True Ergonomic Left-Handed Mouse Design
In the early days of baseball, left-handed players had to use right-handed gloves. Obviously this put them at a great disadvantage. Later, a glove was designed that had a thumb on each side. This was a glove that could be used by both right and left handed players, but was not ideal for either. It was the premium later placed on left-handed pitching and hitting that led to dedicated left handed gloves. And thankfully, computer ergonomics have made the same leap.
Many manufacturers have designs meant for both left and right handed use. But this, like the baseball glove, is not so ergonomically effective. The best alternative is a specifically designed ergonomic mouse with the left-handed person in mind. And thankfully, there are not many such designs and options.