capsulorhexis: a technic for reliable implantation of the capsule sack]

The Neuhann Capsulorhexis allows for a continuous, circular opening in the anterior lens capsule. After excavation of the lens matter the circular round edge in the anterior capsule provides maximum stability in the zonulolenticular diaphragm and facilitates controlled in-the-bag implantation of the lens haptic. Histologic studies of cadaver eyes have revealed that the correlation between the position of the lens loops as intended by the surgeon intraoperatively and their actual positioning is poor. It has therefore not been possible to prove the advantages of all-in-the-bag implantation as compared to sulcus fixation. The Neuhann Capsulorhexis reduces the morphological variability of the anterior capsule; furthermore, the position of the lens haptic can easily be determined both intraoperatively as well as postoperatively. This is a prerequisite for evaluating the best position for the lens haptic as well as for clinical evaluation of new types of intraocular lens.