This is an deer iris biopsy, that was mounted on filter paper, to improve orientation and reduce wrinkling of the specimen. A video demonstrating the technique is included (in the video tab). Equipment: filter paper, a thin probe, and a specimen container with formalin. Step 1: cut small pieces out of the filter paper, and moisten it with saline. Step 2: Place the anterior side of the iris down on the filter paper. Then spread the specimen carefully with the probe. Make sure the specimen lies flat. Step 3: Place the iris and filter paper into the specimen container.