Confocal microscopy after implantation of intrastromal corneal ring segments☆
Section snippets
Patients and methods
A total of 21 eyes of 11 patients were examined by confocal microscopy (Table 1). In 17 eyes of 10 patients (five male, five female; mean age 32.6 years; range 22–42 years) ICRS were implanted. The untreated fellow eyes of three patients with unilateral implantation served as controls. The mean elapsed time after ICRS implantation was 8.6 months, ranging from 2 to 15 months. The following ICRS thicknesses had been selected, depending on the patients preoperative myopia: 0.30 mm (2×), 0.35 mm
Baseline characteristics
Mean preoperative manifest refraction of the 17 eyes with ICRS was −3.47 sph +0.18 cyl 95° (Power Vector Analysis29), mean spherical equivalent of manifest refraction preoperative was −3.38 D, ranging from −2.0 to −4.75 D. The mean induced refractive change at the time of examination was 2.62 sph +0.4 cyl 83°. Preoperative UCVA was between 20/800 and 20/125. At the time of investigation, all eyes reached a UCVA of 20/32 or better, and 59% (10/17) saw 20/20 or better without correction. Best
Discussion
Because the cornea contributes most to the overall refractive power of the ocular optical system, almost all of the surgical procedures aim to correct low refractive errors by altering the anterior curvature of the cornea. Intrastromal Corneal Ring Segments, or INTACS, recently approved by the Food and Drug Administration, offer some distinct advantages when compared with other refractive procedures such as radial keratotomy, PRK, or LASIK: no surgical alteration at the central visual axis is
Acknowledgements
The authors thank Ao. Univ.-Prof. Mag. Dr. Alois Lametschwandtner from the Institute of Zoology, University of Salzburg, Austria for providing the scanning electron microscopy images of the explanted Intrastromal Corneal Ring Segments.
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