MC5619 is a model that sells very well every year. The lens connection adopts an assembled design, so that if the distance between the lenses is too far for the user, it can be adjusted to ensure usage. At the same time, the lenses adopt electroplating anti-fog technology, which can not only prevent the lenses from fogging up but also block ultraviolet rays to protect the users. The strap can also be adjusted through the strap regulator on the frame.