Chu LRI Marker
for a clearly defined pattern without ink!

This instrument was developed by Y. Ralph Chu, MD of Edina, MN to help surgeons create limbal relaxing incisions (LRI) with greater precision.
One of the challenges in this procedure is producing a fine pattern on the cornea so that the surgeon can make an accurate relaxing incision at the limbus. Commonly this is accomplished by applying gentian violet ink to a marker and then imprinting the pattern onto the cornea. Often the ink will smear resulting in blurred lines, thereby reducing accuracy. Dr. Chu worked with Katena to design a new marker with an ultra thin marking surface that can be applied onto a dry cornea, leaving a clean, clear pattern without the use of ink. It features a low-profile degree gauge with a rotatable head for aligning the pattern along the preferred axis as well as an arc imprinted at 10mm with 30°, 45° and 60° landmarks. This arc pattern is easily traceable with a diamond knife helping the surgeon to make very precise and accurate limbal relaxing incisions.