Lower Intraocular Pressure in Cataract Surgery Enhances Outcomes

Overview

Lowering intraocular pressure (IOP) during cataract surgery using advanced fluidic systems improves chamber stability and patient comfort without compromising surgical efficiency. Emerging evidence suggests reduced corneal impact, less postoperative inflammation, and better anatomic preservation with physiologic IOP levels around 28 mmHg compared to traditional high IOPs.

Background

Traditional cataract surgery often involved elevated IOPs (65-85 mmHg) to maintain chamber stability, which could cause transient ocular hyperinflation and impact intraocular structures. Advances in phacoemulsification platforms now allow surgeons to maintain stable chambers at lower, more physiologic IOPs, reducing stress on ocular tissues. This shift aligns with a broader goal of minimizing surgical invasiveness and improving recovery. However, further research is needed to understand the long-term effects on glaucoma patients and combined procedures such as MIGS.

Data Highlights

Key Findings

• Advanced fluidic systems enable cataract surgery at physiologic IOPs (~28 mmHg) with maintained chamber stability.
• Lower infusion pressures reduce visible intraocular structural changes such as scleral stretching and pupil dilation.
• Reduced IOP during surgery is associated with less corneal endothelial stress and decreased early postoperative inflammation.
• Patient comfort during surgery improves with lower infusion pressures.
• Postoperative IOP measurements are similar regardless of intraoperative IOP settings, indicating effective viscoelastic removal.
• Transitioning to lower IOPs can be done incrementally without altering vacuum or aspiration flow rates.

Clinical Implications

Surgeons should consider gradually lowering infusion pressures during cataract surgery to approach physiologic IOP levels, enhancing patient comfort and reducing ocular tissue stress without sacrificing surgical efficiency. Individualization based on patient anatomy and surgeon preference remains important. Further studies are warranted to evaluate effects on glaucoma patients and combined MIGS procedures.

Conclusion

Lowering intraoperative IOP in cataract surgery using advanced fluidic technology represents a significant advancement toward less invasive, more physiologic procedures that promote faster recovery and improved patient experience. This evolving approach may redefine standards for safe and efficient cataract surgery.

References

1. Osher RH, 1993 -- Slow motion phacoemulsification approach
2. Rauen MP et al, 2024 -- Phacoemulsification using an active fluidics system at physiologic vs high intraocular pressure
3. Suzuki H et al, 2023 -- Effect of a new phacoemulsification and aspiration handpiece on anterior chamber stability
4. Scarfone HA, Rodriguez EC -- Evaluation of early changes of the anterior vitreous interf