A scleral marker with additional uses.
We use a scleral marking pen to indicate the position of a retinal break. Although its primary purpose is to mark the localizing impression of the cryosurgical probe, the pen can be modified to serve as a localizer, as a measuring device, and as a buckle simulator.
D003452:Cryosurgery / Q000295:instrumentation*; D006801:Humans; D012163:Retinal Detachment / Q000601:surgery*; D012590:Sclera