Abstract: A fluent material dispensing system comprising: a bottle, a plunger engaged inside the bottle, and a dispensing mechanism having a lever for operation of the plunger for fluid expulsion. The plunger may frictionally engage the bottle to a degree sufficient for holding the plunger in place against a force applied due to return motion of the lever. The dispensing mechanism may comprise a cap for attachment to an end of the bottle opposite a fluid outlet and a handle attached to the cap, the lever pivotally coupled to the cap, the lever and the handle aligned with the bottle. The dispensing mechanism may comprise a portioning mechanism configured to limit distance travelled by the lever from the rest position to the engaged position to a defined amount, thereby limiting expulsion of the fluid to a corresponding defined portion.

Abstract: The invention provides a head support apparatus. The apparatus may for example be used for ophthalmic examination. In some embodiments, the apparatus may allow six degrees of freedom of motion during initial positioning of a patient's head, and may then be locked to hold the patient's head in place precisely. The head support mechanism may include three shafts connecting an upper frame to a structure. Each shaft may be provided with a ball-and-socket joint at one end and a lockable bearing assembly on the other end. The lockable bearing assembly may provide a combination of sliding and pivotal movement. A biasing assembly may be provided to support each shaft, and to return each shaft to a self-centered and fully lifted rest position. A head clamping apparatus is also disclosed comprising pivoting clamping arms and an adjustable chin rest.