Abstract: Various delivery devices and methods are disclosed, including a delivery device (200) for delivering a dose substance (110) in powdered form to an eye. The device can include a pocket (100A, 100B, 100C) for holding dose substance and a propulsion system (202, 204, 908, 1004, 1006) for propelling a dose consisting of a predetermined volume of said dose substance from said pocket towards said eye, wherein one or both of said pocket and said propulsion system are configured to inhibit propulsion of particles having a size greater than a predetermined threshold to said eye.

Abstract: A treatment device and associated methods are disclosed, the treatment device comprising: a fluid dispenser comprising: a sealable reservoir for storing a fluid to be dispensed; a transfer body for carrying a predetermined volume of said fluid from said reservoir to a dispensing point outside of said reservoir; and a sliding seal for maintaining said reservoir in a sealed state while a portion of said transfer body carrying said predetermined volume of fluid and said predetermined volume of fluid are moved from a position inside of said reservoir to said dispensing point outside of said reservoir; and an applicator for applying a predetermined volume of fluid present at said dispensing point to a part of the human or animal body, wherein said applicator comprises means for dispersing said predetermined volume of fluid in a jet of gas directed towards said part of the human or animal body.