Disclosed herein is an assembly of a prescription lens unit and sports-sunglasses. The sports-sunglasses takes the form of goggle type sports-sunglasses including a tinted lens and a sunglass rim, but not limited thereto. The sports-sunglasses is provided with an insert unit, which is fixed to a lower end of the tinted lens and mounted with one or more magnets. The prescription lens unit has a bridge, which is mounted with one or more magnets corresponding to the magnets of the insert unit. With such a configuration, the prescription lens unit is detachably coupled to the sports-sunglasses.