Hi Baileysmith123,Restylane has been used longer for tear trough/under eye hollow correction. This is an off-label use for Restylane which is used on-label for smile line correction and lip augmentation. In my experience, Restylane in the lower eyelid area lasts about 12-18 months for my patients, and sometimes longer. When I first starting injecting Restylane in this area, I told patients that it may last 4-6 months since this is typically how long it lasted in the on-label areas which have much more movement. Surprisingly, most of the patients did not come back for about a year or longer, and if they do have a touch up, it is usually half as much filler as they did the first time.Restylane Silk is softer and may not last as long, but since it is recently approved filler only time will tell if it lasts as long as Restylane in this area. Ideally, the filler is injected deeper under the muscle which should prevent it from getting a bluish tinge on the skin. This happens because the skin is very thin in the lower eyelid area, and it is injected between the skin and the muscle. The filler is on top of the muscle so the blue tinge shows through the skin. If the filler is under the muscle, then the muscle is directly under the skin and does not look blue. Restylane Silk and Belotero are designed to be used much closer to the surface of the skin without the skin turning blue (Tyndall effect). But if the injector is injecting the filler above the muscle, in my opinion, this is anatomically incorrect. Whatever fat loss has occurred to cause the under eye hollowing is from fat loss under the muscle, so in my opinion, it makes more sense to add filler in the area where the volume was lost, instead of injecting the filler in a non-anatomic area which did not have fat there originally.Please visit my web reference link below to see an example of lower eyelid filler using Restylane.I hope this makes sense and good luck on your cosmetic journey.Best,Dr. YangP.S. If you find my answers or other doctors answers to questions are helpful, please +1 those answers to push up the better answers to the top, which helps others who read the same post, get to the more helpful answers first.P.P.S. There is a new feature on Realself, which is the "Follow" button. It is similar to the "Like" button on Facebook. If you like my response or any of the doctor responses while you research on Realself, you should "Follow" them. You will get email updates, when the doctors you follow post any new answers to questions, post new photos, or have any new reviews.