The two-year analysis of clinical and functional results of MyoRing implantation in patients with keratoconus

    Adstract

    The two-year analysis of clinical and functional results of MyoRing implantation in patients with keratoconus

    N.P. Pashtayev, N.A. Pozdeyeva, M.V. Sinitsyn

    The Cheboksary Branch of the S. Fyodorov Eye Microsurgery Federal State Institution, Cheboksary;
The Institute of Advanced Medical Training of the Ministry of Health and Social Development of the Chuvash Republic, Cheboksary;
The I. Ulyanov Chuvash State University, Cheboksary

    

    Purpose. A comparative analysis of clinical and functional parameters of the corneal surface in patients with keratoconus (KC) of the stages II, III after MyoRing implantation into the intrastromal pocket formed using the femtosecond laser according to the Pentacam device.

    Material and methods. The surgery was performed in 70 eyes (65 patients) with KC of stages II and III. Depending on the KC stage the patients were divided into 2 groups. The group I consisted of patients with the KC stage II – 41 eyes (38 patients), the group II – patients with the KC stage III – 29 eyes (27 patients).

    The MyoRings were implanted into the intrastromal pocket formed using the femtosecond laser in all patients. Visometry, biomicroscopy with a comprehensive examination of the corneal surface using the Pentacam device were carried out pre- and postoperatively. The follow-up period was 24 months.

    Results. In the group I, the mean value of uncorrected visual acuity (UCVA) 12 months after surgery increased 3.3 times, best corrected visual acuity (BCVA) – 2.3 times. In the group II the UCVA 12 months after surgery increased 10 times, the BCVA – 2.1 times. In both groups, the UCVA and BCVA remained stable throughout the entire follow-up period. In both groups 12 months after surgery an improvement in values of all corneal topography indices, a significant reduction in elevation of the anterior and the posterior corneal surface, a reduction of the distance from the vertex of cornea to its thinnest point, which remained stable throughout the 24 months of the follow-up were noted according to the Pentacam device.

    Conclusion. According to the Pentacam the MyoRing implantation into the intrastromal pocket formed using the femtosecond laser in the follow-up of 24 months showed a significant improvement in both groups of all corneal topography indices, a flattening of the anterior and posterior corneal surfaces, a centering of corneal vertex, that was confirmed by a decrease in the elevation of anterior and posterior corneal surfaces and a centering of its thinnest point and was accompanied by an improvement of refractive indices.

    Key words: keratoconus, MyoRing, femtosecond laser, Pentacam device.

    

    No author has a financial or proprietary interest in any material or method mentioned.