So here is the reason....

The blindfold is given to students that have problems "chasing the arms" visually and with their own arms. The thinking is that if the students vision is taken away that they will not be effected by obstacles and therefore will develop the correct idea of LSJC using the whole body. Some students that have more courage and are less prone to being scared of incoming limbs may not require it. If the student needs the blindfold he should keep wearing it until the problem is trained away.

Unfortunately people have interpreted blindfold training into trying become sensitive to each others movements through prolonged contact with the arms. The correct idea is not to stick to the arms but attack the center without cowering away from attacks.