A crescent blade is designed to dissect scleral or corneal lamellar flaps at a consistent depth. The Stegmann MicroCrescent is small and facile, while the Ahmed SuperCrescent is large and features more tactile feedback.
Ahmed SuperCrescent, Stegmann MicroCrescent
The Stegmann MicroCrescent is considered by many to be the ultimate planar dissection blade. The diamond is Stealth faceted (big bevels down), so dissections tend to maintain the plane rather than diving deeper. The very fine, crescent shaped tip (.75 mm) can be wielded to perform practically any dissection.
The Ahmed SuperCrescent is a very efficient crescent-style diamond. Featuring a broad, 1.4 mm leading edge with three facets, the Ahmed SuperCrescent delivers one of the finest dissecting edges available. The long cutting sides provide the ability to enlarge any incision and provide better stability during flap creation in terms of maintaining the plane of dissection due to the broader nose geometry.
The President Series handle features a double threaded mechanism for robust, simple actuation. The mechanism locks securely to eliminate free play of the stylus. The titanium construction and elimination of springs makes them virtually indestructible in clinical service. The President serves as the platform for phaco keratomes, paracentesis blades, glaucoma blades, groovers and any freehand application. The diamond is extended straight or at an angle for maximum clearance and accessibility.
Video by Professor Robert Stegmann
"The Opening Determines the Close"
Histological and ultrastructural study of corneal tunnel incisions using diamond and steel keratomes
“The corneal incisions made with the dissecting, stiletto-like keratomes (Mastel Fine Triamond) were distinct from the other incisions, having a smoother stromal surface and much less disruption of stromal tissue. The dissecting incision using the stiletto-like diamond keratomes was ideal with respect to the degree of disruption of stromal tissue.”
Journal of Cataract and Refractive Surgery, Volume 24, Number 4, April 1998
Jacobi et. al., Giessen University, Munich, Germany, Pages 498-502