The main three advantages of Intracorneal Ring Segments are as follows:
1. High accuracy in correcting myopia, at least equal to that of LASIK surgery. According to the FDA (Food and Drug Administration) study, the postoperative outcomes have been observed: in 55% of the patients visual acuity was improved more than 16/20 after 2 years, in 75% of the patients more than 20/20, in 91% of the patients more than 25/20 and in 95% of the patients visual acuity was improved more than 40/20.
2. No tissue changes in the central cornea and maintaining the normal corneal shape
3. The ability to revert to preoperative status in case of removing intracorneal ring segments.
Note: In ICRS implantation, there is no need for complicated microkeratome and laser technologies such as those used in LASIK, and in this regard, it is considered as a special treatment in the developing countries.
Note: The results of the surgery are different in patients with keratoconus and myopia. Implanting ring segments improves visual acuity by two lines on average in 50% of patients, although some patients may achieve more improvement. In fact, in patients with keratoconus who don’t have a good vision with glasses before the surgery, ICRS implantation reduces corneal irregularities that along with new prescription eyeglasses results in a better vision.
Limitations of ICRS Implantation
The only present problem with the implantation of intracorneal ring segments is its limited range of patients who are proper candidates for this procedure. In other words, patients with myopia from -1 to -4.5 diopters and a maximum astigmatism of 1 diopter can be treated with this technique.
Other Uses of ICRS Implantation are as follows:
-The correction of residual refractive errors after LASIK
-The correction of keratoconus More guides and complete information are provided for patients by the eye care team of Tehran Noor Eye Hospital in Iran.