Long-term capsule clarity with a disk-shaped intraocular lens

Area of Science:

• Ophthalmology
• Biomaterials Science
• Medical Device Engineering

Background:

• Posterior capsule opacification (PCO) is a common complication after cataract surgery.
• Intraocular lens (IOL) design plays a crucial role in mitigating PCO.
• Maintaining capsular bag clarity is essential for long-term visual outcomes.

Purpose of the Study:

• To evaluate the long-term capsular clarity of a modified disk-shaped, 1-piece hydrophilic acrylic monofocal intraocular lens (IOL) named Zephyr.
• To assess the impact of the IOL's unique design, featuring a suspended disk and complete haptic rings, on capsular bag interaction.

Main Methods:

• An experimental study was conducted using New Zealand rabbits.
• Study (Zephyr hydrophilic acrylic) and control (hydrophobic acrylic) IOLs were implanted in contralateral eyes.
• Eyes were examined clinically for six months, followed by Miyake-Apple posterior capsular clarity scoring and histopathological evaluation.

Main Results:

• The Zephyr IOL group showed significantly lower posterior capsule opacification scores (0.28 ± 0.26) compared to the control group (4 ± 0) at six months (P < .0001).
• The anterior capsule remained clear in the study group, whereas the control group experienced synechiae formation, hindering analysis.
• Histopathological evaluation corroborated the superior capsular clarity observed in the study group.

Conclusions:

• The modified disk-shaped hydrophilic acrylic IOL demonstrated exceptional capsular bag clarity in a rabbit model over six months.
• The IOL's design, which keeps the capsular bag open and expanded while minimizing IOL-anterior capsule contact, is likely responsible for the reduced opacification.
• This innovative IOL design holds promise for improving long-term visual outcomes by minimizing posterior capsule opacification.