A manually operated dispensing pump is provided for delivering a precise quantity of ophthalmic solution to the surface of the eye in a desired spray pattern with an impact pressure on the eye that is comfortably tolerable by an individual. The dispensing pump basically comprises a push button actuator having a nozzle member disposed therein, a cap member for receiving the push button actuator and having a control ring for selectively limiting the downward travel of the actuator, and a pump chamber engaged in the cap member and in communication with the push-button actuator for pressurizing a metered quantity of ophthalmic solution.

A dispensing pump coupled with a container has a pump body having an end coupled with a button cap. The button cap has a spray nozzle and a pump chamber that contains fluid to be dispensed through the spray nozzle. Inside the pump body is a plunger, a stationary tube with fingers, a biasing member, and a duckbill valve with a slit. When the plunger is in an extended position, the fingers act against the plunger to close the slit of the duckbill valve. As the button cap is depressed, the plunger translates to a depressed position thereby allowing the fingers to spread apart from the duckbill valve and open up the slit such that fluid from the container can fill up the pump chamber. The biasing member urges the plunger back to the extended position, thereby urging the opposed fingers to return to the closed position.