Intrastromal corneal ring in penetrating keratoplasty: Evidence-based update 4 years after implantation

Advantages of the ISCR were observed outside the targeted goals of improving the amount of astigmatism and maintaining refractive stability. Best corrected visual acuity and cylinder development were similar in Groups 1 and 2, whereas, there was a highly reduced immune rejection rate. The ring also appeared to act as a barrier to superficial vessels.