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The authors designed a benchtop model to measure the tensile strengths and resistance to breakage of the haptics and haptic-optic junctions of the CT Lucia 602 (Carl Zeiss, California) and AcrySof MA60 (Alcon Laboratories, Texas) IOLs. For the haptic breakage experiment, a hemostatic forceps grasped the proximal one-third of the haptic while a second forceps, attached to an electronic force gauge, grasped the distal third of the same haptic. Linear force was applied using a track system until the haptic broke. For the haptic-optic avulsion experiment, a forceps stabilised the IOL in the centre of the optic while the forceps on the distal third of the haptic pulled until haptic avulsion occurred. The experiments were repeated eight times. On average, the force needed to break the haptic of the CT Lucia was 2.92 newtons(N) (standard deviation (SD): 0.53N) but only 1.04N for the MA60 lens (SD: 0.26N) (P<0.0001). Avulsion of the haptic required 1.10N (SD: 0.26N) for the CT Lucia and 1.35N (SD: 0.18N) for the MA60 lens (P<0.0475). This study shows the CT Lucia have greater tensile strength than the MA60 lens in-vitro. This is relevant in the Yamane techniques and cases with a higher risk of late IOL dislocation.

Haptic and haptic-optic junction structural integrity of CT Lucia and MA60 intraocular lenses
Yannuzzi NA, Watane A, Patel NA, et al.

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Mahmoud Ahmed

Royal Liverpool University Hospital, UK.

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