1. Half-top-hat a new wound configuration for penetrating keratoplasty

    Aims: To describe a new, simpler method of achieving the advantages of a lamellar wound configuration in penetrating keratoplasty (PKP)—the half-top-hat (HTH) configuration. Methods: The donor corneal button was prepared in a top-hat configuration, as previously described. It consisted of a central, full-thickness part, 7–8 mm in diameter, surrounded by a peripheral lamellar wing of deep stroma and endothelium that was 0.5 mm in width (wing diameter 8–9 mm). The recipient bed was prepared by a straight full thickness trephination with a suction trephine. The donor button was positioned by sliding the peripheral wing under the ...
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