Drop generating device

A method of delivering fluid to an eye of a subject as an ejected stream of droplets, comprising:

• generating the ejected stream of droplets via a droplet generating device, the droplet generating device including an ejector plate, the ejector plate including a plurality of openings formed through its thickness, and a piezoelectric actuator coupled to the ejector plate, the actuator being operable to oscillate the ejector plate at a frequency to thereby generate an ejected stream of droplets;
• wherein the ejected stream of droplets is generated by actuating the piezoelectric actuator to oscillate the ejector plate, the droplets being ejected through the plurality of openings in the ejector plate;
• and
• delivering the ejected stream of droplets to the eye of the subject,
• wherein the ejected stream of droplets have an average ejected droplet diameter of greater than 20 microns and an average initial droplet ejecting velocity of between 0.5 m/s and 20 m/s such that at least about 85% of the mass of the ejected stream of droplets deposit on the eye during use.