Father-in-law's varicose veins

My father-in-law is quite elderly, and I am worried about whether he should undergo the procedure for his varicose veins.

First, I need to understand the situation in detail, but since there are no people around who have undergone the procedure, I don't know what to do. I would like to hear valuable experiences from those who have had similar experiences. My father-in-law is 86 years old.