Special omnidirectional mobile base with wheels to easily move ophthalmic chairs. Allows to move the chair in any direction. Very usefull to visit disabled patients with wheelchair. Rotating of 90° the lever on the back, the base raises from the floor allowing to move the chair in any position. The Base is complete of electric raising system and can be applied to the following chairs: 88HE, 88KA, 88AD, 88MC, 88NE.