full-ring intrastromal implantation in correction of high myopia in severe keratoconic eyes

the aim of this study was to evaluate the effect of mechanical implantation of myoring in keratoconic patients with high myopia. this study comprised 32 eyes of 32 keratoconic patients (14 males, 18 females) with high myopia. all underwent myoring (dioptex gmbh) implantation using mechanical dissection with a pocket maker microkeratome and completed three months of follow-up. the main outcome measures of the study were p reoperative and postoperative uncorrected distance visual acuity (udva), corrected distance visual acuity (cdva), manifest refraction, and keratometry readings. the mean age of patients was 29.6 ± 6.7years (range 20–44 years). a significant diference was seen in the spherical equivalent refractive error when compared final postoperative examination to preoperative one (-10.51 ± 2.81 d to -1.32 ± 2.29 d) (p˂0.001). the mean udva (log mar) improved significantly from 1.14 ± 0.32 to 0.35 ± 0.24 (p˂0.001) and the mean cdva (log mar) improved from 0.47 ± 0.20 to 0.22 ± 0.15 (p˂0.001) postoperatively. the mean of sphere and cylinder of manifest refraction was reduced significantly by 7.70 and 2.6 diopters (d) respectively (p< 0.001). furthermore, in regard to corneal topography, a significant reduction in the mean keratometry (k) reading was observed. the mean k reading had decreased by 3.55d  (p˂0.001)  at the final follow-up. the outcomes of the study showed that myoring is quite effective for correction of myopia in keratoconic patients with high myopia.