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Prospective Randomized Comparison of Rotational Stability in Intraocular Lenses with C-loop-haptics versus Z-Haptics in Cataract Surgery
1Warlo I., 2Krummenauer F., 3Dick H. B.,
1 (Mainz)
2Johannes-Gutenberg-Universität Mainz, Koordinierungszentrum für Klinische Studien (KKS) (Mainz)
3Johannes-Gutenberg-Universität Mainz, Universitäts-Augenklinik (Mainz)
Purpose: The aim of the study was to compare the rotational stability of intraocular lenses (IOL) with C-loop-haptics and those with Z-haptics.
Methods: 50 patients with cataract were prospectively randomised to same parts to the design equivalent IOLs MS 612 S (C-loop-haptic) and MS 6120 (Z-haptic, both HumanOptics, Erlangen). Complete ophthalmological examinations were performed including assessment of the IOL: rotation after one day, one month and three months postoperatively. The statistical data were evaluated with medians and quartiles; the significances of the groups were performed using the Wilcoxon-test. The Fisher exact test for the primary finding of the study was used (rotation of at least 10°).
Results: The group of the IOLs with the C-loop-haptics showed a median lens rotation of 0° at the first day and 2° clockwise after one month and three months. The mean rotation was 1.2° clockwise at the first day postoperatively, 2° after one month and 2.6° after three months. In the Z-haptic group, the IOL did not rotate in the median. Mean rotation was 1.3° anticlockwise after one day, 1.8° at one month postoperatively and 1.9° after three months. Moreover, the range of IOL rotation of the C-loop-haptics was broader (three months postoperatively: maximum in the C-loop-haptics: 21° and 15.5° in the Z-haptics). There was no statistically significant difference at any time (1st day: p=0.061; 1 month: p=0.059; 3 month p=0.074). Three months postoperatively, 32 % of the C-loop-haptic IOLs and 16 % of the Z-haptic IOLs rotated at least 10° without statistical significant differences (p=0.32). In 59 % of the IOLs with C-loop-haptics the direction of the rotation was clockwise and 40 % of the IOLs with Z-haptics without a statistically significant difference between both groups (p=0.33).
Conclusions: After three months postoperatively, both lenses demonstrated a great rotatational stability with a mean deviation from the implantation axis of very few degrees. IOLs with Z-haptics showed a tendency to greater rotational stability then C-loop-haptics without any statistically significant difference. There was no statistically significant difference in visual rehabilitation and postoperative complications.