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ISSN 1561-3070 (Electronic)

2013, Number 1

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Rev Cub Oftal 2013; 26 (1)

Conic corneal trephination as a new cutting profile for penetrating and anterior lamellar keratoplasties

Capote CA, Cárdenas DT, Cruz ID, Hernández LI, Vinardell PS, Ravelo VW

Language: Spanish
References: 27
Page: 15-29
PDF size: 898.03 Kb.


ABSTRACT

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 µm and the mean corneal thickness at the cutting point was 850.0 ± 119.2 µm , being the difference between them equals to 926 µm. 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.


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