Femtosecond laser-assisted circular keratotomy (CKT) to halt progression of keratoconus stage I and II: evaluation of 2 years follow-up

Session Details

Session Title: Cornea Surgical II

Session Date/Time: Tuesday 13/09/2016 | 08:00-10:30

Paper Time: 08:46

Venue: Hall C2

First Author: : N.Hirnschall AUSTRIA

Co Author(s): :    J. Krumeich   D. Breyer                 

Abstract Details

Purpose:

To evaluate outcomes and practicability of Femtosecond Laser cut CKT in comparison to the same method in which a trephine was used to create a circular scar, 185eyes of the trephine group are retrospectively analysed and compared with 57 eyes of the Femto group. Statistical evaluation is provided comparing both procedures.

Setting:

Clinic Krumeich, Bochum, Germany

Methods:

7mm in diameter circular incision around the optical axis is created. In the trephine group the Guided Trephine System(GTS) was used to create the cut of 80% of the thinnest Orbscan value and sewn with a 10x0 nylon double running antitorque suture in peribulbar anesthesia. In the Femto-group the Ziemer Z6, Switzerland was used. The cut generated extended from 100µm below the epithelium to 60µm above Descemet’s membrane. The operation was done in topical anesthesia both under direct microscopic visual control and screen-based electronic guidance.Keratometry, manifest refraction, BCVA and the difference of vector cylinders were statistically analysed.

Results:

In the trephine group keratometry showed no progression at 5 years in 84.3% (n=51) Astigmatism was stable in 92.2%.. BCVA improved significantly from preoperative to 5 years in 73.68% (n=38). BCVA did not change in 18.42% (n=36). The Femto group comprised the period of 3 months to 2 years and showed quasi identical statistical figures.

Conclusions:

CKT of both trephine and Femto group halt progression of early stage keratoconus. Advantages of the Femto use are speed of the operation and of postoperative course, sutureless, closed-eye and pain-free surgery.

Financial Disclosure:

NONE