A swimming goggles has left and right frames respectively accommodating lenses. A connecting frame is located between the left and the right frames. Head fasteners are respectively connected to outer sides of the left and right frames. Adjusting apparatuses are arranged between the head fasteners and the left and right frames. Each adjusting apparatus has a button with a biasing arm. The biasing arms unilaterally engage/disengage stopping slots of the head fasteners, whereas a user can directly pull the head fasteners to make the head fasteners tighter or press the button to make the head fasteners looser. The swimming goggles can be incrementally adjusted while being worn.

A pair of swimming goggles for swimming pool purposes includes left and right lens frames each of which has a lens unit, a nose bridge connecting inner sides of the left and right lens frames, and a head strap. The nose bridge includes a body portion for touching a wearer's nose, and a guide portion with a first bar and a second bar respectively extending from opposite sides of said body portion. Each of said first bar and said second bar has a parallel section for providing the lens frames to move thereon, and a connection portion connecting the head strap. Thus, the swimming goggles can effectively guard against interference each other during the adjusting and can respectively conform with a wearer's eyehole contour, so as to provide more comfortable fitting and prevent the seepage of water when the swimming goggles are in use.

A pair of swimming goggles of the present invention comprises a pair of left and right lens frames which respectively include an outer surface and an inner surface and receive a pair of lenses, a bridge member disposed at the upper edges of the inner sides of the left and right lens frames, and a head strap means disposed at the outer sides of the left and right lens frames. The feature of the present invention is that the head strap means at least includes a first thread, a second thread, and a pair of adjustment fasteners disposed at the first and second threads, wherein the first thread is disposed at the upper position of the outer sides of the left and right frames, and the second thread is disposed at the lower position of the outer sides of the left and right frames. Thus, the adjustment fasteners properly adjust the first and second threads thereby providing different application lengths for the first and second threads and providing a desired pull force such that the upper and lower edges of the lens frames are adjusted to comfortably contact with the periphery of the eye holes and a desired refraction effect of the lenses in water is achieved.

The invention is a buckle assembly for adjusting length of the band for swimming goggles comprising a buckle body formed with a band support portion onto which a flexible band having a plurality of stop members longitudinally disposed therealong are wound, and a slider connected to the buckle body for slidably moving between a first position and a second position for the band support portion. The slider comprises a band pressing piece which presses and holds the flexible band at a first position thereby one of the flexible band stop members is stopped by the band pressing piece and the slider is moved to a second position when the flexible band is extended by being pulled, and another of the flexible band stop members is stopped by the band pressing piece and the slider moves to a first position when the flexible band is contracted by being released from pulling.