After being treated for varicose veins it is important to wear compression stockings to prevent a clot in your deep system as well as help with the treatment and healing process.
It is interesting to note that in some countries, stockings are not even used after some of the minimally invasive treatments.
Here in Australia, most practitioners get their patients to wear stockings.
The duration can be anywhere from 3 days to 2 weeks. Some use it day and night and others advise to use it only during the day.
There is not enough evidence to suggest what is right or what is wrong, but there are multiple benefits and patients generally feel supported with them on.