This tag refers to problems with the design of objects which are designed for the right hand but work poorly or do not work at all for left handed people. There are many objects which, by their design, either cannot be held with the left hand, or worse if held with the left, the user's vision is blocked.
A basic example of
this is scissors, most are made for right handed people. When held
with the right, the top blade is behind what is being cut, the bottom
blade underneath. If a left handed person tries to use right handed
scissors, the top blade blocks the view of what is being cut.