Analysis of intraocular pressure elevation during LASIK surgery: a comparative study of four femtosecond laser devices

Session Details

Session Title: Advanced Tools for Outcome Assessment

Session Date/Time: Tuesday 17/09/2019 | 08:30-10:30

Paper Time: 10:04

Venue: Free Paper Forum: Podium 4

First Author: : M.Garcia-Gonzalez SPAIN

Co Author(s): :    G. Laucirica   G. Bolivar   E. Arranz-Marquez   J. Gros-Otero   V. Blazquez   M. Teus              

Abstract Details

Purpose:

To measure intraocular pressure (IOP) elevations in porcine eyes during laser in situ keratomileusis (LASIK) performed using four femtosecond (FS) laser platforms.

Setting:

Clínica Novovisión and Clínica Rementería (Madrid, Spain).

Methods:

Ex-vivo experimental animal study. Four FS devices, the iFS (the newest-generation IntraLase device with a flat interface), the WaveLight FS200 (that uses a flat interface), and the Victus and LenSx (both dual-FS lasers with curved interfaces), were used to create lamellar corneal flaps in freshly enucleated porcine eyes. The IOPs were recorded during placement of the suction ring on the eye (suctioning phase) and during the intrastromal laser application for flap creation (cutting phase) using a manometric technique with direct cannulation to the anterior chamber.

Results:

Twenty-eight eyes were analyzed (n=7/group).The mean IOP increase during suctioning was significantly (P=0.0001) higher with iFS (78.14±23.6 mmHg) and FS200 (57.94±17.3 mmHg) than with Victus (20.28±6.7 mmHg).LenSx performed the suctioning and applanation phases simultaneously,making it impossible to obtain the results of the suctioning phase alone.The IOP elevation during the cutting phase was significantly (P=0.0001) lower with LenSx (20±5 mmHg) compared with iFS (108.1±17mmHg),FS200 (49.9±17mmHg) and Victus (96.4±16mmHg).The total surgical time was significantly (P=0.0001) lower with LenSx (17.2±0.7 seconds) compared with iFS (25.1±4.3 seconds),FS200 (29.6±4.4 seconds) and Victus (33.4±0.7 seconds)

Conclusions:

Our preliminary results suggested that iFS, FS200 and Victus FS systems induced higher IOP increases and required longer surgical times to cut a LASIK flap than LenSx.

Financial Disclosure:

None