Abstract

BENITEZ MERINO, María del Carmen et al. Stromal scaring and corneal re-inervation by using confocal microscopy in Lasik after radial postkeratotomy of 15 years of evolution. Rev Cubana Oftalmol [online]. 2012, vol.25, n.1, pp.48-56. ISSN 0864-2176.

Objective: To describe the morphological alterations in the stromal scaring and re-inervation by using confocal microscopy in patients operated on with LASIK after radial postkeratotomy of 15 years old evolution. Methods: A prospective, longitudinal, observational and descriptive study was conducted in 25 patients (50 corneas) operated on by radial keratotomy, with no further complications and re-operated on with Laser in Situ keratomileusis (SHWIND Esiris). The characteristics of the corneal structures and the regeneration of corneal nervous fibers were studied by means of confocal microscopy with Confoscan S4. Summary measures were used. Results: The stromal scaring was limited on the edge of the flap; there was an increase of the keratocyte activity in the stromal channel during the first weeks of the postoperative period and a decrease of the keratocyte density caused by apoptosis observed up to one year of evolution. Before Lasik, the number of nervous plexuses was normal in more than 80% of the corneas with incisional corneal surgery. In the first 3 postoperative months there was no nervous regeneration; but this process began between 6th and 8th months, with evident alteration of the morphology and quantity of nervous plexuses per field of confocal microscopy a year after surgery. Conclusion: The evolution of the microscopic characteristics of the cornea, which were studied with microscopy confocal in patients operated on by Lasik after radial keratotomy, was similar to that described in patients who had not undergone this type of surgery. The nervous regeneration began after 6 months when nervous nodes and progressive increase of corneal sensitivity occurred.

Keywords : Scaring; reinervation; LASIK; confocal microscopy.

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