2020–2021 BCSC Basic and Clinical Science Course™
13 Refractive Surgery
Chapter 4: Onlays and Inlays
Intrastromal Corneal Ring Segments
Other Considerations With Intrastromal Corneal Ring Segments and LASIK
Corneal ring segments have been used to correct residual myopia following LASIK with good initial results. In such cases, a nomogram adjustment is necessary to reduce the risk of overcorrection. This procedure may be useful in patients whose stromal bed is not sufficient to support a second excimer laser ablation.
Conversely, after ring segments have been removed from patients whose vision did not improve satisfactorily (eg, due to undercorrection or induced astigmatism), LASIK has been performed with good success. The flap is created in a plane superficial to the previous ring segment channel.
Excerpted from BCSC 2020-2021 series: Section 13 - Refractive Surgery. For more information and to purchase the entire series, please visit https://www.aao.org/bcsc.