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The comparison of intrastromal corneal ring segment implantation in different maximum K value and corneal thickness

Poster Details

First Author: S.Park SOUTH KOREA

Co Author(s):    S. Lee   I. Koh   H. Yang              

Abstract Details


To evaluate the efficacy of intrastromal ring segment (Intacs, Addition Technology, Inc.) implantation and analyze outcomes in different Maximum K value(K max) and corneal thickness.


SU yonsei eye clinic, Seoul, Korea


In this retrospective study, 115 keratoconic eyes of 99 patients who had SK Intacs segment implantation were reviewed. Postoperative examinations were at 1 and 6 months. Patients were grouped arbitrary according to Maximum K value(group A: K max>60D, group B: K max<60D) and corneal thickness (group C: thickness>400㎛, group D thickness<400㎛). Evaluation was included uncorrected visual acuity(UCVA), best corrected visual acuity(BCVA) manifest refraction, slit lamp examination, corneal topography, central corneal thickness(CCT) and IOP


The study evaluated 115 eyes of 99 patients with a mean age of 31.2 years (range 18 to 55 years). The mean UCVA was significantly better 6 months postoperatively than preoperatively (0.14 versus 0.33) (P<0.01), as was the mean BCVA (0.42 versus 0.60) (P<0.01). Other pre- and 6-months postoperative clinical results were: mean SimK 49.36 (D) and 45.37 (P<0.01), respectively; mean K max value, 60.01 D and 55.74 D, respectively (P<0.01); In comparison between patient groups, Group A shows better efficacy than group B(P<0.01) and group D shows better efficacy than group C (P<0.01)


Implantation of ICRS for advanced keratoconus is safe and effective, leading to significant improvement in UCVA, BCVA, Sim K, and K max. Also ICRS is more effective in high maximum K group and thin cornea group

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