The wearing of watch on the left wrist has practical advantages. Most people are right-handed and while working with the right hand (writing, etc.), the time in the watch on the left hand can be easily seen. Because of lesser movement of the left hand, damage to the watch is also minimised. Even most working women wear the watch on the left wrist. It is only at parties or at times when the right hand is not required to do much work, women wear it on their right wrist as a fashion statement.
—Dipti Jain, Chakradharpur

Source: Time Of India