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Ashley Behrens, MD; Kenneth Ellis, MD; Li Li, MD; Paula M. Sweet, MT; Roy S. Chuck, MD, PhD

Arch Ophthalmol. 2003;121:503-508.

Objective  To compare postoperative astigmatic change and graft stability using 2 different donor button diameters in endothelial lamellar keratoplasty to treat corneal endothelial failure.

Methods  A 200-µm-thick corneal flap keratectomy was performed in human donor corneoscleral rims (n = 20; 10 donors and 10 recipients) using an artificial anterior chamber and a manual microkeratome (ALTK System; Moria USA, Doylestown, Pa). After flap reflection, stromal bed trephination was performed to obtain a disc consisting of posterior stroma, Descemet membrane, and endothelium. Host beds of 7.0 mm and 7.25-mm (n = 5) or 7.50-mm (n = 5) donor buttons were obtained using a freehand trephine. The graft was secured with 8 interrupted sutures (10-0 nylon) in the stromal bed. The flap was sutured with 3 interrupted sutures. Transplanted corneas were submitted to increasing intrachamber pressures to detect graft stability, and preoperative and postoperative videokeratographic data were recorded to assess astigmatic change.

Results  The mean (SD) postoperative astigmatic change was 1.14 (3.17) diopters (D) in the 7.25-mm donor button group and 2.27 (1.77) D in the 7.50-mm donor button group (P = .69). Mean (SD) resisted pressures of 75.4 (44.81) mm Hg and 100.4 (46.86) mm Hg were observed in the 7.25-mm and 7.50-mm groups, respectively (P = .54).

Conclusion  Both donor button sizes exhibited similar graft stability and astigmatic postoperative change in this experimental model.

Clinical Relevance  As endothelial lamellar keratoplasty becomes further developed as a clinical alternative to penetrating keratoplasty, this laboratory model system should be useful in evaluating different mechanical factors that contribute to graft success.

From the Departments of Biomedical Engineering (Dr Chuck) and Ophthalmology (Drs Behrens, Ellis, Li, and Chuck and Ms Sweet), University of California, Irvine. The authors have no relevant financial interest in this article.

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