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International Journal of Keratoconus and Ectatic Corneal Diseases


Aim: To simplify and enhance safety in the generation of a stabilizing intracorneal scar by circular keratotomy (CKT). A femtosecond laser was used to perform individually sized intraparenchymal cuts.

Materials and methods: As equipped, the Ziemer Z6 femtosecond laser cuts a 400-ìm-deep incision with a diameter of 7.0 mm around the optical axis. The epithelium, Bowmann’s membrane, the internal borders of Descemet’s membrane, and the endothelium are not affected.
The 3-, 6-, and 12-month postoperative values were compared with the 1-month postoperative keratometric readings and astigmatism. The preoperative best corrected visual acuity (BCVA) with glasses was compared with the values found at the same time points as noted above.

Results: Statistical evaluation indicated that keratometry within ±1.5D remained in 96.6, 93.1, and 96.6% of cases at the 3-, 6-, and 12-month time points respectively.
Astigmatism was stable at the same time points in 100, 95.8, and 92.3%.
The BCVA improved in 12 cases throughout the first postoperative year (48%, n = 25); however, 11 cases did not change (44%) and 2 cases lost at least one line (8.0%).

Conclusion: Femto CKT halts the progression of keratoconus for at least 1 year in 96.6% of cases. This treatment provides keratometric and refractive stability for over 1 year. This result, in conjunction with the significant improvement in BCVA, demonstrates the potential of this method for patients with stage I and II keratoconus.

Keywords: Circular corneal cut, Circular keratotomy, Keratoconus.

How to cite this article: Krumeich JH, Hirnschall N, Breyer D, Laufer F. Femto Circular Keratotomy to Halt the Progression of Keratoconus I and II. Int J Kerat Ect Cor Dis 2016;5(3):109-113.

Source of support: Nil

Conflict of interest: None

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