A tool-less connector with multiple contacts and a compact design is provided. In the case of no demand from the consumer, hydraulic fluid flows from the pumps through the pressure balance circuit and to tank. The connector portion is provided such that one of the terminal pieces is directly coupled to the motor. In this case, when the movement speed is slow, the pilot signal measurement time length is set short, and the inner threshold value is set small, and when the movement speed is fast, the pilot signal measurement time length is set long, and the inner threshold value is set large. The ophthalmic composition will have an osmolality of from 200 mOsmolkg to 420 mOsmolkg.