Free samples of contact lenses are available directly from official websites for brands such as Acuvue and FreshLook. Furthermore, obtain them from eye doctors at clinics and optometry chains such as LensCrafters and Pearle Vision.
Sampling a pair of contact lenses is helpful because lenses differ in terms of material, thickness, color and diameter. Companies offer free lens trials for vision correction and to people who want the cosmetic benefit of colored contacts.
Read the fine print of "free contact lens" ads to avoid surprises. Samples of contact lenses are not entirely free; the customer needs to have a valid contact lens prescription, which requires paying for an eye exam and contact lens fitting. Also, a few manufacturers limit their free trials to in-store sampling; a customer can't wear the lenses home.