If you are suffering from severe ketu dasha then you must wear ketu blessed cat's eye or lehsuniya stone to nullify the ill-effects being created by the severe ketu dasha. Before proceeding any further, let's disclose what does ketu dasha means and why it is considered so dangerous? Since, ketu is acknowledged being the 'shadow planet' by shadow planet we mean a planet which does not have any physical existence, yet, due to its competency to make vital changes in the lives of its wearer it is considered being an important planet.