Posters

Effect of corneal collagen cross-linking over the current Ferrara nomogram

Poster Details

First Author: A.Hashem EGYPT

Co Author(s):    Z. Ismail   F. Zaher   A. Assaf   F. Fawzy           

Abstract Details

Purpose:

To assess the impact of corneal collagen crosslinking (CXL) over the current Ferrara nomogram of intrastromal corneal ring segments (ICRS) insertion assisted by femtosecond laser for keratoconus correction for keratoconus (KC) correction.

Setting:

Kafrelsheikh university hospital

Methods:

In this prospective, comparative, and interventional study, 25 eyes of 23 patients with KC diagnosed clinically and topographically. The patients were assigned into two groups: Group A: 14 Patients underwent femtosecond assisted ICRS implantation according to Ferrara ring nomogram. Group B: 11 Patients underwent the same procedure in group A, followed in the same day by CXL. All patients were examined for a complete ophthalmological test: uncorrected visual acuity (UCVA), best corrected visual acuity (BCVA), spherical equivalent, keratometry (K1-flat, K2-steep, Kmax), corneal asphericity (Q value), pachymetry, and Scheimpflug imaging with the Pentacam preoperatively and 6 months postoperatively.

Results:

In-group A the mean Q value preoperatively was -1.24±0.51. The mean Q value postoperatively was -0.34±0.61. There was a decrease in mean Q absolute value, which was statistically significant (P<0.01). In-group B the mean Q value preoperatively was -1.45±0.72. The mean Q value postoperatively was -0.60±0.51. There was a decrease in mean Q absolute value, which was statistically significant (P<0.01). There was no statistically significant difference in preoperative, postoperative or change in Q value (P=0.27, P=0.15, P=0.77) between both groups.

Conclusions:

ICRS implantation in KC by means of femtosecond technology either with or without CXL allows a significant reduction of myopic spherical error because of the central corneal flattening, implantation allows statistically significant reduction of the corneal absolute Q value with no statistical difference between both groups, it was found that both ways of treatment are as effective as safe procedure for management.

Financial Disclosure:

None