Convenient and inexpensive
Convenient because you can change the sunglasses and so benefit more pairs in one. less expensive solution than sports glasses to view. Beware the astigmatism because the clip being mobile, it is very difficult to position always in the same way.
Intuitive assembly. Not easy to install, you have to try a few times.
Shimano optical clip rx
Good product and necessary for models that support optical glasses graduation,