It can also be caused by. 1  chemicals. 2  contact lens wear(https://www.cdc.gov/contactlenses/index.html) (especially wearing lenses overnight) 3  foreign bodies in the eye (like a loose eyelash) 4  indoor and outdoor air pollution caused, for example, by chemical vapors, fumes, smoke, or dust. 5  fungi.
Voluntarism, sometimes referred to as voluntary action, is the principle that individuals are free to choose goals and how to achieve them within the bounds of certain societal and cultural constraints, as opposed to actions that are coerced or predetermined. 1 Volunteerism. 2 Varieties.
Definition of Zionism. : an international movement originally for the establishment of a Jewish national or religious community in Palestine and later for the support of modern Israel.