Effect of hinged lamellar keratotomy on postkeratoplasty eyes

Abstract

Purpose: To evaluate the effect of a hinged lamellar keratotomy on refraction, vision, and corneal topography of postkeratoplasty eyes with high-degree astigmatism. Design: Noncomparative, interventional case series. Participants: A hinged lamellar keratotomy was performed on nine eyes of nine patients at least 9 months after penetrating keratoplasty and with high-degree astigmatism. All patients were spectacle and contact lens intolerant. Intervention: A superiorly hinged lamellar keratotomy (corneal flap), 160 μm in thickness and 9 mm in diameter, was created on all eyes included in this study. Each patient was examined 1 day, 1 month, and 3 months after surgery. Main Outcome Measures: Uncorrected visual acuity, best spectacle-corrected visual acuity, refraction, computerized analysis of corneal topography. Results: At each postoperative examination time, there was a significant reduction in both average spherical equivalent ( P < 0.05) and average absolute value of astigmatism ( P < 0.01) over mean preoperative values. The major changes were seen as early as 1 day after surgery, but both progression and regression of the effect were documented at later postoperative examinations. In all patients best spectacle-corrected acuity was maintained or improved after the procedure. Postoperatively, four patients could be successfully corrected either with spectacles (n = 2) or with gas-permeable contact lenses (n = 2). There were no surgical flap or corneal graft complications. Conclusions: Hinged lamellar keratotomy improves vision and refraction of postkeratoplasty eyes with high-degree astigmatism. In some cases it may be so effective as to make planned excimer laser treatment unnecessary.