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I found five features to be common in most ergonomically designed scissor handles.

  1. The top hole for the thumb is usually smaller, this keeps the thumb from sliding around and allows the user to have a firmer grip when cutting. I also noted that this hole is not centered over the larger bottom hole, but tends to sit slightly forward from the center.

  2. The bottom hole is larger to accommodate the middle, ring, and pinky fingers.

  3. On the bottom edge of the bottom handle is a slight indent for the index finger to grip onto. This was something I had never thought about before as I naturally assumed that the larger bottom hole was for all fingers other than the thumb. However, the bottom hole is purposefully made to only fit three fingers so that the index finger can support the weight and movement of the scissors cutting from the outside of the handle.

  4. The inner side of the bottom hole is convex for the fingers to grip around.

  5. The top hole is slightly bowl shaped for the thumb to comfortably slide in and apply the normal forces necessary to create the cutting movement as well as to keep it in place. 

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