Oversize donor buttons in corneal transplantation surgery for keratoconus.

The authors report preliminary findings in 34 patients treated with oversize donor buttons for keratoconus. Seventeen patients received oversize donor grafts and 17 received same-size material. A significant increase in myopia was observed in the oversize group when compared with the same-size group, which indicates a trend toward increased corneal curvature in oversized corneal grafts. Oversize material therefore is contraindicated in treating keratoconus.