When you go to choose interchangeable lenses sunglasses, make sure they offer 100% UV protection to protect your eyes from harmful UV rays. As for the lenses, make sure they are of high quality and have no distortions, otherwise you will get eye fatigue if they cause distortions. When considering the frames, you'd better choose loghtweight frames that are made of durable material such as titanium. The most important one is that they must be comfortable to wear.
The same as choose common sunglasses, you shall judge interchangeable lenses sunglasses from three parts: sunglasses lenses, sunglasses frames as well as nose pad. To get comfortable wearing, you shall choose sunglasses lenses that have high quality and free of distortions, As for frames, you'd better choose lightweight frames that made of durable materials. Besides, you'd better choose glasses frames with nose pad so as to adjust yourself in case you feel uncomfortable.