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Long-term outcome of intrastromal corneal ring segments in keratoconus: five-year follow up

Poster Details

First Author: M.Kang SOUTH KOREA

Co Author(s):    H. Sim   J. Hwang                 

Abstract Details


To evaluate the effectiveness of intrastromal corneal ring segment (ICRS) use in keratoconus after five years.


A retrospective chart review was done.


A total of 30 eyes diagnosed with keratoconus and treated with INTACS (Addition Technology, Sunnyvale, CA, USA) were included. Visual acuity, refraction, indices of corneal irregularity, and higher-order aberration were evaluated at preoperative, two months, one year, three years, and five years postoperatively.


Uncorrected distance visual acuity (UDVA) and spherical and spherical equivalent were improved for three years. However, they worsened at five years to preoperative values. On the other hand, corrected distance visual acuity (CDVA) was improved for five years. Topographic keratometry was flattened, and corneal irregularity indices were improved at five years. Coma RMS was improved continuously for five years.


ICRS has advantages in improving CDVA with topographic stabilization and decreasing coma in keratoconus for five years.

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