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Flap and interface complications in LASIK
1University of Heidelberg, Faculty of Clinical Medicine, Mannheim, Germany. knorz@eyes.de
Abstract:
Flap complications using first-generation microkeratomes, such as the Automated Corneal Shaper, were reported in 2.5% (27 of 1,062 eyes). With modern microkeratomes, such as the Hansatome, keratotomy-related complications dropped to 0.16% (46 of 28,201 eyes). Postoperative flap complications, such as flap slippage, occurred in 1.42% (21 of 1,418 eyes), most of them during the first hour after surgery. Interface complications are a new diagnostic entity as the interface between flap and stroma presents an empty space where fluid or cells can accumulate. Diffuse lamellar keratitis usually occurs within the first postoperative days but may also develop later on, triggered, eg, by recurrent corneal erosion. Epithelial ingrowth is a rare complication caused rather by postoperative invasion than by intraoperative implantation, which suggests that the quality of the flap edge and its apposition are very important. Interface fluid is a rare but important phenomenon related to steroid-induced glaucoma but presenting with falsely low tonometry readings.
Insights
Modern microkeratomes significantly reduce flap complications in eye surgery compared to older models. These advancements improve patient safety by minimizing risks like flap slippage and interface issues.
Area of Science:
- Ophthalmology
- Corneal Surgery
- Laser Vision Correction
Background:
- First-generation microkeratomes had a notable rate of flap complications (2.5%).
- Modern microkeratomes have substantially decreased intraoperative complication rates.
- Postoperative complications such as flap slippage and interface issues require careful monitoring.
Purpose of the Study:
- To analyze the incidence and types of flap and interface complications in corneal refractive surgery.
- To compare complication rates between first-generation and modern microkeratomes.
- To discuss the nature and management of interface complications like diffuse lamellar keratitis and epithelial ingrowth.
Main Methods:
- Retrospective analysis of complication data from studies utilizing Automated Corneal Shaper and Hansatome microkeratomes.
- Review of reported postoperative complications including flap slippage, diffuse lamellar keratitis, epithelial ingrowth, and interface fluid.
- Categorization of complications based on timing (intraoperative vs. postoperative) and etiology.
Main Results:
- Keratotomy-related complications decreased from 2.5% with older devices to 0.16% with modern microkeratomes.
- Postoperative flap slippage occurred in 1.42% of cases, predominantly within the first hour after surgery.
- Interface complications, including diffuse lamellar keratitis and epithelial ingrowth, represent new diagnostic considerations, with epithelial ingrowth linked to flap edge quality.
Conclusions:
- Modern microkeratome technology has dramatically improved safety by reducing flap complication rates.
- Understanding and managing interface complications is crucial for optimal patient outcomes after corneal refractive surgery.
- Attention to flap edge quality and apposition is vital for preventing complications like epithelial ingrowth.