A New Model Of Icrs For Patients Not Candidates For Lvc Or Phakic Lenses

This study aimed to evaluate the clinical outcomes, topographic changes, and corneal aberrations in patients with Myopia/Astigmatism that are not candidates for laser vision correction (LVC) or phakic lenses treated with a new ICRS model.

Muscat Eye Laser center 

A new model of ICRS, the Keraring SI6 320/400, was implanted on ten eyes of patients with myopia/astigmatism that were not candidates for LVC or phakic lenses. The intrastromal tunnels for the implantation were done using the Ziemer LDV femtosecond laser, and the centration of the tunnel was guided by a 10um PTK on the epithelium of 0.5 mm center on the corneal vertex using the Schwind Amaris 1050RS excimer Laser. Visual acuity, manifest refraction, corneal Scheimpflug, Placido imaging, and corneal wavefront aberrations were measured preoperatively and at 1 and 3 months after surgery. The refractive outcomes, topographic changes, and corneal aberrations were evaluated 3 months after surgery.

Mean postoperative MSEq improved from -7.23 to -0.73D.  83% of the eyes with UDVA within 1 line of preoperative CDVA.  17% of the eyes gained lines of CDVA and none of the eyes lost 2 or more lines of CDVA. The ICRS induce a similar correction of manifest and topographic astigmatism of approximately 3.00D.  The corneal total root-mean-square higher-order aberrations, coma, and spherical aberrations increased compared to preoperative values.

Early results show that Keraring SI6 320/400 effectively and safely significantly decrease the refractive error in patients with moderate to high Myopia/astigmatism, being more effective in the reduction of the sphere. There was an induction of ATR astigmatism in patients with preoperative values of WTR astigmatism below 3.00D