PURPOSE: Intrastromal corneal ring segments (ICRS; Intacs) were inserted in a patient with residual myopia of -3.375 D (spherical equivalent) 10 months after laser in situ keratomileusis (LASIK). METHODS: A standard intrastromal corneal ring segment implantation technique was used with the addition of intraoperative ultrasonic pachymetry in 4 quadrants at the 7-mm zone to insure adequate stromal thickness for segment insertion. RESULTS: Four months after ICRS surgery and 14 months after LASIK, the patient had uncorrected visual acuity of 20/20 and a cycloplegic refraction of plano -1.00 x 23 degrees. CONCLUSION: Implantation of intrastromal corneal ring segments in an eye with previous LASIK resulted in additional corneal flattening with a decrease in residual myopia and improved uncorrected visual acuity.

Corneal Stroma↗

PubMedDate not supplied

Should refractive surgeons worry about corneal asphericity?

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Cornea↗

PubMedDate not supplied

The theory of corneal curvature change with the Intrastromal Corneal Ring.

The Intrastromal Corneal Ring (ICR) is a new corneal implant designed to alter anterior corneal curvature. After insertion into the peripheral corneal stroma, the ring may be mechanically expanded or constricted. We constructed a mathematical model to assess the amount of corneal flattening or steepening that might result from ICR expansion or constriction, respectively. The model predicted increased corneal flattening with increasing expansion of the ICR circumference. Progressive corneal steepening with increasing constriction of ICR circumference was predicted. Incremental reductions in initial ring diameter sizes resulted in increased degrees of predicted corneal flattening or steepening. The mathematical model of the ICR function illustrates the potential of the ICR to correct myopia or hyperopia.

Cornea↗