Abstract This experimental study aimed to guide cataract surgeons in selecting suitable intraocular lens (IOL) injectors by evaluating the in vitro resistance force during IOL ejection and assessing associated injector damage across modern injector models. Twenty-five injectors from five manufacturers were tested using + 20 diopter lenses. IOLs were ejected into petri dishes, and resistance forces were continuously recorded with an automated digital force gauge. Parameters including maximum force and the area under the curve (AUC) were analyzed. After each ejection, injector nozzle tips were examined microscopically and graded for damage using the HeiScore. Significant differences in resistance forces were found among injector models ( p < 0.05), with maximum forces ranging from 4.39 ± 0.45 N to 25.71 ± 6.62 N. The AUC also showed significant variability, indicating differing levels of force required for IOL delivery. No ejection complications occurred, though one injector model exhibited markedly higher nozzle damage compared to others. These findings demonstrate substantial variability in resistance and durability among modern IOL injectors and underscore the importance of understanding these differences to ensure safe, controlled, and efficient IOL implantation in cataract surgery.
Friedrich et al. (Wed,) studied this question.
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