Special omnidirectional mobile base with wheels to easily move ophthalmic chairs. Allow to move the chair in any direction. Very usefull for disabled patients with wheelchair. Pushing the button UP the base raises some mm and is possible to move the chair in any wished position. Pushing the button DOWN, the base goes down in stable position on the floor. The Base is complete of electric raising system and can be applied to the following chairs: 88HE, 88KA, 88AD, 88MC, 88NE.