A prospective comparison between standard deep anterior lamellar keratoplasty (S-DALK) performed manually using a blade (trephine) and femtosecond laser-enabled deep anterior lamellar keratoplasty (IE DALK), where incisions are performed using the femtosecond laser.
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Change from preoperative topographical corneal astigmatism
Timeframe: preoperatively, 6, 12 and 15 months postoperatively