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Comparing dislocation force between a flanged haptics IOL and a harpoon haptics IOL.

Johannes Zeilinger1, Martin Kronschläger2,3, Andreas Schlatter1

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|December 31, 2024
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Summary

The flanged haptic technique offers stronger secondary intraocular lens (IOL) fixation than the harpoon haptic technique. Flanged haptics required significantly more force to dislocate in human corneoscleral tissue.

Keywords:
Secondary IOL fixation

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Area of Science:

  • Ophthalmology
  • Biomedical Engineering
  • Materials Science

Background:

  • Secondary intraocular lens (IOL) implantation is a common procedure for correcting aphakia.
  • Secure fixation of secondary IOLs is crucial for long-term stability and visual outcomes.
  • Existing fixation methods, such as flanged and harpoon haptics, require comparative analysis for mechanical strength.

Purpose of the Study:

  • To compare the mechanical stability of two secondary IOL fixation techniques: flanged haptics (FH) and harpoon haptics (HH).
  • To determine the least required dislocation force (LRDF) for each fixation technique in human corneoscleral tissue.

Main Methods:

  • An experimental laboratory investigation using human donor corneoscleral tissue (CST).
  • Two types of IOLs were used: 20 three-piece IOLs with FH and 20 single-piece IOLs with HH.
  • A tensiometer was employed to measure the LRDF for haptic dislocation.

Main Results:

  • The flanged haptic technique demonstrated significantly higher LRDF (0.93 ± 0.43 N) compared to the harpoon haptic technique (0.45 ± 0.18 N) (p < 0.001).
  • Breakage occurred in three harpoon haptics during externalization, while no breakage was observed during dislocation for either technique.
  • Flanged haptics exhibited greater resistance to axial traction than harpoon haptics.

Conclusions:

  • The flanged haptic technique provides superior mechanical strength for secondary IOL fixation compared to the harpoon haptic technique in this in vitro study.
  • Harpoon haptics showed a higher susceptibility to breakage during externalization and less resistance to dislocation.
  • These findings suggest that flanged haptics may offer more robust and reliable secondary IOL fixation.