I have varicose veines. I made an ecodoplar and my doctor recommended treatment by laser. Is this treatment efficient?

Yes. Laser ablation of incompetent (leaking) veins reroutes the venous drainage into healthy veins. This decreases the pressure in the skin veins back to normal and reverses the symptoms. We have used laser ablation in over 13000 cases with excellent results and few complications.
Maybe. If the varicosities are of sufficient size, are associated with venous reflux, and contribute to peripheral edema, then i would recommend consulting a vascular surgeon who does radiofrequency ablation.