A power device for visual care includes a circuit control fixed with a pneumatic cylinder. The circuit control panel includes a homing sensor, a positive air pressure micro switch and a negative air pressure micro switch respectively correspond to the homing position, the utmost positive air pressure position and the utmost negative air pressure position of a piston unit. The circuit control panel further includes a guide member with an inductive part. Accordingly, when the power unit is activated, a power screw drives the piston unit to bring the inductive part of the guide member to the homing sensor for return-to-zero setting, and to bring it to touch the positive air pressure micro switch and the negative air pressure micro switch so as to provide proper positive air pressure and negative air pressure for visual care.
