How does [Referral Program] work? A How does [Referral Program] work? When you refer our website to your friends and family through the [Referral Program] under [My Account], you both will receive 20% off when your friend makes their first purchase from us! Click here to find out more. Masa Can I buy coloured contact lenses without a prescription if I don’t require eyesight correction? What is the difference in left and right lenses?