The femtosecond laser intrastromal astigmatic incision vs the femtosecond laser transepithelial astigmatic incision: which is better?

Session Details

Session Title: LASIK

Session Date/Time: Monday 12/09/2016 | 08:00-10:30

Paper Time: 09:42

Venue: Hall C3

First Author: : H.Tchah SOUTH KOREA

Co Author(s): :    J. Kwag   H. Jeong   C. Moon   J. Yoon   J. Kim   M. Kim     

Abstract Details

Purpose:

To evaluate the result of two different surgical methods of the femtosecond laser-assisted astigmatic keratotomy, intrastromal astigmatic incision versus transepithelial astigmatic incision.

Setting:

Department of Ophthalmology, University of Ulsan College of Medicine, Asan Medical Center

Methods:

In group 1, 45 eyes ( average astigmatism 1.28±0.61 D) had intrastromal arcuate incisions concurrently done with femtosecond laser cataract surgery (with Catalys®). Paired incisions were made intrastromally at the middle 60% of corneal thickness at 8mm diameter. In group 2, 36 eyes (average astigmatism 1.40±0.51 D) underwent epithelial-penetrating astigmatic keratotomy (with IntraLase®). Paired symmetrical arcuate keratotomies were made 80% depth at 9 mm diameter according to modified LRI nomogram. At postoperative 1, 6 months, corrected and uncorrected distance visual acuity, manifest refraction, automatic keratometer, and topography and measured change of astigmatism was analyzed in vector analysis method.

Results:

Corneal astigmatisms were significantly decreased compared with preoperative data in both groups in all postoperative period. The mean absolute astigmatism decreased significantly from 1.22±0.44 D to 0.71±0.42 D (P < 0.05) in group 1 and 1.40±0.51 D to 0.85±0.40 D (P < 0.05) in group 2. Error ratio and correction ratio by vector analysis were 0.57±0.32 and 0.89±0.40 in group 1, 0.56±0.32, and 0.88±0.47 in group 2 respectively (P=0.25, 0.19).

Conclusions:

The astigmatic correction effect of intrastromal astigmatic incision concurrently done with cataract surgery was comparable with transepithelial astigmatic incision after cataract. surgery. And both femtosecond laser-assisted procedures were very safe. More adjustments of nomograms are needed to improve the predictability of the surgical results.

Financial Disclosure:

NONE