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S.N. Patel, R.N. Sjaarda, J.P. Mahadevia; Force Analysis of Single Piece Acrylic Lens Haptics to Determine Stability of Intraocular Lens Suture Fixation . Invest. Ophthalmol. Vis. Sci. 2003;44(13):268.
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Purpose: New injectable single piece acryliclenses are now commercially available for implantation into the capsular bag. This study was conducted to determine whether acrylic haptics can be suture fixated without concern of suture damage to the haptic, in cases of poor capsular support. Methods: Prolene sutures of varying sizes (6-0, 8-0, 10-0) were tied to the haptic of one piece acrylic lenses (SA60AT Alcon Lens) at three possible locations: the edge, the middle of the haptic, and at the junction of the haptic and optic. One end of the suture was connected to a Chatillon force gauge while the other end was pulled tautly until the suture or the haptic snapped off (breakpoint). The maximum force at the time the haptic or the suture broke (breakpoint) was measured, in Newtons. Results: Of the 36 testing conditions, in three cases the suture transected or "cheesewired" the haptic. In two cases, the haptic snapped with 6-0 sutures (one at the middle of the haptic and one at the edge). In one case, the haptic broke with an 8-0 suture. The 6-0 prolene sutures required the largest force to break (0.65- 2.47 Newtons or N). The 8-0 suture had force values (0.37-0.50 N) close to the 10-0 range (0.18-0.37 N). Conclusions: This preliminary data suggests that 10-0 prolene sutures can be used to safely fixate the haptic of a single piece acrylic lens, in cases of poor capsular support due to various etiologies. The 10-0 prolene suture would break at the grasping point prior to any cheesewiring effect on the haptic . The larger breaking-point strength of the 8-0 and 6-0 Prolene sutures would make such sutures unsuitable for iris-fixation of single piece acrylic lenses.
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