Goggle for protecting eyes with a movable lens and methods for using the goggle
A goggle comprising a lens, a frame, a lens-retention mechanism and an adjustment mechanism wherein the lens can be selectively moved relative to the frame to at least two different positions defining substantially different levels of air flow between the lens and frame while maintaining the lens in front of a user's eyes, and retained at each position. In certain embodiments, one position is defined by substantially all of the lens periphery contacting the frame to substantially form a seal. Other positions are defined by substantially all of the lens periphery not contacting the frame wherein ambient air is allowed to flow uninhibited across the inside surface of the lens. In certain embodiments, the lens-retention mechanism comprises a post and detent, while the adjustment mechanism comprises various mechanisms, for example a rack and pinion, a lever or a rack and pawl that biases the lens to one of the other positions. The adjustment and lens-retention mechanisms may be the same mechanism.