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First Author: C.Pereira PORTUGAL
Co Author(s): M. Franco M. Colaço J. Neves D. Cristivão H. Nogueira H. Prior Filipe
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To compare the real depth of intrastromal corneal ring segments Intacs (ICRSI) with the expected depth value using optical coherence tomography (OCT).?
Institute of Ophthalmology Dr. Gama Pinto, Lisbon, Portugal
This retrospective comparative study comprised 12 eyes of 12 patients with 12 ICRSI for keratoconus.OCT was performed between 47 days and 492 days after implantation. Using anterior segment OCT the shortest distance from the epithelium to the segment at 2 points was measured for each segment. The 2 points are proximal and distal to the incision.?
The mean depth of the 12 segments was 240ḟ35,36 ṁm. The maximal and minimal depths were 305 and 195 ṁm, respectively. The mean depths of the distal and proximal point measurements of all ICRSI were 255ḟ51,43 ṁm and 225ḟ35,55 ṁm, respectively. There was a significant difference between the expected ICRSI depth and the OCT measurements (mean 449,17ḟ20,76 ṁm and 240ḟ35,36 ṁm), respectively.? The position of the distal portions of the ring segments was deeper than that of the portion closer to the insertion site.
The ICRSI actual depth was less than expected. The distal portions ICRSI tended to be placed at a deeper depth. Anterior segment OCT provided precise measurement of ring segment depth and may help identify implants that pose a greater risk for depth-related complications.