Preoperative intraocular pressure is a stronger predictive factor than the vacuum level for intraocular pressure rise during suction in femtosecond laser-assisted cataract surgery

Session Details

Session Title: Presented Poster Session: FLACS & Surgical Devices

Venue: Poster Village: Pod 1

First Author: : S.Mariacher AUSTRIA

Co Author(s): :    J. Wendelstein   M. Mariacher   M. Bolz   P. Laubichler              

Abstract Details

Purpose:

To evaluate the effect of the initial preoperative intraocular pressure (IOP) and the vacuum level on the IOP during the application of the VICTUS suction ring for femtosecond laser-assisted cataract surgery.

Setting:

Department for Ophthalmology and Optometry, Kepler University Hospital, Johannes Kepler University Linz, Austria

Methods:

In 40 enucleated porcine eyes IOP was measured by intracameral manometry prior, during and after the application of the suction ring of the VICTUS femtosecond laser platform (Bausch & Lomb, Technolas Perfect Vision GmbH, Germany). Different preoperative IOP levels (12, 16, 20 and 24 mmHg) and different vacuum levels (350 to 550 mbar) were investigated.

Results:

Multivariate regression analysis indicated that both, the vacuum level (beta=0.138; p<0.001) and significantly more the preoperative IOP (beta=0.861; p<0.001) were predictive factors for the IOP increase during vacuum application (r-squared=0.761; F=7621.5; p<0.001). Mean IOP was 3.15±1.51mmHg higher during suction when increasing the vacuum level from minimum to maximum (350 to 550mbar), whereas an increase of the mean preoperative IOP by 4mmHg resulted in a 6.20±2.88mmHg higher IOP. Overall mean IOP elevation was about twice as high when raising the preoperative IOP by 4mmHg compared to mean IOP elevation when turning vacuum from minimum to maximum.

Conclusions:

Preoperative IOP turned out to be a stronger predictive factor for IOP rise during suction in femtosecond laser-assisted surgery than the applied vacuum level itself. Hence, eyes with a higher preoperative IOP tend to be at a higher risk for significant IOP increase during the application of the patient interface than those with lower preoperative IOP.

Financial Disclosure:

None