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From the literature it is apparent that, although a multitude of non-surgical ap-proaches have been tested in the last few years, only surgical options are left for preventing PCO. Within this frame, we tested three different surgical approaches, which have been the subject of nine studies in this thesis.
1. First study: IOLs with circular haptics
In the fi rst study we evaluated the advantages of IOLs with circular haptics. IOLs usually have J- or C-loop haptics, which are known to cause folds in the posterior capsule, especially those IOLs with a large total diameter implanted in eyes with a small capsular bag. This problem was found to be less pronounced in IOLs with circular haptics as they are more likely to equally stretch the posterior capsule, allow-ing less LECs to grow because of a better contact between the IOL and the posterior capsule.
In the set-up of this study, we compared IOLs with two different designs of circular haptics: one with a closed loop haptics (n = 335) and one with open loops (n = 103).
We looked at the IOL centration, the presence of folds in the posterior capsule and the PCO rate.
2. Second study: posterior continuous circular capsulorhexis
In the second study an innovative surgical technique is evaluated. Based on the hypothesis that as long as the posterior capsule remains in place there will always be some LECs escaping from the equatorial region and migrating to the posterior capsule that will cause PCO. It was therefore assumed that removing the central part of the posterior capsule would be a drastic way of preventing PCO. To do this, the central part of the posterior capsule is taken out during cataract surgery by a continuous circular capsulorhexis. In analogy with the well-known similar procedure for the anterior capsule (ACCC), this operation is referred to as posterior continuous circular capsulorhexis or PCCC. The fi rst patients treated this way in our center and
In the second study an innovative surgical technique is evaluated. Based on the hypothesis that as long as the posterior capsule remains in place there will always be some LECs escaping from the equatorial region and migrating to the posterior capsule that will cause PCO. It was therefore assumed that removing the central part of the posterior capsule would be a drastic way of preventing PCO. To do this, the central part of the posterior capsule is taken out during cataract surgery by a continuous circular capsulorhexis. In analogy with the well-known similar procedure for the anterior capsule (ACCC), this operation is referred to as posterior continuous circular capsulorhexis or PCCC. The fi rst patients treated this way in our center and