Contact lenses aren't always easy to fit. Especially if you are correcting for astigmatism. There's sizing, weighting, permeability and the unmeasured but distinct differences between brands. There's also the choice of changing the actual powers involved for different reasons. So people have to take them away, try them for comfort and such... Three visits is pretty normal. If you are a keratoconic then 3 visits would be a very easy case...