The blades on left-handed scissors are set so that, whichever way up you hold them, the left blade is always on top. This means that the cutting action of the left hand pushes the blades together to give a smooth cut the whole length of the blades and also that a left-hander has a clear view of the cutting line. When a left-hander uses right-handed scissors, they have to push the thumb and index finger together in an unnatural way to make the scissors cut, causing marks on the hand and eventually callouses. Also, they have to look over the top blade, which obscures the cutting line.
With properly designed left-handed scissors these problems do not arise, as your natural cutting action matches that of the scissors. Just hold the scissors straight and naturally and do not try to twist the blades. After a short time, you will be completely comfortable with your new scissors and wonder how you put up with mis-using right-handed scissors for so long! All our scissors are fully left-handed with blades reversed and left hand moulded grips.
With the blades reversed so the left blade is on top, you can see the cutting line and the blades have a proper cutting action when squeezed together. The grips are moulded to fit comfortably around the thumb joint.
The top blade covers the cutting line so you usually end up cutting inside it. The blades are pushed apart by the left handed squeezing movement and the paper bends between the blades. Also, the handle shape is very uncomfortable and leaves marks on the left thumb.
A word of warning! As we have explained, it is not possible to make "ambidextrous scissors", although many manufacturers claim their scissors are "universal" or "suitable for left and right hand use". This only refers to the handles, which have not been moulded to fit the right hand knuckle, but they have no advantage for left-handers whatsoever as the blades are still set right-handed!