Intracorneal Asymmetrical Rings for Keratoconus: Where Should the Thicker Segment Be Implanted?

Publisher Website
Google Scholar
Abstract
PURPOSE: To report a 20-year-old man who presented with monocular diplopia in the right eye with uncorrected visual acuity (UCVA) of 0.3 and best spectacle-corrected visual acuity (BSCVA) of 1.0 with -0.50 -3.00 × 45°. METHODS: Clinical examination and corneal topography revealed grade I keratoconus in the right eye. Intracorneal ring segments (INTACS; Addition Technology, Des Plaines, III) were implanted in May 2004 without surgical complications at 415 µm (70% of the corneal thickness), with the 450-µm segment implanted superiorly and the 250-µm segment inferiorly. RESULTS: For 2 months postoperatively, BSCVA remained at 0.4 with +1.50 -4.50 × 25°. The segments were reversed, implanting the 450-µm (thick) segment inferiorly and the 250-µ?? (thin) segment superiorly. One week later, UCVA was 1.0 and remained stable for 3 months after reimplantation. CONCLUSIONS: This report shows that implanting the thicker segment inferiorly provides better visual results. [J Refract Surg. 2006;22:307-309.]