[Corneal trephining for penetrating keratoplasty: study of the degree of precision and presentation of a new trephine].
The accuracy of corneal trephination with a Franceschetti trephine was investigated on Duragel contact lenses. A modified 7.3 mm Crock trephine (Brit. J. Ophthal. 62 [1978] 74-80) with a rotating diamond blade fitted was compared with the above-mentioned method. Trephination of Duragel lenses from the convex side yielded diameters either larger or smaller than 7 mm. With one exception trephination from the concave side produced disks smaller than 7 mm. All Duragel disks had an elliptical configuration after trephination with the Franceschetti trephine. Trephination with the modified Crock trephine yielded disks with diameters close to 7.3 mm in all meridians.
D016039:Corneal Transplantation; D006801:Humans; D008722:Methods; D013525:Surgical Instruments
Hornhauttrepanation bei perforierender Keratoplastik: Untersuchung über den Grad der (Un-)Genauigkeit und Darstellung eines neuen Trepans.