Influence of microkeratome parameters on the stromal bed and fap edge quality in laser in situ keratomileusis

Abstract

Purpose: Femtosecond lasers have become the standard for laser-assisted in situ keratomileusis (LASIK) fap creation, but advanced mechanical microkeratomes are still an alternative, more cost-effective way to create the fap. The SCHWIND Carriazo-Pendular microkeratome is one of the most commonly used microkeratomes. The infuence of different cutting parameters (head-advance speeds, cutting heads) on morphology of LASIK cuts was investigated. Setting: Experimental study performed at the University Eye Hospital of the Martin Luther University Halle/Wittenberg, Halle (Saale), Germany. Methods: The Carriazo-Pendular microkeratome was used on freshly enucleated porcine eyes for lamellar keratotomy. After fap removal, the cutting edge and stromal bed were evaluated from scanning electron micrographs using an individualized scoring system. Four different settings of microkeratome parameters were compared. For each setting, eight cuts were evaluated (n=32). Results: Different oscillation frequencies and head-advance speeds did not infuence the cutting qualities. A higher oscillation/feed rate ratio seemed to be advantageous for a smoother interface. Concerning different cuttings heads, a deeper keratotomy led to sharper cutting edges. The thinner the fap, the more irregularities in the stromal bed appeared. Complications did not occur. Conclusion: The Carriazo-Pendular microkeratome is a safe tool with which to create a LASIK fap and is a good alternative to a costly femtosecond laser. Deeper keratotomies, as well as the use of a higher oscillation/feed rate quotient, improve the cutting quality. © 2014 Heichel et al.