- Comparison to capsulotomy rates of other IOLs [ Time Frame: up to 8 years ]
Comparison in the literature regarding to the Rate of posterior capsule opacification of other IOLs
- Correlations of capsulotomy rate to parameters [ Time Frame: up to 8 years ]
Correlations of capsulotomy rate to the patient parameters age and gender, and to the surgical parameters cutting length, core hardness, duration of whole operation, time of phacoemulsification, phacoenergy, phacomachine, combination with other operation, surgeon, power of IOL.
This study is a postmarket study without interventions. Within the Standard Care Cataract surgery the participants have been implanted with the intraocular lens L313 in the period between September 2009 and December 2013. As criterium for the PCO was considered the Nd:YAG capsulotomy.
In the first step of the study, data was collected from the patients´charts.
In the second phase, a questionaire was sent to the patients with no recent examination, asking them to answer whether or not they received a laser procedure due to PCO. In doubt they could answer: “I am not certain”. For this step we ensured the positive Votum of the Ethic Committee of the University of Greifswald, Germany.
On the third step of the study, the patients that were not certain of having such a laser procedure or did not answer per post, will be contacted on telephone. By uncertainty or no answer on the telephone the family eye doctor will be contacted to receive the necesary information. If the eyedoctor has lost contact to the patient, then this patient will be documented als lost-to-follow-up.
Excluded were the patients that live >50km from Neubrandenburg, as well as patients with intraoperative capsule tear.
For the statistical analysis was used the program STATISTICA (StatSoft, Hamburg, Deutschland) and the survival analysis using the Kaplan-Meier formula, the statistical significance using the Chi-squared test and Spearman-Rank corelation and the Bonferroni adjustment if the test was repeated.
We compared our results with the results of other publication. In order to do that we calculated the capsulotomy qoute from our study according to the time of the PCO recorded on the other studies. Included were only comparing studies that also used YAG-capsulotomy as criterium for the PCO.
Furthermore secondary data was collected: age, gender, cutting length, core hardness, duration of whole operation, time of phacoemulsification, phacoenergy, phacomachine, combination with other operation, surgeon, power of IOL. This data will be taken in concern for the validity of this study.