Swimming goggles with step-less adjustment

A type of swimming goggles with step-less adjustment comprising:

• two lens frames that each receive a lens, each of said lens frames including a first joining unit located at an inside edge of said corresponding lens frame, and a second joining unit located on an outside edge of said corresponding lens frame, and each of said two lens frames having a clasp piece extending along an upper rim and a lower rim of each lens frame to form fixing grooves,
• a first string passing through said second joining unit of one of said lens frames, along the upper rim of said one of said lens frames and being secured in said corresponding clasp piece, through said first joining units, along the upper rim of the other of said lens frames and being secured in said corresponding clasp piece, and through said second joining unit of said other of said lens frames so as to maintain a desired separation distance between said two lens frames, said first string extending past said lens frames so that ends of said first string are exposed,
• a second string passing through said second joining unit of said one of said lens frames, along the lower rim of said one of said lens frames and being secured in said clasp piece, through said first joining units, along the lower rim of said other of said lens frames and being secured in said corresponding clasp piece, and through said second joining unit of said other of said lens frames so as to maintain a desired separation distance between said two lens frames, said each string extending past said lens frames so that ends of said second string are exposed, and
• a headband device joined to said second joining units, said headband device comprising at least a headband;
• wherein
• each said first joining unit includes two through holes, and each said second joining unit includes two engaging holes with clasp openings;
• and wherein
• each string has a diameter less than the diameters of the through holes and the engaging holes to facilitate easier adjustment of the strings.