Incision depth vs. incision number in the rupture strength of pig eyes following radial keratotomy
Kung, J.S.; Lucca, J.A.; Santamaria, J.
Journal of Refractive Surgery 12(2): S294-S296
ISSN/ISBN: 1081-597X PMID: 8653515 Accession: 046372281
The effects of incision depth and the number of incisions on globe rupture were studied in porcine enucleated eye model. In one group, radial keratotomy was performed using a diamond blade set at 100%, 75%, and 50% of corneal thickness. In another set of eyes, 16, 8, and 4 incisions were made with the diamond knife set at 100% of corneal thickness. The eyes were then subjected to blunt trauma. The mean energy of globe rupture for incisions at 100%, 75%, and 50% of corneal thickness was 3.0, 4.2, and 4.6 joules respectively. In contrast, mean energy of globe rupture for 16, 8, and 4 incisions at 100% corneal thickness was 2.8, 2.9, and 3.0 joules, respectively. This study suggests that incision depth in radial keratotomy reduces the strength of the cornea more than incision number.