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Revista Cubana de Oftalmología

Print version ISSN 0864-2176

Abstract

CAPOTE CABRERA, Armando et al. Conic corneal trephination as a new cutting profile for penetrating and anterior lamellar keratoplasties. Rev Cubana Oftalmol [online]. 2013, vol.26, n.1, pp.15-29. ISSN 0864-2176.

Objectives: to describe the characteristics and use of the conic corneal trephination. Methods: an experimental study was performed in "Ramón Pando Ferrer" Cuban Institute of Ophthalmology from January to December 2010. Ten eyeballs not useful for transplantation underwent trephination, with a corneal vacuum trephine particularly designed to create an oblique corneal cut. The cutting length, the corneal thickness, the external diameter of the disc, the internal diameter of the disc and the cutting angle were the analyzed parameters. Descriptive statistics were applied to show the results. Results: the mean cutting length was 1776.7 ± 273.7 mm and the mean corneal thickness at the cutting point was 850.0 ± 119.2 mm , being the difference between them equals to 926 mm. The mean external diameter was 7.6 ± 0.2 mm and the internal diameter was 8.5 ± 0.4 mm, with a difference of 0.9 mm. The mean cutting angle amounted to 28.4 ± 2.1°. A formula was developed to calculate the cutting length or depth based on the mean pachymetry of the circle where the trephination is performed for a determined cutting angle. Conclusions: aregular symmetric cut was obtained, longer than the corneal thickness with the planned conic profile. Such cutting pattern provides a larger contact surface and self-sealing tendency.

Keywords : keratoplasty; cutting angle; conical trephination.

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