A goggle includes a goggle frame, a lens assembly including a lens mounted on the goggle frame, two reels rotatably mounted on the goggle frame on opposing left and right ends of the lens and a soft sheet mounted between the two reels and abutting the outer surface of the lens, and a control assembly that can be set on one of the two reels according to the dominant hand of the wearer. With this, once the soft sheet is dirty, the wearer operates the control assembly with his dominant hand, so that the control assembly drives the reel set to rotate. At this time, the driven reel will further drive the soft sheet to move laterally relative to the lens, and then roll up the dirty part, so that the soft sheet can always be kept clean in the part corresponding to the lens.