You should not have the Tyndall effect from either "cheek" filler or that to correct hollows, as both should be injected deep. For under eye hollows, the filler should be injected on the bone. The filler should be on the bone in the malar cheek over the bone. Further out, it should be in the superficial fat compartment, still deep enough that you should not get a Tyndall effect. The one exception is where you are trying to correct skin lines or wrinkles and are injecting in the dermis. Even then, you can reduct the chance of having the effect by using the right filler. Make sure you are seeing an expert in use of fillers. Not everyone who claims to be is.