Yeah... you are right... it is the heart... the heart is more
flexible than you think hisoka... 
It
can accomodate almost into any shape based on the amount of blood
in it. It can shrink, it can be shoe shaped, it can be huge, it can
even be pancaked... Much more flexible than what kikq was thinking
of...
Astigmatism, what I know is that there is a visual defect caused by
unequal curving of one or more of the refractive surfaces of the
cornea, hence preventing light rays lying in certain planes from
coming to a focus point on the retina. This leads to a blurry
vision. Commonly associated with far or short sightedness...
More information:- http://www.allaboutvision.com/conditions/astigmatism.htm
